From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 609FA2D1303; Tue, 28 Apr 2026 01:34:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340070; cv=none; b=jaL7ByWwuXCpB9xHMX+c7Itl+Uru7SUsomujv9Wp0h+pgA2UrAEihyNr8VxmErLxNwB2Z7ZP2oHM/Qjl6huqEwhXcQPiY2/bEOhM3EjtvXs4103tbvw+2+yYOex4KKs+9jnSVvkoz7pFjVJvNG54TeeUGxVMnPPg4SdZZnSbJBo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340070; c=relaxed/simple; bh=CbuuRamb/kBQi30M9xcMQJVCapHdXjhxNpZwhqf9TZk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YaMaMod/ZmgXKcDY1mkhksL9NPhN2/XpyW4+FAl0quxB7B1GhAXNB8wdP94t2ZF8ehizQNkfBg1yRWp4uHenPjkCYKWq9PwYpqU+W+RJY473QfG3NytmMWOZzW45thhPR0Z109tEjmXXiNN5W7V0nC28N46Q4eDArpSElicSdVs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=omaAhUye; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="omaAhUye" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE879C2BCB9; Tue, 28 Apr 2026 01:34:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340070; bh=CbuuRamb/kBQi30M9xcMQJVCapHdXjhxNpZwhqf9TZk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=omaAhUyegFAJx3SDDZ9s6uKHSs/OVhumd7gScii7OT1kQ86yFeNfP5NwgoHvIi0Dt XSPF8wfv0S6k4KUlhaggo5kuqmaygpeNULxi/ncPJvGr90Xp5gHBZweo6qHTrhfQf5 MrzZ5BI3Wlk9Z2GZrc0czpa4kR/MwTjcwdlSBuTsqUDFOIN4UBX6W73zRd5eZo2DvP oE/lUwrLarSIlVJ3NAmzIsnKbmVuFO34UzAWcT89kd7lRAwO+KtLAUhpDkUV89zUD8 Q2peGg4FMIeuO5NtZ4h0VRVGL0F68DzRi0CmCmPZrmsfLCv8MgZW/SQFvGB8FClP95 viYG76miNhlPg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 01/11] mm/damon/core: handle X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Less than min_region_sz remaining quota effectively means the quota is fully charged. In other words, no remaining quota. This is because DAMOS actions are applied in the region granularity, and each region should have min_region_sz or larger size. However the existing fully charged quota check, which is also used for setting charge_target_from and charge_addr_from of the quota, is not aware of the case. For the reason, charge_target_from and charge_addr_from of the quota will not be updated in the case. This can result in DAMOS action being applied more frequently to a specific area of the memory. The case is unreal because quota charging is also made in the region granularity. It could be changed in future, though. Actually, the following commit will make the change, by allowing users to set arbitrary quota charging ratio for action-failed regions. To be prepared for the change, update the fully charged quota checks to treat having less than min_region_sz remaining quota as fully charged. Signed-off-by: SeongJae Park --- mm/damon/core.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 278594847cf94..888b6ac29feff 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2047,6 +2047,20 @@ static void damos_walk_cancel(struct damon_ctx *ctx) mutex_unlock(&ctx->walk_control_lock); } =20 +static bool damos_quota_is_full(struct damos_quota *quota, + unsigned long min_region_sz) +{ + if (!damos_quota_is_set(quota)) + return false; + if (quota->charged_sz >=3D quota->esz) + return true; + /* + * DAMOS action is applied per region, so esz - quota->charged_sz < min_region_sz; +} + static void damos_apply_scheme(struct damon_ctx *c, struct damon_target *t, struct damon_region *r, struct damos *s) { @@ -2104,8 +2118,7 @@ static void damos_apply_scheme(struct damon_ctx *c, s= truct damon_target *t, quota->total_charged_ns +=3D timespec64_to_ns(&end) - timespec64_to_ns(&begin); quota->charged_sz +=3D sz; - if (damos_quota_is_set(quota) && - quota->charged_sz >=3D quota->esz) { + if (damos_quota_is_full(quota, c->min_region_sz)) { quota->charge_target_from =3D t; quota->charge_addr_from =3D r->ar.end + 1; } @@ -2133,8 +2146,7 @@ static void damon_do_apply_schemes(struct damon_ctx *= c, continue; =20 /* Check the quota */ - if (damos_quota_is_set(quota) && - quota->charged_sz >=3D quota->esz) + if (damos_quota_is_full(quota, c->min_region_sz)) continue; =20 if (damos_skip_charged_region(t, r, s, c->min_region_sz)) @@ -2460,8 +2472,7 @@ static void damos_adjust_quota(struct damon_ctx *c, s= truct damos *s) if (!time_in_range_open(jiffies, quota->charged_from, quota->charged_from + msecs_to_jiffies(quota->reset_interval))) { - if (damos_quota_is_set(quota) && - quota->charged_sz >=3D quota->esz) + if (damos_quota_is_full(quota, c->min_region_sz)) s->stat.qt_exceeds++; quota->total_charged_sz +=3D quota->charged_sz; quota->charged_from =3D jiffies; --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8B8922D7804; Tue, 28 Apr 2026 01:34:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340070; cv=none; b=H/6M7rX+TWqQXw1yJSJjR1HB7bgpw0bO/tnYQMBsBak+EocLaGN7ILio/t9IDDpa99tcAEhSIgjPmc9gXUwQULfxXUJc6M/7H8TuNaGqoQAfXod2tyfUPMGjZbWawan4/hQlnpLQFRJ90E/W7pm8uMhv/NGyMYvyW9ZeESqgu+s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340070; c=relaxed/simple; bh=pId4SoTQNM9qN5MUX4PnLv1gsuVQ5SK5VnLsAsG+C5k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ICubmbRyQ44W95hdetraP1aGYOmSNBZf396Os6lLysK1HKJpaD1zn9wgoPgLx0PfHE0znvj/LkI7fMUpShZ0bMlN3Q6YxUmeUP6hz0QR8AJrQcPcKfW9bpuZKnsOJTFXGtlxDepU85ypwrDLLlBkq1NY6vrevl+2WL8ghv2QXqo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HfFQDI6Y; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HfFQDI6Y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 40E8BC2BCB8; Tue, 28 Apr 2026 01:34:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340070; bh=pId4SoTQNM9qN5MUX4PnLv1gsuVQ5SK5VnLsAsG+C5k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HfFQDI6YTDzLPS/XP/FMb3x24PrEVecSxF9Rdf997bheRPoY/CqhmqbBuKnZsyOz2 hyDhsmyG+eeo+DLKpfQ5qBlMuWo/9d9HdortkC5O0vjJ/oDdYYHLqfuy5Pm19PT6Rz lwcY1YlQWCtcn5CxTLvQcCOzpdygM5c9IpwbR2m22C3sLi19KIQzP+ziQXwE2gqSrO SHrjTe+/ycFWPZ0HpMVTcP66dtQg7q2GOpw6JKJ7MWTb2vNwZ9PxJEYAJXzibsDRcR ZPzGAQ3CNCgEB3Grj2Scdr0T/TcX8UbXG856YnI/FbnO513gt66a7HwmETNEOamu2T FH4odM3OvoOmQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 02/11] mm/damon/core: merge regions after applying DAMOS schemes Date: Mon, 27 Apr 2026 18:33:51 -0700 Message-ID: <20260428013402.115171-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" damos_apply_scheme() could split the given region if applying the scheme's action to the entire region can result in violating the quota-set upper limit. Keeping regions that are created by such split operations is unnecessary overhead. The overhead would be negligible in the common case because such split operations could happen only up to the number of installed schemes per scheme apply interval. The following commit could make the impact larger, though. The following commit will allow the action-failed region to be charged in a different ratio. If both the ratio and the remaining quota is quite small while the region to apply the scheme is quite large and the action is nearly always failing, a high number of split operations could happen. Remove the unnecessary overhead by merging regions after applying schemes is done for each region. The merge operation is made only if it will not lose monitoring information and keep min_nr_regions constraint. In the worst case, the max_nr_regions could still be violated until the next per-aggregation interval merge operation is made. Signed-off-by: SeongJae Park --- mm/damon/core.c | 59 +++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 55 insertions(+), 4 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 888b6ac29feff..8e1e19611c387 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2164,6 +2164,58 @@ static void damon_do_apply_schemes(struct damon_ctx = *c, } } =20 +/* + * damos_apply_target() - Apply DAMOS schemes to a given target. + * @c: monitoring context to apply its DAMOS schemes to.. + * @t: monitoring target to apply the schemes to. + * @max_region_sz: maximum region size for @c. + * + * This function could split regions for keeping the quota. To minimize + * overhead from the split operations increased number of regions, this + * function will also merge regions after the schemes applying attempt is = done, + * for each region. The merge operation is made only when it doesn't lose= the + * monitoring information and not violating @max_region_sz. + * + * Hence, after this function is called, the total number of regions could + * be increased or reduced. The increase could make max_nr_regions tempor= arily + * be violated, until the next per-aggregation interval regions merge oper= ation + * is executed. The decrease will not violate min_nr_regions though, sinc= e it + * keeps @max_region_sz. + */ +static void damos_apply_target(struct damon_ctx *c, struct damon_target *t, + unsigned long max_region_sz) +{ + struct damon_region *r; + + damon_for_each_region(r, t) { + struct damon_region *prev_r; + + damon_do_apply_schemes(c, t, r); + /* + * damon_do_apply_scheems() could split the region for the + * quota. Keeping the new slices is an overhead. Merge back + * the slices into the previous region if it doesn't lose any + * information and not violating the max_region_sz. + */ + if (damon_first_region(t) =3D=3D r) + continue; + prev_r =3D damon_prev_region(r); + if (prev_r->ar.end !=3D r->ar.start) + continue; + if (prev_r->age !=3D r->age) + continue; + if (prev_r->last_nr_accesses !=3D r->last_nr_accesses) + continue; + if (prev_r->nr_accesses !=3D r->nr_accesses) + continue; + if (r->ar.end - prev_r->ar.start > max_region_sz) + continue; + prev_r->ar.end =3D r->ar.end; + damon_destroy_region(r, t); + r =3D prev_r; + } +} + /* * damon_feed_loop_next_input() - get next input to achieve a target score. * @last_input The last input. @@ -2533,9 +2585,9 @@ static void damos_trace_stat(struct damon_ctx *c, str= uct damos *s) static void kdamond_apply_schemes(struct damon_ctx *c) { struct damon_target *t; - struct damon_region *r; struct damos *s; bool has_schemes_to_apply =3D false; + unsigned long max_region_sz; =20 damon_for_each_scheme(s, c) { if (time_before(c->passed_sample_intervals, s->next_apply_sis)) @@ -2552,13 +2604,12 @@ static void kdamond_apply_schemes(struct damon_ctx = *c) if (!has_schemes_to_apply) return; =20 + max_region_sz =3D damon_region_sz_limit(c); mutex_lock(&c->walk_control_lock); damon_for_each_target(t, c) { if (c->ops.target_valid && c->ops.target_valid(t) =3D=3D false) continue; - - damon_for_each_region(r, t) - damon_do_apply_schemes(c, t, r); + damos_apply_target(c, t, max_region_sz); } =20 damon_for_each_scheme(s, c) { --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DB7EF2D879E; Tue, 28 Apr 2026 01:34:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340070; cv=none; b=J3+Noyv3Dzpayf57s61IlXnjPOG8Q6gwHHz0eNXiMbsibBBdWTbe9rD1+Mz5iiAp6OSuvLBqWu4Mu3WCJwHtIoMb9HfETc70NBzB4cMgzKOZXH8oKHvotYlnMLfQ6ud5bRC9Q/ZumEN26764IipYJ4eo0cgR9spU8e9herwb794= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340070; c=relaxed/simple; bh=oUVSmzA1QnUOhVFyi70XbY1RxoyA2hU186/ok/tQ2C4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IjOdCzsA4rBC1ZAZHnUn8tY4LV125ocHZ5apE0dl6FltFKScQGipFOgP+B7/R37zeb5t49uwH7Ml/DaZwZjneXdNzCNRQ+M2z0guJyfnAffUY/iPTglM3knuJtKASghtW0u0dZbb8HBLD6PVn0v4lFUmRVi3hKNxnhrrIsRwRWc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pZnje0PN; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pZnje0PN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 96FD0C2BCB7; Tue, 28 Apr 2026 01:34:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340070; bh=oUVSmzA1QnUOhVFyi70XbY1RxoyA2hU186/ok/tQ2C4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pZnje0PNOJUjxyLt6qxARKQQ7kOtrUjKBO5YFGVBiieSLjylDO59j9Y2+17irktFP 2w1DLbbVQv4BgyR4rD2C6aSd7IbV1NSA6vpWgfKAXjGrlWj8zhjjgCXbtO1gMCkk8f eJm+nzo+ioEySefRXBGJye/xjwQLeHIGVMhxLI2VM78j88Ku+RJbYiBBsjao0eqyc9 H1iKh5Ijj1nRvKpHR5KA1YcDkeSDUCL/g4biC2+uGsGJWtG/wkmp97LwZCyrdqywEy 3zb78YD/Z6+fVY0MPXAiMYE4O5T6nUSyURKJoF29kEP/NtQilnaxoYB1jA4gsS9tJ5 nKbx40LQ3pEGg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 03/11] mm/damon/core: introduce failed region quota charge ratio Date: Mon, 27 Apr 2026 18:33:52 -0700 Message-ID: <20260428013402.115171-4-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" DAMOS quota is charged to all DAMOS action application attempted memory, regardless of how much of the memory the action was successful and failed. This makes understanding quota behavior without DAMOS stat but only with end level metrics (e.g., increased amount of free memory for DAMOS_PAGEOUT action) difficult. Also, charging action-failed memory same as action-successful memory is somewhat unfair, as successful action application will induce more overhead in most cases. Introduce DAMON core API for setting the charge ratio for such action-failed memory. It allows API callers to specify the ratio in a flexible way, by setting the numerator and the denominator. Signed-off-by: SeongJae Park --- include/linux/damon.h | 9 +++++++++ mm/damon/core.c | 21 ++++++++++++++++++++- 2 files changed, 29 insertions(+), 1 deletion(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index d3054af1d964f..5fb1dc585658b 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -235,6 +235,8 @@ enum damos_quota_goal_tuner { * @goals: Head of quota tuning goals (&damos_quota_goal) list. * @goal_tuner: Goal-based @esz tuning algorithm to use. * @esz: Effective size quota in bytes. + * @fail_charge_num: Failed regions charge rate numerator. + * @fail_charge_denom: Failed regions charge rate denominator. * * @weight_sz: Weight of the region's size for prioritization. * @weight_nr_accesses: Weight of the region's nr_accesses for prioritizat= ion. @@ -264,6 +266,10 @@ enum damos_quota_goal_tuner { * * The resulting effective size quota in bytes is set to @esz. * + * For DAMOS action applying failed amount of regions, charging those same= to + * those that the action has successfully applied may be unfair. For the + * reason, 'the size * @fail_charge_num / @fail_charge_denom' is charged. + * * For selecting regions within the quota, DAMON prioritizes current schem= e's * target memory regions using the &struct damon_operations->get_scheme_sc= ore. * You could customize the prioritization logic by setting &weight_sz, @@ -278,6 +284,9 @@ struct damos_quota { enum damos_quota_goal_tuner goal_tuner; unsigned long esz; =20 + unsigned int fail_charge_num; + unsigned int fail_charge_denom; + unsigned int weight_sz; unsigned int weight_nr_accesses; unsigned int weight_age; diff --git a/mm/damon/core.c b/mm/damon/core.c index 8e1e19611c387..b20544314ba55 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -918,6 +918,8 @@ static int damos_commit_quota(struct damos_quota *dst, = struct damos_quota *src) if (err) return err; dst->goal_tuner =3D src->goal_tuner; + dst->fail_charge_num =3D src->fail_charge_num; + dst->fail_charge_denom =3D src->fail_charge_denom; dst->weight_sz =3D src->weight_sz; dst->weight_nr_accesses =3D src->weight_nr_accesses; dst->weight_age =3D src->weight_age; @@ -2047,6 +2049,23 @@ static void damos_walk_cancel(struct damon_ctx *ctx) mutex_unlock(&ctx->walk_control_lock); } =20 +static void damos_charge_quota(struct damos_quota *quota, + unsigned long sz_region, unsigned long sz_applied) +{ + /* + * sz_applied could be bigger than sz_region, depending on ops + * implementation of the action, e.g., damos_pa_pageout(). Charge only + * the region size in the case. + */ + if (!quota->fail_charge_denom || sz_applied > sz_region) + quota->charged_sz +=3D sz_region; + else + quota->charged_sz +=3D sz_applied + mult_frac( + (sz_region - sz_applied), + quota->fail_charge_num, + quota->fail_charge_denom); +} + static bool damos_quota_is_full(struct damos_quota *quota, unsigned long min_region_sz) { @@ -2117,7 +2136,7 @@ static void damos_apply_scheme(struct damon_ctx *c, s= truct damon_target *t, ktime_get_coarse_ts64(&end); quota->total_charged_ns +=3D timespec64_to_ns(&end) - timespec64_to_ns(&begin); - quota->charged_sz +=3D sz; + damos_charge_quota(quota, sz, sz_applied); if (damos_quota_is_full(quota, c->min_region_sz)) { quota->charge_target_from =3D t; quota->charge_addr_from =3D r->ar.end + 1; --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5B2412DB79E; Tue, 28 Apr 2026 01:34:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340071; cv=none; b=QEu2Rn+PcBL7Q7Ol499EbDWVg+l2u1S+sjndB1mERJ8vn9JTQVTcE0GeW2PostbhEsaxfb7avoN/qmthwF6FfxRs69Xq8QfUZ8W1vq5ksJMcbOaTbBoQk3ccug7pIiSUtRDLOC99qQxvs6JuaMHIGgCR1dWk71cVf4iJn/W9cUA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340071; c=relaxed/simple; bh=/lVNhShO2zb1X1uTWNv+AxJ5viNdvqRDf7CzT4VF5M0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rsL8jt9LkLED8rg8cI+vCOxCfeZFUsNkSPARQMPwpJaZQ5VAAEMvamObSYPfd3ap6pS+4ym6Flh3kycgo9xbvwKAr3eSkEAlImjEsm9HJSfYVUlWkTfg4IrXbP+6R7jYZsohthapRWcOCCur9jxfXmLDNBqmBvA+EteLSgkIFwc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=t4qRrqkH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="t4qRrqkH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8600C2BCC7; Tue, 28 Apr 2026 01:34:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340071; bh=/lVNhShO2zb1X1uTWNv+AxJ5viNdvqRDf7CzT4VF5M0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=t4qRrqkHf0V8geYZjNhtGXFHjdk3orzEf904/p6dcoJOm/7ZSBIk0pMo2cVUdpWge n9hQCsCOKKO7mU289JAH4O6FtQYPlDT8O5+w/pUARa1YnWdB4G0dQV8OoQMqUq9W3L gFqC58D9WgNwvFqDG9KtuOeQDeyMys0zV6iZcg8oEwVW4kEt1K5xXTZDgpD21WL39A x6+zZ1pukmrnk1YduWej0KWig5Xsl4PQy92cjprBvepQElQqDnMiCmxu3AKvqnPjMr P2uqYzSCfAf09cyZPADCraT/5ciLHB4Oi336B0OVNbTNX6TekgNmJttHQ7IVUzL3aT 73EeJFp6+/9Wg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 04/11] mm/damon/sysfs-schemes: implement fail_charge_{num,denom} files Date: Mon, 27 Apr 2026 18:33:53 -0700 Message-ID: <20260428013402.115171-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Implement the user-space ABI for the DAMOS action failed region quota-charge ratio setup. For this, add two new sysfs files under the DAMON sysfs interface for DAMOS quotas. Names of the files are fail_charge_num and fail_charge_denom, and work for reading and setting the numerator and denominator of the failed regions charge ratio. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 54 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index c14a564dd8218..c3c1ff6108863 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -1509,6 +1509,8 @@ struct damon_sysfs_quotas { unsigned long reset_interval_ms; unsigned long effective_sz; /* Effective size quota in bytes */ enum damos_quota_goal_tuner goal_tuner; + unsigned int fail_charge_num; + unsigned int fail_charge_denom; }; =20 static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void) @@ -1683,6 +1685,48 @@ static ssize_t goal_tuner_store(struct kobject *kobj, return -EINVAL; } =20 +static ssize_t fail_charge_num_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_quotas *quotas =3D container_of(kobj, + struct damon_sysfs_quotas, kobj); + + return sysfs_emit(buf, "%u\n", quotas->fail_charge_num); +} + +static ssize_t fail_charge_num_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_quotas *quotas =3D container_of(kobj, + struct damon_sysfs_quotas, kobj); + int err =3D kstrtouint(buf, 0, "as->fail_charge_num); + + if (err) + return -EINVAL; + return count; +} + +static ssize_t fail_charge_denom_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_quotas *quotas =3D container_of(kobj, + struct damon_sysfs_quotas, kobj); + + return sysfs_emit(buf, "%u\n", quotas->fail_charge_denom); +} + +static ssize_t fail_charge_denom_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_quotas *quotas =3D container_of(kobj, + struct damon_sysfs_quotas, kobj); + int err =3D kstrtouint(buf, 0, "as->fail_charge_denom); + + if (err) + return -EINVAL; + return count; +} + static void damon_sysfs_quotas_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_quotas, kobj)); @@ -1703,12 +1747,20 @@ static struct kobj_attribute damon_sysfs_quotas_eff= ective_bytes_attr =3D static struct kobj_attribute damon_sysfs_quotas_goal_tuner_attr =3D __ATTR_RW_MODE(goal_tuner, 0600); =20 +static struct kobj_attribute damon_sysfs_quotas_fail_charge_num_attr =3D + __ATTR_RW_MODE(fail_charge_num, 0600); + +static struct kobj_attribute damon_sysfs_quotas_fail_charge_denom_attr =3D + __ATTR_RW_MODE(fail_charge_denom, 0600); + static struct attribute *damon_sysfs_quotas_attrs[] =3D { &damon_sysfs_quotas_ms_attr.attr, &damon_sysfs_quotas_sz_attr.attr, &damon_sysfs_quotas_reset_interval_ms_attr.attr, &damon_sysfs_quotas_effective_bytes_attr.attr, &damon_sysfs_quotas_goal_tuner_attr.attr, + &damon_sysfs_quotas_fail_charge_num_attr.attr, + &damon_sysfs_quotas_fail_charge_denom_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_quotas); @@ -2801,6 +2853,8 @@ static struct damos *damon_sysfs_mk_scheme( .weight_nr_accesses =3D sysfs_weights->nr_accesses, .weight_age =3D sysfs_weights->age, .goal_tuner =3D sysfs_quotas->goal_tuner, + .fail_charge_num =3D sysfs_quotas->fail_charge_num, + .fail_charge_denom =3D sysfs_quotas->fail_charge_denom, }; struct damos_watermarks wmarks =3D { .metric =3D sysfs_wmarks->metric, --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E43B02DFA3A; 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dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="eRybFt+i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 44CB6C2BCB7; Tue, 28 Apr 2026 01:34:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340071; bh=x42u0yyujS0MNNJ5zIzlJ5WzcqjchBB5xjDhcoIlpNo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eRybFt+iabvl4JrFNGv5dY/wGWUCCwzlEEXQfKsMxsxrjea++yxvDR5XF/u7ItIK2 35B80+wBa+TSMM55i0ITO+dRZe3C+noXe0rY/avkO7Iu3UHGjA/N8LMvuTN3edUtme tlc6oZAO9Sts5ivM85kHYH8EjfZSdq+kLTAC1hdaySyumzvR6sF/jOSmVv/jfOnA0N 7+W8JJqt1XI9HLfntRLLiKfhFinQNcNVicI/r8wNcxnyysXWXJhGFgkeZoShpw/uej rfAK1I8xSUTD/18PKOnSNwrjSd49U2sel/eLfPrBXl29Enh9AeWFckvmPMznQvbSmA OIoRm3UgAu+Qg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , "Liam R. Howlett" , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 05/11] Docs/mm/damon/design: document fail_charge_{num,denom} Date: Mon, 27 Apr 2026 18:33:54 -0700 Message-ID: <20260428013402.115171-6-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Update DAMON design document for the DAMOS action failed region quota charge ratio. Signed-off-by: SeongJae Park --- Documentation/mm/damon/design.rst | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/des= ign.rst index 622d24e35961e..fa7392b5a331d 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -576,6 +576,28 @@ interface `, refer to :ref:`weights <= sysfs_quotas>` part of the documentation. =20 =20 +.. _damon_design_damos_quotas_failed_memory_charging_ratio: + +Action-failed Memory Charging Ratio +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +DAMOS action to a given region can fail for some subsets of the memory of = the +region. For example, if the action is ``pageout`` and the region has some +unreclaimable pages, applying the action to the pages will fail. The amou= nt of +system resource that is taken for such failed action applications is usual= ly +different from that for successful action applications. For such cases, u= sers +can set different charging ratio for such failed memory. The ratio can be +specified using ``fail_charge_num`` and ``fail_charge_denom`` parameters. = The +two parameters represent the numerator and denominator of the ratio. The +feature is enabled only if ``fail_charge_denom`` is not zero. + +For example, let's suppose a DAMOS action is applied to a region of 1,000 = MiB +size. The action is successfully applied to only 700 MiB of the region. +``fail_charge_num`` and ``fail_charge_denom`` are set to ``1`` and ``1024`= `, +respectively. Then only 700 MiB and 300 KiB of size (``700 MiB + 300 MiB = * 1 / +1024``) will be charged. + + .. _damon_design_damos_quotas_auto_tuning: =20 Aim-oriented Feedback-driven Auto-tuning --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B20B52ECEAE; Tue, 28 Apr 2026 01:34:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340072; cv=none; b=V/R/iMBRTHky3VSWHi78kXyh2cGPUQ0u20iALJwUqcs6ECXXAN8tEue4fVBIUkp4ATC5YVqA7eHUwkrSVMTC2XPSi3i0+cRhUXC7dlPtd76kAQLtsrHJLAgyrzxMQ17vK/voZt9iQi3aHoPXBehqkShASdE9qGAB2FCe9SFDKFY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340072; c=relaxed/simple; bh=fJkIAWWlo48QPdeJ9YXUoXHCIlYHiM9shoj6TYfrLSQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Fe9hFgzgk+4gFW496w7dWw7YcjnndeCc219MMzOVhS/BaM6kKbBHTbdze4mOabp7N6PuiRHFSYU+2bSJL63moR6COgv3U2abEmvOutcJVyt4br+xNrtzQZfxEph0Vqt6DC+emb0TpOooAS7DRa7XXFq33YjmpqIaeo71nCwdnTc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IeKmR7UQ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="IeKmR7UQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC79BC2BCC7; Tue, 28 Apr 2026 01:34:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340072; bh=fJkIAWWlo48QPdeJ9YXUoXHCIlYHiM9shoj6TYfrLSQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IeKmR7UQvah1qRjDn/7akgBv/fphHPwmW9ugHEcx5qkaUVCVM1P53gWBUpE5nSjcS LUN2oN63KaY/k7LvtmoYQWwdUJ6dqMseS3y+5Dy96sSpQUlcs1Ri86weqeTrSLkkzV lbI+UO/ixoHuZiZW2lp4Ae7BAAG2XtIwjTHnwzpqhieDG+gFum/gROTBa5I5ObqWwy Pa4H1BloLmlggXm2qn/7PNffDheA9YFoppgvf7xect0W+gti+PEAe70Cnr9mSF9Att +m8BYfZeCHjgn24QkOAXIGpGEeBI8xWmrqkeF/zGGNq/3M2uDLbZqqKdXe8JMuPS/F +KmyLdUKw3RfA== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , "Liam R. Howlett" , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 06/11] Docs/admin-guide/mm/damon/usage: document fail_charge_{num,denom} files Date: Mon, 27 Apr 2026 18:33:55 -0700 Message-ID: <20260428013402.115171-7-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Update DAMON usage document for the DAMOS action failed regions quota charge ratio control sysfs files. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/a= dmin-guide/mm/damon/usage.rst index bfdb717441f05..d5548e460857c 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -84,7 +84,9 @@ comma (","). =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 sz/min,max =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 nr_accesses/min,max =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 age/min,max - =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = :ref:`quotas `/ms,bytes,reset_interval_ms,effective_bytes,goa= l_tuner + =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = :ref:`quotas `/ms,bytes,reset_interval_ms, + =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = effective_bytes,goal_tuner, + =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = fail_charge_num,fail_charge_denom =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 weights/sz_permil,nr_accesses_permil,age_permil =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 :ref:`goals `/nr_goals =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 =E2=94=82 0/target_metric,target_value,current_value,nid,path @@ -381,9 +383,10 @@ schemes//quotas/ The directory for the :ref:`quotas ` of the giv= en DAMON-based operation scheme. =20 -Under ``quotas`` directory, five files (``ms``, ``bytes``, -``reset_interval_ms``, ``effective_bytes`` and ``goal_tuner``) and two -directories (``weights`` and ``goals``) exist. +Under ``quotas`` directory, seven files (``ms``, ``bytes``, +``reset_interval_ms``, ``effective_bytes``, ``goal_tuner``, ``fail_charge_= num`` +and ``fail_charge_denom``) and two directories (``weights`` and ``goals``) +exist. =20 You can set the ``time quota`` in milliseconds, ``size quota`` in bytes, a= nd ``reset interval`` in milliseconds by writing the values to the three file= s, @@ -402,6 +405,13 @@ the background design of the feature and the name of t= he selectable algorithms. Refer to :ref:`goals directory ` for the goals setup. =20 +You can set the action-failed memory quota charging ratio by writing the +numerator and the denominator for the ratio to ``fail_charge_num`` and +``fail_charge_denom`` files, respectively. Reading those files will retur= n the +current set values. Refer to :ref:`design +` for more details= of +the ratio feature. + The time quota is internally transformed to a size quota. Between the transformed size quota and user-specified size quota, smaller one is appli= ed. Based on the user-specified :ref:`goal `, the --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4995C2F5474; Tue, 28 Apr 2026 01:34:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340073; cv=none; b=eAAKiEltfdqnxu0QZvSyBdniel1w4P6ld4oOHwY2k06kWaCRZE8+oMnegYsdVa+Dv3uWC4ieEwEOeAvYYuCRtIT4R9EPboQGBGL1FFuXJ2HpWWR5MYVdlmqIXRRix4r65ajVUWatDTRfcEJccV/KTELTJXJ7GTvz5n47eTIBDaQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340073; c=relaxed/simple; bh=WgiRHi50zFvHwjFSQiNfyV/FQHY8WOkdhFM9Jv3jqj0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ryxvVUBkoO4rWLjN08uvhVALCnQ4vqFdZ2SIBlSxVii2oQ/vtcnGrBPZ2X/j99F1NtK1+7sSnUIgEGsyJBkCNo7Q6pSu2hz0urm5qXD7Wak9YFFdyuJ9NUU1JdEsqyOpfUiMiMSF9/3bZ7assMs7JOEjLsp3mQCWjXlRuo0Y87Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DMYK+IiU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DMYK+IiU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9CCD1C2BCC6; Tue, 28 Apr 2026 01:34:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340073; bh=WgiRHi50zFvHwjFSQiNfyV/FQHY8WOkdhFM9Jv3jqj0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DMYK+IiUNblpb/DS7qK8c0PyqQD0wR6G2o3EsZVQRVZUJmrtesZ02gBM/MBsMoiyg sKRH3pY9Yxe4tOsO0XtkzxoaiNaXMTkwsfNedGmsOkQfQkWTd6y6aalRlhHBF5ihwE RSGJuA2HbeqrqXF3KdgcvvaeXAXXqhQdZU+gj+jvzJud6iEYWBQA+xt8ab2FXxYb6e CidzCwsvtZPTUh4ERLj00ORoK2rxzZHaSohjDglTG6nqdi4d6I++NoH3hzJoZ7wyZ/ KDC1hifafdow9/8DnkApYaMdcrUCduOnSpwcJSe3HQ/O65ad/nc51+RG37qcFTqNMr hmS0LHv6/pfgA== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , "Liam R. Howlett" , David Hildenbrand , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 07/11] Docs/ABI/damon: document fail_charge_{num,denom} Date: Mon, 27 Apr 2026 18:33:56 -0700 Message-ID: <20260428013402.115171-8-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Update DAMON ABI document for the DAMOS action failed regions quota charge ratio control sysfs files. Signed-off-by: SeongJae Park --- Documentation/ABI/testing/sysfs-kernel-mm-damon | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-damon b/Documentatio= n/ABI/testing/sysfs-kernel-mm-damon index 7059f540940f0..971c22e34e722 100644 --- a/Documentation/ABI/testing/sysfs-kernel-mm-damon +++ b/Documentation/ABI/testing/sysfs-kernel-mm-damon @@ -329,6 +329,18 @@ Contact: SeongJae Park Description: Writing to and reading from this file sets and gets the goal-based effective quota auto-tuning algorithm to use. =20 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//qu= otas/fail_charge_num +Date: Mar 2026 +Contact: SeongJae Park +Description: Writing to and reading from this file sets and gets the + action-failed memory quota charging ratio numerator. + +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//qu= otas/fail_charge_denom +Date: Mar 2026 +Contact: SeongJae Park +Description: Writing to and reading from this file sets and gets the + action-failed memory quota charging ratio denominator. + What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//qu= otas/weights/sz_permil Date: Mar 2022 Contact: SeongJae Park --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C84762D879E; Tue, 28 Apr 2026 01:34:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340073; cv=none; b=h+wd2aCZAtAdemedFEAeAYGnBAS1kZ3opQB+aXTwcHEvWTAPTNjhHWQLfr0o54q1QR6MwkNVM3bv+7rWzT/97Y9dAKfSnQEoPA9Jwnq0tVmiAUoRDexWYs/DorN+SYM57QZkQjo2neFX6Lv9gnA22gdqNF+ENNAMn85mfp9zCPg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340073; c=relaxed/simple; bh=oBXW5uIN8lzshHczxlHFHeX8VLmiX/5T2Hz8N+WZ/sY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pJ+sDi85JEwP9QqmvuR2pqSiR8p2f+0fQEdF+Nyc1Aqvb2Geu239ZijSLRURNWZxc4UXfalWgDKfOhmeQLtpK6WxIMYIJscYJxFANrNTIdP4SoSFVd2p/gtvx9iTko0u0Q0WC5T9OzJL4GPv3b9jwAlt8+cXFVPIzFtOEErdQJM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FwyTEHm8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FwyTEHm8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36923C2BCB7; Tue, 28 Apr 2026 01:34:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340073; bh=oBXW5uIN8lzshHczxlHFHeX8VLmiX/5T2Hz8N+WZ/sY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FwyTEHm80Or8EoY3Y07sV+u4M/imSwhr2NI0NYYsImWzS9cLsSA/sONsLP/uxH4zd JFLXuIneV4KEm03obAG4R0/ElK0W1CxHEiI4RErdHC5yCC1LKSmS50QqmIJ1Syh+LC AGiBLAjkj/WZfIJhueEAYhHfvJ1VE/HbEF6E8LMOQzWUi/CSB9+b4b5Ocu7BYnzDOA t2bRTPJYgBWhNJdVKuEJqhZkwwddYM+Nn2k3r/mYk+qPUAL27mEAqrBGR8Ll5cicq6 bqu8yQQFy2oVO8G5gtuSUOhZMNycXJjWsOBHFF8ct6uIaKun6Dq8ClW3Ve/2yZ91HB R/Nptel5v+z8Q== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Brendan Higgins , David Gow , damon@lists.linux.dev, kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 08/11] mm/damon/tests/core-kunit: test fail_charge_{num,denom} committing Date: Mon, 27 Apr 2026 18:33:57 -0700 Message-ID: <20260428013402.115171-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Extend damos_test_commit_quotas() kunit test to ensure damos_commit_quota() handles fail_charge_{num,denom} parameters. Signed-off-by: SeongJae Park --- mm/damon/tests/core-kunit.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h index 0030f682b23b7..1b23a22ac04c4 100644 --- a/mm/damon/tests/core-kunit.h +++ b/mm/damon/tests/core-kunit.h @@ -694,6 +694,8 @@ static void damos_test_commit_quota(struct kunit *test) .ms =3D 2, .sz =3D 3, .goal_tuner =3D DAMOS_QUOTA_GOAL_TUNER_CONSIST, + .fail_charge_num =3D 2, + .fail_charge_denom =3D 3, .weight_sz =3D 4, .weight_nr_accesses =3D 5, .weight_age =3D 6, @@ -703,6 +705,8 @@ static void damos_test_commit_quota(struct kunit *test) .ms =3D 8, .sz =3D 9, .goal_tuner =3D DAMOS_QUOTA_GOAL_TUNER_TEMPORAL, + .fail_charge_num =3D 1, + .fail_charge_denom =3D 1024, .weight_sz =3D 10, .weight_nr_accesses =3D 11, .weight_age =3D 12, @@ -717,6 +721,8 @@ static void damos_test_commit_quota(struct kunit *test) KUNIT_EXPECT_EQ(test, dst.ms, src.ms); KUNIT_EXPECT_EQ(test, dst.sz, src.sz); KUNIT_EXPECT_EQ(test, dst.goal_tuner, src.goal_tuner); + KUNIT_EXPECT_EQ(test, dst.fail_charge_num, src.fail_charge_num); + KUNIT_EXPECT_EQ(test, dst.fail_charge_denom, src.fail_charge_denom); KUNIT_EXPECT_EQ(test, dst.weight_sz, src.weight_sz); KUNIT_EXPECT_EQ(test, dst.weight_nr_accesses, src.weight_nr_accesses); KUNIT_EXPECT_EQ(test, dst.weight_age, src.weight_age); --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 204C0302163; Tue, 28 Apr 2026 01:34:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340074; cv=none; b=gQaChxIDJGBuuiDeiLyPZnQPerrW8WcsH8ttPWP/56yG2m+HcmWbGclJEzyWWuRU9s8B1CfmnBWnzvTRC4UcUEbAzcrDNjsGUpOM2WAX3+VIn3tdLF04V3f7dp+tID1zFYxPGZZmYeVR4snJq0ltiIngW1zFyVpAGB4GWIfMbfY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340074; c=relaxed/simple; bh=EIRB4p0R7OQMpXCAySjtmt5LRqO984ojhpZfxIiXyb0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pj8zsAnRsrCYaf0IKkclajMEgh8aNq9E/j8xrWlD/S72i2jm0ojS/QkRl3/0/A6C10kU399eHW5N2ygdecrLcR1hp2rVr1KhKRQ8KpCZRZE5/pL2+4RMKpiiMa77wyawqMaMaMLBdGNNifVkJ11GPcqCsezL6bCNuxwa4kcRVSw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZZcZnAsu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZZcZnAsu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE91AC2BCB8; Tue, 28 Apr 2026 01:34:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340074; bh=EIRB4p0R7OQMpXCAySjtmt5LRqO984ojhpZfxIiXyb0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZZcZnAsupewrX89PIOmNdOhVn2+tqOay0z0k+NxczHczuwJXZkL1AoRFErP2NRR3h ZVngppoziqRmwTzbPeXG+Zmk93VHdDtxyJ8G0vaH3qhGJDnJQUtEt9EtWYuQjNjWcE R/89iG/BQ8mgkA6w9BoppTli74ZSzaOxvHkijdpIu2sC+ke0TAC76jO5/2lUkMHaKd wHlMBrceCK98vgBAqlonoYeX8uB7gcACQhDvCW7U+ptOijpxvZrqqtKZYtSA94GgPd GbQfpJRI8KMS1lRa/r4ZWKyX4BPpWQpFOst0Sm0HrwF33He1ci2rnEzcqzG/QG2W7k IPXfPt7l45kkw== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Shuah Khan , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 09/11] selftests/damon/_damon_sysfs: support failed region quota charge ratio Date: Mon, 27 Apr 2026 18:33:58 -0700 Message-ID: <20260428013402.115171-10-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Extend _damon_sysfs.py for DAMOS action failed regions quota charge ratio setup, so that we can add kselftest for the new feature. Signed-off-by: SeongJae Park --- tools/testing/selftests/damon/_damon_sysfs.py | 21 +++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/damon/_damon_sysfs.py b/tools/testing/= selftests/damon/_damon_sysfs.py index 120b96ecbd741..8b12cc0484405 100644 --- a/tools/testing/selftests/damon/_damon_sysfs.py +++ b/tools/testing/selftests/damon/_damon_sysfs.py @@ -132,14 +132,17 @@ class DamosQuota: goals =3D None # quota goals goal_tuner =3D None # quota goal tuner reset_interval_ms =3D None # quota reset interval + fail_charge_num =3D None + fail_charge_denom =3D None weight_sz_permil =3D None weight_nr_accesses_permil =3D None weight_age_permil =3D None scheme =3D None # owner scheme =20 def __init__(self, sz=3D0, ms=3D0, goals=3DNone, goal_tuner=3D'consist= ', - reset_interval_ms=3D0, weight_sz_permil=3D0, - weight_nr_accesses_permil=3D0, weight_age_permil=3D0): + reset_interval_ms=3D0, fail_charge_num=3D0, fail_charge_d= enom=3D0, + weight_sz_permil=3D0, weight_nr_accesses_permil=3D0, + weight_age_permil=3D0): self.sz =3D sz self.ms =3D ms self.reset_interval_ms =3D reset_interval_ms @@ -151,6 +154,8 @@ class DamosQuota: for idx, goal in enumerate(self.goals): goal.idx =3D idx goal.quota =3D self + self.fail_charge_num =3D fail_charge_num + self.fail_charge_denom =3D fail_charge_denom =20 def sysfs_dir(self): return os.path.join(self.scheme.sysfs_dir(), 'quotas') @@ -197,6 +202,18 @@ class DamosQuota: os.path.join(self.sysfs_dir(), 'goal_tuner'), self.goal_tu= ner) if err is not None: return err + + err =3D write_file( + os.path.join(self.sysfs_dir(), 'fail_charge_num'), + self.fail_charge_num) + if err is not None: + return err + err =3D write_file( + os.path.join(self.sysfs_dir(), 'fail_charge_denom'), + self.fail_charge_denom) + if err is not None: + return err + return None =20 class DamosWatermarks: --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 758A4305E32; Tue, 28 Apr 2026 01:34:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340074; cv=none; b=SiSZE40K/VkbsAwpBn5ukcsAN/3wkaquFdXnToSHB7senFZEhforZCRH9YsfmX4hh6znjvA3HD8Eg876Fc1qr4KdIfOw65elEMHArhaAYXf3TW7XemZZaSHDNxsXPmPmGI9aulr0Ggiv1cGSstNBSZl2XyvO8QFea5H0x/GeeJg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340074; c=relaxed/simple; bh=EuOHul4fripHvwsgWhBfbomSmWCRXpHL6QQJMWdANgQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PQpLVYIUuC9NLl2jJ3QD195y9u0WBKJr7HeJBT/FnuZlvMLqcLlnjORJAy0mX8e8/eSlQyifnj5GmXaJ6oTIygUrzgmFKEHpC+3iutdovEmr49ryVK8N77Fq+bCFRiMusRuYYs2a+ILPvwIz/E221jWcNnCI+jw8qwl3jkgG5SE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=E3wwXZDm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="E3wwXZDm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E83AC19425; Tue, 28 Apr 2026 01:34:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340074; bh=EuOHul4fripHvwsgWhBfbomSmWCRXpHL6QQJMWdANgQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E3wwXZDm+0cTWZv0apzvd0Puqt7zmIVRJDT3ZJEjl1LYFTmaoffXrM8NTgnQB9KFx 1k4UOvVYqfB917urjYIWY7Thvm2rJ1u6aS8cPrZZKrMyVVmASDDA9/w52hhaLjUxuB 098Sea66YYRctrAsSmK7BrMwdeXgendh47a0D3kDwzrImPAXnmrrVLZHnpQ77nJQ32 ZLbLa1bDcRvBHJvggPFHoI7B/9m2EUPz2uMib7PMqDF99AuU8VHtoG/Ff8w0lD9O6l yePmUJpjWQW80xy7m67Qqb0Ex7I1Vvb8Pj1wCpq7fy8b0+YThX2x5TiGvsngklZ6SK FX1E8bX8A3i4A== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Shuah Khan , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 10/11] selftests/damon/drgn_dump_damon_status: support failed region quota charge ratio Date: Mon, 27 Apr 2026 18:33:59 -0700 Message-ID: <20260428013402.115171-11-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Extend drgn_dump_damon_status.py to dump DAMON internal state for DAMOS action failed regions quota charge ratio, to be able to show if the internal state for the feature is working, with future DAMON selftests. Signed-off-by: SeongJae Park --- tools/testing/selftests/damon/drgn_dump_damon_status.py | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/damon/drgn_dump_damon_status.py b/tool= s/testing/selftests/damon/drgn_dump_damon_status.py index 5b90eb8e7ef88..972948e6215f1 100755 --- a/tools/testing/selftests/damon/drgn_dump_damon_status.py +++ b/tools/testing/selftests/damon/drgn_dump_damon_status.py @@ -112,6 +112,8 @@ def damos_quota_to_dict(quota): ['goals', damos_quota_goals_to_list], ['goal_tuner', int], ['esz', int], + ['fail_charge_num', int], + ['fail_charge_denom', int], ['weight_sz', int], ['weight_nr_accesses', int], ['weight_age', int], --=20 2.47.3 From nobody Wed Jun 17 05:10:19 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E2DA630C372; Tue, 28 Apr 2026 01:34:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340075; cv=none; b=IW9vPr/G5EBgbiWoR+zACZd8/wPU2UVuM55JXpPwBR2/P4LPmi2WOVbEjd7TpHqKKmHk8JgQMDLcIchNyY1Z/IbFj2HxP/jQN+xHmb98y48jdFK0izgfEvonV5nydXlIifjihuWcHzzTxKKb2TNj6rqWPXP3X6WglIlzmaxakNs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777340075; c=relaxed/simple; bh=t5zJdXrSXfUqeg8E0cFC/+8XELPbXvEetq+3G/tXFao=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=d1AbmmqR6SluVyyxUDMkw/JosF7sd31mPZBNtMxthhdEupxDZ95VlUy5ID3DhVhKWfLAvTqjNJaCtCN9ydkkJPeTlK6XpoHBguW8kQlDEP9z8c5dVSe/wDFAW5fodAD00KQxVbCoeeTD4h/cE6Ln4LhhkXlWYVujz672nCiGvDk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Q4mrjTaJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Q4mrjTaJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7FFA3C2BCB4; Tue, 28 Apr 2026 01:34:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777340074; bh=t5zJdXrSXfUqeg8E0cFC/+8XELPbXvEetq+3G/tXFao=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q4mrjTaJBTN0LzIRNCZj7pwECqk7KOMJnhlOtYO97I5PT+9fPxsDE/ysqobr7nWJ0 qbXfihTA4bcntw0PWuME1t4oJHc8ORBXew391Z/AL0oCpDDFjY9ugusHUixJlT4woj Rq7joVjF+dQ3mWhvML7nPXUTEvV/geWePDQm3CE+BcTeAD1b5AI722A1C+U0scEf+M gVcTladCAVdvf/ESfw60+Z5TtgwPgb6ZX9tB1ZQKHOvqVXvPHtM5ge88lxwn/ZZPvX YYHgHh8hjxVSEKzmVn/B3IV+yfXjify48hbRUvnTdd6j6kgiWf4jWG8dgbDR32C28G sb6qtS5S+kRWw== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Shuah Khan , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 11/11] selftests/damon/sysfs.py: test failed region quota charge ratio Date: Mon, 27 Apr 2026 18:34:00 -0700 Message-ID: <20260428013402.115171-12-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260428013402.115171-1-sj@kernel.org> References: <20260428013402.115171-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Extend sysfs.py DAMON selftest to setup DAMOS action failed region quota charge ratio and assert the setup is made into DAMON internal state. Signed-off-by: SeongJae Park --- tools/testing/selftests/damon/sysfs.py | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/damon/sysfs.py b/tools/testing/selftes= ts/damon/sysfs.py index 387286dc449d5..cd4d82c852113 100755 --- a/tools/testing/selftests/damon/sysfs.py +++ b/tools/testing/selftests/damon/sysfs.py @@ -73,6 +73,10 @@ def assert_quota_committed(quota, dump): } assert_true(dump['goal_tuner'] =3D=3D tuner_val[quota.goal_tuner], 'goal_tuner', dump) + assert_true(dump['fail_charge_num'] =3D=3D quota.fail_charge_num, + 'fail_charge_num', dump) + assert_true(dump['fail_charge_denom'] =3D=3D quota.fail_charge_denom, + 'fail_charge_denom', dump) assert_true(dump['weight_sz'] =3D=3D quota.weight_sz_permil, 'weight_s= z', dump) assert_true(dump['weight_nr_accesses'] =3D=3D quota.weight_nr_accesses= _permil, 'weight_nr_accesses', dump) @@ -278,6 +282,8 @@ def main(): nid=3D1)], goal_tuner=3D'temporal', reset_interval_ms=3D1500, + fail_charge_num=3D1, + fail_charge_denom=3D4096, weight_sz_permil=3D20, weight_nr_accesses_permil=3D200, weight_age_permil=3D1000), --=20 2.47.3