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[23.116.43.216]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7943b2d060esm6104507b3.56.2026.01.22.20.57.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jan 2026 20:57:45 -0800 (PST) From: Ravi Jonnalagadda To: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: sj@kernel.org, akpm@linux-foundation.org, corbet@lwn.net, bijan311@gmail.com, ajayjoshi@micron.com, Ravi Jonnalagadda Subject: [RFC PATCH 3/5] mm/damon/core: add new ops-specific goal metric Date: Thu, 22 Jan 2026 20:57:26 -0800 Message-ID: <20260123045733.6954-4-ravis.opensrc@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260123045733.6954-1-ravis.opensrc@gmail.com> References: <20260123045733.6954-1-ravis.opensrc@gmail.com> 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" Convert static functions in core.c to pass damon_ctx* and damos* down to `damos_set_quota_goal_current_value()`. This keeps all goal metrics (PSI, node_mem*, node_memcg*, and the new node_sys_bp) computed in one place, while core remains generic and ops-specific computation is delegated via ctx->ops.get_goal_metric(). Only static functions in this file are touched; no external ABI changes. Signed-off-by: Ravi Jonnalagadda --- mm/damon/core.c | 34 +++++++++++++++++++++++++++------- 1 file changed, 27 insertions(+), 7 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 84f80a20f233..d898bfcbef72 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2119,8 +2119,20 @@ static unsigned long damos_get_node_memcg_used_bp( } #endif =20 +static unsigned long +damos_get_goal_metric_from_ops(struct damon_ctx *ctx, struct damos *scheme, + const struct damos_quota_goal *goal) +{ + if (!ctx || !goal) + return 0; + if (!ctx->ops.get_goal_metric) + return 0; + return ctx->ops.get_goal_metric(ctx, scheme, goal); +} =20 -static void damos_set_quota_goal_current_value(struct damos_quota_goal *go= al) +static void damos_set_quota_goal_current_value(struct damon_ctx *ctx, + struct damos *scheme, + struct damos_quota_goal *goal) { u64 now_psi_total; =20 @@ -2141,19 +2153,25 @@ static void damos_set_quota_goal_current_value(stru= ct damos_quota_goal *goal) case DAMOS_QUOTA_NODE_MEMCG_FREE_BP: goal->current_value =3D damos_get_node_memcg_used_bp(goal); break; + case DAMOS_QUOTA_NODE_SYS_BP: + goal->current_value =3D damos_get_goal_metric_from_ops(ctx, + scheme, goal); + break; default: break; } } =20 /* Return the highest score since it makes schemes least aggressive */ -static unsigned long damos_quota_score(struct damos_quota *quota) +static unsigned long damos_quota_score(struct damon_ctx *ctx, + struct damos *scheme, + struct damos_quota *quota) { struct damos_quota_goal *goal; unsigned long highest_score =3D 0; =20 damos_for_each_quota_goal(goal, quota) { - damos_set_quota_goal_current_value(goal); + damos_set_quota_goal_current_value(ctx, scheme, goal); highest_score =3D max(highest_score, goal->current_value * 10000 / goal->target_value); @@ -2165,7 +2183,9 @@ static unsigned long damos_quota_score(struct damos_q= uota *quota) /* * Called only if quota->ms, or quota->sz are set, or quota->goals is not = empty */ -static void damos_set_effective_quota(struct damos_quota *quota) +static void damos_set_effective_quota(struct damon_ctx *ctx, + struct damos *scheme, + struct damos_quota *quota) { unsigned long throughput; unsigned long esz =3D ULONG_MAX; @@ -2176,7 +2196,7 @@ static void damos_set_effective_quota(struct damos_qu= ota *quota) } =20 if (!list_empty("a->goals)) { - unsigned long score =3D damos_quota_score(quota); + unsigned long score =3D damos_quota_score(ctx, scheme, quota); =20 quota->esz_bp =3D damon_feed_loop_next_input( max(quota->esz_bp, 10000UL), @@ -2227,7 +2247,7 @@ static void damos_adjust_quota(struct damon_ctx *c, s= truct damos *s) /* First charge window */ if (!quota->total_charged_sz && !quota->charged_from) { quota->charged_from =3D jiffies; - damos_set_effective_quota(quota); + damos_set_effective_quota(c, s, quota); } =20 /* New charge window starts */ @@ -2240,7 +2260,7 @@ static void damos_adjust_quota(struct damon_ctx *c, s= truct damos *s) quota->charged_sz =3D 0; if (trace_damos_esz_enabled()) cached_esz =3D quota->esz; - damos_set_effective_quota(quota); + damos_set_effective_quota(c, s, quota); if (trace_damos_esz_enabled() && quota->esz !=3D cached_esz) damos_trace_esz(c, s, quota); } --=20 2.43.0