From nobody Sat Feb 7 21:15:44 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 797392641F4; Tue, 4 Mar 2025 21:19:18 +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=1741123158; cv=none; b=ZhTpiwKC6GLRQ+YiX2t+FfFU43+aogEQJEfhxKnrjiWPAVE2vDonX4Ltgq4wcXZL3mjsAGXXutw2hMVJsJeUZl8+j7zldDNu0ViElczpffAfxcs37iSmwvZlZhfJOXEp4Av9I3d0QoOmY6hlUiohxGPlohWPSZsNFT6IfgOcKBs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741123158; c=relaxed/simple; bh=1+GLBKsLzSxJFQ7DWFpnQ3RNIvFxJfA/ezMRoeI16Y8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ltx/6VWDHBygDlXMAqteUYuCW7o9V0FUJBKeBSJCNRWhYXjgLKx3dURtMMK/FNDpeGcMc/pgEyzOR45L1r8wYZsZKVdtgAWkTTHe4NtXp23JHArczcZsPo86w9R+4SqCZi2JRddC0K+zy8NFbNMIGgKV5WZCIuWRjB9C8F8LIuM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dPOgLZev; 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="dPOgLZev" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C948EC4CEE5; Tue, 4 Mar 2025 21:19:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741123158; bh=1+GLBKsLzSxJFQ7DWFpnQ3RNIvFxJfA/ezMRoeI16Y8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dPOgLZevkRvv7BLRFMCqBUuVRZGPlsN3CRS72TzgxGKYe0HfDe6lxR8n2UmyNc768 JGMTJ5QSmwvaJDLrkIK1Wo8y0357xd7Y+GaxxDa6dcrtti3tJcE3bO98fw57l4VpQU eMzvTQMcgCr3stTR9Lj3KufTiP3onmpvw4Ra9zpe7FsKOisvmvwVcoW/b3Z8KNXG3s Pu1yLZj6amxGpf/SryrRWQlM31f6MPN60U9DC+zNLLBhj0i4iCSEfHzJDuts7HqMDp X+/+NUomBDp5hzyCriU0l0T7KjDX6siT8E2FF2n3KIWwK0Ru5GI8OZrGn6sOsdV8Qf PkVpilH0sKigQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/9] mm/damon/core: introduce damos->ops_filters Date: Tue, 4 Mar 2025 13:19:05 -0800 Message-Id: <20250304211913.53574-2-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304211913.53574-1-sj@kernel.org> References: <20250304211913.53574-1-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 filters can be categorized into two groups depending on which layer they are handled, namely core layer and ops layer. The groups are important because the filtering behavior depends on evaluation sequence of filters, and core layer-handled filters are evaluated before operations layer-handled ones. The behavior is clearly documented, but the implementation is bit inefficient and complicated. All filters are maintained in a single list (damos->filters) in mix. Filters evaluation logics in core layer and operations layer iterates all the filters on the list, while skipping filters that should be not handled by the layer of the logic. It is inefficient. Making future extensions having differentiations for filters of different handling layers will also be complicated. Add a new list that will be used for having all operations layer-handled DAMOS filters to DAMOS scheme data structure. Also add the support of its initialization and basic traversal functions. Signed-off-by: SeongJae Park --- include/linux/damon.h | 8 ++++++++ mm/damon/core.c | 1 + 2 files changed, 9 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index b3e2c793c1f4..7f76e2e99f37 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -448,6 +448,7 @@ struct damos_access_pattern { * @wmarks: Watermarks for automated (in)activation of this scheme. * @target_nid: Destination node if @action is "migrate_{hot,cold}". * @filters: Additional set of &struct damos_filter for &action. + * @ops_filters: ops layer handling &struct damos_filter objects list. * @last_applied: Last @action applied ops-managing entity. * @stat: Statistics of this scheme. * @list: List head for siblings. @@ -508,6 +509,7 @@ struct damos { int target_nid; }; struct list_head filters; + struct list_head ops_filters; void *last_applied; struct damos_stat stat; struct list_head list; @@ -858,6 +860,12 @@ static inline unsigned long damon_sz_region(struct dam= on_region *r) #define damos_for_each_filter_safe(f, next, scheme) \ list_for_each_entry_safe(f, next, &(scheme)->filters, list) =20 +#define damos_for_each_ops_filter(f, scheme) \ + list_for_each_entry(f, &(scheme)->ops_filters, list) + +#define damos_for_each_ops_filter_safe(f, next, scheme) \ + list_for_each_entry_safe(f, next, &(scheme)->ops_filters, list) + #ifdef CONFIG_DAMON =20 struct damon_region *damon_new_region(unsigned long start, unsigned long e= nd); diff --git a/mm/damon/core.c b/mm/damon/core.c index 9d37d3664030..5415b7603d01 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -375,6 +375,7 @@ struct damos *damon_new_scheme(struct damos_access_patt= ern *pattern, scheme->next_apply_sis =3D 0; scheme->walk_completed =3D false; INIT_LIST_HEAD(&scheme->filters); + INIT_LIST_HEAD(&scheme->ops_filters); scheme->stat =3D (struct damos_stat){}; INIT_LIST_HEAD(&scheme->list); =20 --=20 2.39.5 From nobody Sat Feb 7 21:15:44 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 A971F2780E6; Tue, 4 Mar 2025 21:19:19 +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=1741123159; cv=none; b=BfAc5k1SzDoO3gRm8fRJLBlgPawv9jeEJvHn5o2SgVrmvR0QG2InyGrPyF1p06xHB2PkkE8coN94tSvZIh/CePjXrxqPfInLXM+lS/AvUpCaKxWS4yK0D1X/2bes38h+K3O0USnthFNvKUkm2OiQeQ0/z+tcU5dpIeFKCOhW6cQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741123159; c=relaxed/simple; bh=npc/D62/iA9M79tii02t66kR94TtHspqQy52dl64bMM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NYZC/ClfKahoND1FAo6Ny8fYGEphXVppf8WcGc4ITAGd+hRKqjwQ+dnQTESfFNTT8b/PONkIbbIcqYhm2QdfBFsMjjpwV7lVOVJY5E6P99lswemMCsss9k0kATGLU5aRO4gLD1LDOZa/+WpHcdzu3cv/0sL3a/jvzzy7I9iBfLM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iCRgqwvI; 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="iCRgqwvI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E55E1C4CEE9; Tue, 4 Mar 2025 21:19:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741123159; bh=npc/D62/iA9M79tii02t66kR94TtHspqQy52dl64bMM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iCRgqwvIepxKyJkApXpQpFtf9uNM7OzhQLJgmaj98xMr1qkhcgYsDa+nnCpkbHJiL J3wxit9ZLErX8nYSh8Wwjfvs4E+Z9S6eu63CgACgOSlaKeoYIopwExJN/2j8EKQP9v Ur3T/foL5tPNO8J6X5Q725XhMzg1/PBGUrQLeRkpf0VT8LVQCKG+6R648hFubunCOG SDXTaTCGm1Rg9CK8GFoM6PC8L6vXsQY8DKtLOrh88On4GYwkHfpObVbelT7w0REU6i N1XXUaEQ/FdPBpUY3GU1NOuYyKZ0XB+PXtROZKtWEQEhSEI1yG+oSI4Csceux57neB bqjkubU1JzYSg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 2/9] mm/damon/paddr: support ops_filters Date: Tue, 4 Mar 2025 13:19:06 -0800 Message-Id: <20250304211913.53574-3-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304211913.53574-1-sj@kernel.org> References: <20250304211913.53574-1-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" DAMON keeps all DAMOS filters in damos->filters. Upcoming changes will make it to use damos->ops_filters for all operations layer handled DAMOS filters, though. DAMON physical address space operations set implementation (paddr) is not ready for the changes, since it handles only damos->filters. To avoid any breakage during the upcoming changes, make paddr to handle both lists. After the change is made, ->filters support on paddr can be safely removed. Signed-off-by: SeongJae Park --- mm/damon/paddr.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index d5db313ca717..2b1ea568a431 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -260,6 +260,10 @@ static bool damos_pa_filter_out(struct damos *scheme, = struct folio *folio) if (damos_pa_filter_match(filter, folio)) return !filter->allow; } + damos_for_each_ops_filter(filter, scheme) { + if (damos_pa_filter_match(filter, folio)) + return !filter->allow; + } return false; } =20 @@ -290,6 +294,12 @@ static unsigned long damon_pa_pageout(struct damon_reg= ion *r, struct damos *s, break; } } + damos_for_each_ops_filter(filter, s) { + if (filter->type =3D=3D DAMOS_FILTER_TYPE_YOUNG) { + install_young_filter =3D false; + break; + } + } if (install_young_filter) { filter =3D damos_new_filter( DAMOS_FILTER_TYPE_YOUNG, true, false); @@ -538,6 +548,8 @@ static bool damon_pa_scheme_has_filter(struct damos *s) =20 damos_for_each_filter(f, s) return true; + damos_for_each_ops_filter(f, s) + return true; return false; } =20 --=20 2.39.5 From nobody Sat Feb 7 21:15:44 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 D05E1278140; Tue, 4 Mar 2025 21:19:20 +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=1741123160; cv=none; b=gc2CelzWNRoyHBptfeiPmDf57wn754G/y/eoYfmheApTIPt4aSMCHz+Ucy6Q58MLRdP04kM1qUuSqoXvPeeL5GyrugqrH/2fXwJBQCt7C+6BnMJDKKMOGdOzafi1USnfjSbKvwMTcvFyECPbvtDlOXndVULUrx7UfMKQUHQXrJc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741123160; c=relaxed/simple; bh=6FhMRhtfgS5z0o99EQbkeXHgbive43ppIa5gFAsIPKQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Qq4AiIQW4OZ0AwTVBntELEX9/N5WHf0O0wKnRdHYsN428musZGaH5Ykw3KEVdBKDAA1ba3clRVjjqF882/0iVu52zcfoqIgL4Yrnz2LlAvaW5doQIaRciOyKeB7fJJbTwOlSwqCwJNVzGfyp+v5gTYnzIxkyBTZuKQztBopZTjo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kqIpFa+R; 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="kqIpFa+R" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20FFDC4CEE9; Tue, 4 Mar 2025 21:19:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741123160; bh=6FhMRhtfgS5z0o99EQbkeXHgbive43ppIa5gFAsIPKQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kqIpFa+RIbg45l+WZVNN2pvsN+N5xKLHk5pBg7HNxx8Wvqj9os5jidvQxjr4C3W6Q ElW6wzf8gv1cRgPliHbzAOgnLGmcH22Vti65265Vg7KAv9gHbwljGws8BvO/VXgkZn H74aAIRPmZ7kB2KeuYKh/VnuA+a5bhiOVB4csn2fLiQy3U1RHvK3HAV2LTKZ0NJCAp sbd4TGUdFyvyRqtuzqIhLTamE5avcohCCPPHljPBBvs0G3gxuDtnfBgDzS1uGOOdcx hNpMjlC84+/rIkSjrxxDZFokHNm/r1dhCbW/h5aDQ9rtkKxMzQ+6XV4APWaA/qOA2N dRmILrEr8vJRg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 3/9] mm/damon/core: support committing ops_filters Date: Tue, 4 Mar 2025 13:19:07 -0800 Message-Id: <20250304211913.53574-4-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304211913.53574-1-sj@kernel.org> References: <20250304211913.53574-1-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" DAMON kernel API callers should use damon_commit_ctx() to install DAMON parameters including DAMOS filters. But damos_commit_ops_filters(), which is called by damon_commit_ctx() for filters installing, is not handling damos->ops_filters. Hence, no DAMON kernel API caller can use damos->ops_filters. Do the committing of the ops_filters to make it usable. Signed-off-by: SeongJae Park --- mm/damon/core.c | 40 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 5415b7603d01..1daccccb5d67 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -820,7 +820,7 @@ static void damos_commit_filter( damos_commit_filter_arg(dst, src); } =20 -static int damos_commit_filters(struct damos *dst, struct damos *src) +static int damos_commit_core_filters(struct damos *dst, struct damos *src) { struct damos_filter *dst_filter, *next, *src_filter, *new_filter; int i =3D 0, j =3D 0; @@ -848,6 +848,44 @@ static int damos_commit_filters(struct damos *dst, str= uct damos *src) return 0; } =20 +static int damos_commit_ops_filters(struct damos *dst, struct damos *src) +{ + struct damos_filter *dst_filter, *next, *src_filter, *new_filter; + int i =3D 0, j =3D 0; + + damos_for_each_ops_filter_safe(dst_filter, next, dst) { + src_filter =3D damos_nth_filter(i++, src); + if (src_filter) + damos_commit_filter(dst_filter, src_filter); + else + damos_destroy_filter(dst_filter); + } + + damos_for_each_ops_filter_safe(src_filter, next, src) { + if (j++ < i) + continue; + + new_filter =3D damos_new_filter( + src_filter->type, src_filter->matching, + src_filter->allow); + if (!new_filter) + return -ENOMEM; + damos_commit_filter_arg(new_filter, src_filter); + damos_add_filter(dst, new_filter); + } + return 0; +} + +static int damos_commit_filters(struct damos *dst, struct damos *src) +{ + int err; + + err =3D damos_commit_core_filters(dst, src); + if (err) + return err; + return damos_commit_ops_filters(dst, src); +} + static struct damos *damon_nth_scheme(int n, struct damon_ctx *ctx) { struct damos *s; --=20 2.39.5 From nobody Sat Feb 7 21:15:44 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 0449327817B; Tue, 4 Mar 2025 21:19:21 +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=1741123162; cv=none; b=csnOelId8PbO4b7yvhgYaIQ7SoCtHS68Tg2YWcckilRxGjNKsrt4V9qfjAcplavLqH7BTOIgZjL0zh3tO0J+XpmDCFxNV9psGfoyD8yYQOJC49LT2gIVCJCFVx0IDZ4ls6GMTHAzQyOkVoA5IhXJfUAzZmBHaFFzymXUZfNzH7A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741123162; c=relaxed/simple; bh=Fde/lmLSQSXQ1liXQlydq/8+gonOje/B4rUucWXnWA8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=rxZHWp06tAd3vVBZg9EBtea8AOBTIEggButhlAylvQvV6OmJI8V2rvKdAVtOIFMsSeg+iOJ+pDbhRx2BYvDdqnBNC+3Y2rn3ABWTuEng8zW8dPMJBs0IJI4qgdnUxHjKP+wcwo8U2lWufYn37IH05NGDBOCqsLGvBjdsYXZwRmg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Iw3kdZOg; 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="Iw3kdZOg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43718C4CEEA; Tue, 4 Mar 2025 21:19:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741123161; bh=Fde/lmLSQSXQ1liXQlydq/8+gonOje/B4rUucWXnWA8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Iw3kdZOgSW/u/FLm6g6CMFJyQVZNC4ZhzRohI9+qPAEsY0NxlJyrAiZ7HGK1eEUgr x4Vk8tfB4zycpMiZPQ0Ww5OvmRiIRsop5SDN2uGnU4JSxklmMLOcyGHAIta55u3jtj 9u7ujb6HXYACqm7TwsTaJKYEnF+WxtwF6BOUXTGNls4j4iEZo3W+LnHtxSoYcYXjMy Wz34ShUXRd5QwdamGuRjIMf76gTHMtl58V5ITdvjNatxX26xonqU86up91zLT92NM9 27romVx/3IxV+kwLagVS6fpOD+eEtPP8gKwrhszRd7XvB7I7A0yu0WTMV7bLdRnbaf g4tjCZJQWp89g== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 4/9] mm/damon/core: put ops-handled filters to damos->ops_filters Date: Tue, 4 Mar 2025 13:19:08 -0800 Message-Id: <20250304211913.53574-5-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304211913.53574-1-sj@kernel.org> References: <20250304211913.53574-1-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->ops_filters has introduced to be used for all operations layer handled filters. But DAMON kernel API callers can put any type of DAMOS filters to any of damos->filters and damos->ops_filters. DAMON user-space ABI users have no way to use ->ops_filters at all. Update damos_add_filter(), which should be used by API callers to install DAMOS filters, to add filters to ->filters and ->ops_filters depending on their handling layer. The change forces both API callers and ABI users to use proper lists since ABI users use the API internally. Signed-off-by: SeongJae Park --- mm/damon/core.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 1daccccb5d67..3fbc31d17239 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -281,9 +281,24 @@ struct damos_filter *damos_new_filter(enum damos_filte= r_type type, return filter; } =20 +static bool damos_filter_for_ops(enum damos_filter_type type) +{ + switch (type) { + case DAMOS_FILTER_TYPE_ADDR: + case DAMOS_FILTER_TYPE_TARGET: + return false; + default: + break; + } + return true; +} + void damos_add_filter(struct damos *s, struct damos_filter *f) { - list_add_tail(&f->list, &s->filters); + if (damos_filter_for_ops(f->type)) + list_add_tail(&f->list, &s->ops_filters); + else + list_add_tail(&f->list, &s->filters); } =20 static void damos_del_filter(struct damos_filter *f) --=20 2.39.5 From nobody Sat Feb 7 21:15:44 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 2051C27934B; Tue, 4 Mar 2025 21:19:22 +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=1741123163; cv=none; b=eu4Mw/kRuMJEHSti5q3MmcaaIC0qGCjnAkzyhnOaIDJjNffyv133KVMXp3RO5bIrZJcWX+dLL3v0vMtNCavcEf8aGJUrd2O6Hn9Qb1zFmDFq9qCNnFKUEHKHbvVEAEIa8+AgbUkK/6mdvU5CGYFgIlpu+KMNw0lPpxI+i+CRlqc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741123163; c=relaxed/simple; bh=aOvI5yHdfp5ge5+cmVoLx0OBIr3elAAL0hmqCGTPnsE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Tfd86ueN+cfyp7RDHhJW2jcsohWiwEEyAnjvXVuR/wsE7ljZHTlFrwRZxWrAH3JXd+nedlCM2ylmWnKnbSd4HLzOJKMoZBUrx5LETtlj5t/bvvfP8seKYtoh8iahNDX4ulTouDB6t9Q47UVrF61swGWmImF2Ea1Wu9BBqeul+Ao= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Tp4w0ehV; 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="Tp4w0ehV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 70108C4CEEE; Tue, 4 Mar 2025 21:19:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741123162; bh=aOvI5yHdfp5ge5+cmVoLx0OBIr3elAAL0hmqCGTPnsE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Tp4w0ehVwDNHiFXxn+urIRkFgiKetm8fQ7pasLsvTZn+huWTAPjUcV5hz1WhiyAZo NUhGb3SIWTnkVariAAGLwEyVR562FvrnREZf4I9P3MH29HbQmzwWimSivvIbcd/EVQ MgsvWbit9dDoNIhIJcGlFKZ6afBKXslekyNdGy56yYp3ipfW3bol54BJO4IUB+Qgdr D49+VRBHDBMX/nPqy2Lj9kd269zG0qDdCJZlWukC1f1FT5wN8VGz0fCWFc5+74213G N+K088o+AXVIibDxfa63vZzRLL5S9IkXZiWqtuHhi6b5DEEv1q7GqQxd5On+n7AWpj bkhX/rwxy7spA== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 5/9] mm/damon/paddr: support only damos->ops_filters Date: Tue, 4 Mar 2025 13:19:09 -0800 Message-Id: <20250304211913.53574-6-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304211913.53574-1-sj@kernel.org> References: <20250304211913.53574-1-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" DAMON physical address space operation set implementation (paddr) started handling both damos->filters and damos->ops_filters to avoid breakage during the change for the ->ops_filters setup. Now the change is done, so paddr's support of ->filters is only a waste that can safely be dropped. Remove it. Signed-off-by: SeongJae Park --- mm/damon/paddr.c | 12 ------------ 1 file changed, 12 deletions(-) diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index 2b1ea568a431..dded659bb110 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -256,10 +256,6 @@ static bool damos_pa_filter_out(struct damos *scheme, = struct folio *folio) if (scheme->core_filters_allowed) return false; =20 - damos_for_each_filter(filter, scheme) { - if (damos_pa_filter_match(filter, folio)) - return !filter->allow; - } damos_for_each_ops_filter(filter, scheme) { if (damos_pa_filter_match(filter, folio)) return !filter->allow; @@ -288,12 +284,6 @@ static unsigned long damon_pa_pageout(struct damon_reg= ion *r, struct damos *s, struct folio *folio; =20 /* check access in page level again by default */ - damos_for_each_filter(filter, s) { - if (filter->type =3D=3D DAMOS_FILTER_TYPE_YOUNG) { - install_young_filter =3D false; - break; - } - } damos_for_each_ops_filter(filter, s) { if (filter->type =3D=3D DAMOS_FILTER_TYPE_YOUNG) { install_young_filter =3D false; @@ -546,8 +536,6 @@ static bool damon_pa_scheme_has_filter(struct damos *s) { struct damos_filter *f; =20 - damos_for_each_filter(f, s) - return true; damos_for_each_ops_filter(f, s) return true; return false; --=20 2.39.5 From nobody Sat Feb 7 21:15:44 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 60C6F27BF82; Tue, 4 Mar 2025 21:19:23 +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=1741123164; cv=none; b=gvTvxEAIty6jskTvUrpeMVyt9/OgZ1ea2ERmS8O1K39DUNQ+mbR2HeFz+oCGV69mMhWXChknG36DoDfDajH28tth9O0yH+llujPFxMmt5CoEcCsNHSFbg93up+8g5xom+pOoZrRsfO3hMTpw19ZUwWH1al4TljOCz5nT+EJnVxM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741123164; c=relaxed/simple; bh=EAOvbQzL6b3K8TBvvaz/3YCTyNwJ67PJ+6i3fHUuYA8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=YLso5RSX3vMiWcF9TbZEo3T814UwwcxjNXUUc0piZ5baVsfjPBbISdkdJ2Rfz34JNMS8f16/4ZWgpUJgYnChn61sFQXxHeTjgMNDiXftkpe5bRrjgLg6BCCK/DAlD2xXFHuweU/YJ7gztZg6p+aKXwAfVRdhX2jKbbhdd6vHeZQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Svab4fVh; 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="Svab4fVh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A0856C4CEE9; Tue, 4 Mar 2025 21:19:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741123163; bh=EAOvbQzL6b3K8TBvvaz/3YCTyNwJ67PJ+6i3fHUuYA8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Svab4fVhiOwVzBa67vyOMt5FwC01tvxULzewvGCpuajuPl9b7WMNEIV8xoBj70wOc vib6yUodrAqyupqCTR+6q7WYKRoEe5BiuRW94smu51GxUtm+YOclV1MmD2dPDNiwpE NyvZfq0ROunPGPvGOmozHi34nrq9bGRF6HjZ8AeQNZsr+eCroQnd1UPaJNM5ct8YtR FeMR2UgDRzOcpHfy2VR9yysG8vfMXFB9VTLktCgixYYF1l9bh415K9z7NU1UjF/4sM dHqNVW6I7SvkCa42jaxTMp+4WjexC8zt2/rdkJNFl/2y34j3XPG3eN8Kt74VSx1oiO mM4gtgPkcnoFw== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 6/9] mm/damon: add default allow/reject behavior fields to struct damos Date: Tue, 4 Mar 2025 13:19:10 -0800 Message-Id: <20250304211913.53574-7-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304211913.53574-1-sj@kernel.org> References: <20250304211913.53574-1-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" Current default allow/reject behavior of filters handling stage has made before introduction of the allow behavior. For allow-filters usage, it is confusing and inefficient. It is more intuitive to decide the default filtering stage allow/reject behavior as opposite to the last filter's behavior. The decision should be made separately for core and operations layers' filtering stages, since last core layer-handled filter is not really a last filter if there are operations layer handling filters. Keeping separate decisions for the two categories can make the logic simpler. Add fields for storing the two decisions. Signed-off-by: SeongJae Park --- include/linux/damon.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 7f76e2e99f37..52559475dbe7 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -502,6 +502,9 @@ struct damos { * layer-handled filters. If true, operations layer allows it, too. */ bool core_filters_allowed; + /* whether to reject core/ops filters umatched regions */ + bool core_filters_default_reject; + bool ops_filters_default_reject; /* public: */ struct damos_quota quota; struct damos_watermarks wmarks; --=20 2.39.5 From nobody Sat Feb 7 21:15:44 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 6ED2827C15E; Tue, 4 Mar 2025 21:19:25 +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=1741123165; cv=none; b=HaqrvYrGLSnkh+VlrFXlVMpwDKtFLotNwurg0W2oFbt3NHcO6kKb/8UxTqz/w1DGWbUqQdu4wrewGAX3eIsROwjOUpMikNrhW4s9puZhANP4K+rlsF0uTPqLxHlnTelCShgME/xIZOLNZ846COkqb/Gg3Kk/sAiA1sMxIYn+qJI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741123165; c=relaxed/simple; bh=JHR8X09g7RbF+z7f4pVptzblJHocAhQ0MhsGQMkHws4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=iDWPyS3rxVjGAp3PiisXgOzWMjI0pLcFNvjzrqT+Fr3RKRWO1VLDPQXYY3hNZH2mxKz+qrDGoYQ10ZWhG3KLMmNHhavfE6sC85uBonPJCPOqDeADAKQ9yZbXjgOw+V+XSR74pft75ssNpve8ZTd+UKmi/JOvof2LEJfy/D7ck6k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LrMKwWWt; 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="LrMKwWWt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B9E89C4CEE5; Tue, 4 Mar 2025 21:19:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741123164; bh=JHR8X09g7RbF+z7f4pVptzblJHocAhQ0MhsGQMkHws4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LrMKwWWtHJlk8IRwUXYWPpsrLjun2KZA81/oqEUwWUUFCof6U744AYZB9SGWuivag 376YD7Tlak5+1Q7fwe46b96rtbc2VvxWQmyoiLR32HL4TFFCDWryQF5AIKv2VuA+pM XKu60rm8ooVyLivi4UUZ4POoBTrrq5GieMUbIYHwPo+Z9r3hdhvw1o6rUNVuvHa09D FLMvuZ/roJSe7NvrO6lz49C0cIjtTIpy7pC21p4gRSnCFVe4/U9aU6Ot+pOLNEehae 44lsSYbTonQDfKJu5fj7ytc4/e3H5qhRmK1DxRSLKfBwdVsHRCCQNBJsp85Y/ruJDY HMtdyIgNxgltw== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 7/9] mm/damon/core: set damos_filter default allowance behavior based on installed filters Date: Tue, 4 Mar 2025 13:19:11 -0800 Message-Id: <20250304211913.53574-8-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304211913.53574-1-sj@kernel.org> References: <20250304211913.53574-1-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" Decide whether to allow or reject by default on core and opertions layer handled filters evaluation stages. It is decided as the opposite of the last installed filter's behavior. If there is no filter at all, allow by default. If there is any operations layer handled filters, core layer's filtering stage sets allowing as the default behavior regardless of the last filter of core layer-handling ones, since the last filter of core layer handled filters in the case is not really the last filter of the entire filtering stage. Also, make the core layer's DAMOS filters handling stage uses the newly set behavior field. Signed-off-by: SeongJae Park --- mm/damon/core.c | 34 ++++++++++++++++++++++++++++++++-- 1 file changed, 32 insertions(+), 2 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 3fbc31d17239..194550e033b1 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -891,6 +891,32 @@ static int damos_commit_ops_filters(struct damos *dst,= struct damos *src) return 0; } =20 +/** + * damos_filters_default_reject() - decide whether to reject memory that d= idn't + * match with any given filter. + * @filters: Given DAMOS filters of a group. + */ +static bool damos_filters_default_reject(struct list_head *filters) +{ + struct damos_filter *last_filter; + + if (list_empty(filters)) + return false; + last_filter =3D list_last_entry(filters, struct damos_filter, list); + return last_filter->allow; +} + +static void damos_set_filters_default_reject(struct damos *s) +{ + if (!list_empty(&s->ops_filters)) + s->core_filters_default_reject =3D false; + else + s->core_filters_default_reject =3D + damos_filters_default_reject(&s->filters); + s->ops_filters_default_reject =3D + damos_filters_default_reject(&s->ops_filters); +} + static int damos_commit_filters(struct damos *dst, struct damos *src) { int err; @@ -898,7 +924,11 @@ static int damos_commit_filters(struct damos *dst, str= uct damos *src) err =3D damos_commit_core_filters(dst, src); if (err) return err; - return damos_commit_ops_filters(dst, src); + err =3D damos_commit_ops_filters(dst, src); + if (err) + return err; + damos_set_filters_default_reject(dst); + return 0; } =20 static struct damos *damon_nth_scheme(int n, struct damon_ctx *ctx) @@ -1580,7 +1610,7 @@ static bool damos_filter_out(struct damon_ctx *ctx, s= truct damon_target *t, return !filter->allow; } } - return false; + return s->core_filters_default_reject; } =20 /* --=20 2.39.5 From nobody Sat Feb 7 21:15:44 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 3DE1527C851; Tue, 4 Mar 2025 21:19:26 +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=1741123166; cv=none; b=sjJegE9UGYq3IDK0tnrfQlhAvX3NE8mnQxuFBoOUCx0jfgNzbZV3dFmCf3hBxn5+lSLrVF3eq/LXjGJMnl4hVo6QFR0ONBr4ePnWzhkoiEuHeltFm7rLMIWaiiaVwaFEuyTTg6YDqP8fZoq+rlGxWrf1Xgc6McpKCC19CtzxjyU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741123166; c=relaxed/simple; bh=ZliShDrZ0L46pvsTW9GzGZb0sxInjXIUsFCHMS3ng74=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=IduQ9Yi8NWsSYGd8PoxI2wK4X+bEmjvY1Dh2i8JMk5j3emzERXa/XYwbti/mD998RtY+3n613NfDrTi9cYzeXKWxfTiQYLzdtoIrem5VGLVJIOcK0TKUq8tq/3dZxqfFi5evkFA2OzrmjCpJJvSBK/1F1oGE8zXC/Xl3oFvsG28= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=M6UHmq9j; 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="M6UHmq9j" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DCB93C4CEED; Tue, 4 Mar 2025 21:19:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741123166; bh=ZliShDrZ0L46pvsTW9GzGZb0sxInjXIUsFCHMS3ng74=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M6UHmq9j1mkN0E/jbDoKlPvDDEXN/HEofEzXOoAFv0R1wVXpPeAhVFQJJaUGEd92Y jQ1s619HlVIVL8SyV04x2TWXiNMexUhRdUYdtPTaOVD2qGOdcZrhCEgjdHE2ByQ7Md DRVjaE9NdYdxM3bqI5sD2SPg0cDGH8C8Wc30mrp5pISWr9OFgd2YVZeXp6yDIwh8Tt BjGI9s/MfnA2tJF8PuQutJmOjRwrHQjugfSr1VVxLI0KAzSxYzMu6WJoGS4FVOXjbT Rywfe/pxqGFCmot7EwubXP2V6pTtKe64V+1xGioybpTKR999XhhpOHiYk7c2ZjbAnZ 2aVtS7qsiY9fQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 8/9] mm/damon/paddr: respect ops_filters_default_reject Date: Tue, 4 Mar 2025 13:19:12 -0800 Message-Id: <20250304211913.53574-9-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304211913.53574-1-sj@kernel.org> References: <20250304211913.53574-1-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" Use damos->ops_filters_default_reject, which is set based on the installed filters' behaviors, from physical address space DAMON operations set. Signed-off-by: SeongJae Park --- mm/damon/paddr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index dded659bb110..fba8b3c8ba30 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -260,7 +260,7 @@ static bool damos_pa_filter_out(struct damos *scheme, s= truct folio *folio) if (damos_pa_filter_match(filter, folio)) return !filter->allow; } - return false; + return scheme->ops_filters_default_reject; } =20 static bool damon_pa_invalid_damos_folio(struct folio *folio, struct damos= *s) --=20 2.39.5 From nobody Sat Feb 7 21:15:44 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 BE9C427CB12; Tue, 4 Mar 2025 21:19:27 +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=1741123167; cv=none; b=g/3OH06YITdcg2G6A125kzjGpxE+KFVKfDqLv2jfZzNTLo10MYfgt4zlYpRQjJySk30dc2DIJ2UjMwY4VqW9Wwl53XaHcOHEtL9Pj74JKn6nYd6A604NLPhOLdu/fmCaOg/3XsCaRg20EFCbnzsJaDQGOrOwllPTIuIKO9DpQK8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741123167; c=relaxed/simple; bh=MvYdk6+CJs1x3c6be1UzpWng25V7d78Qpub9AKz7s0w=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=UnYByb5dmHk0dHhubw4AlkP7UEpXy9zmd92TviR5XzhUosHy0d6AqwWeNETcWlGEEl8dblN0JHD6tCsqcJ1uHmpyI5aEmBYA25n2YSXNjtJWET54PccfFCeKgNSwW+WF4WL0nKgDSXanZPQaaRce3VHvlDBZgtCx+3ghIO45P7E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=H+yFtLDF; 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="H+yFtLDF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1049CC4CEE5; Tue, 4 Mar 2025 21:19:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741123167; bh=MvYdk6+CJs1x3c6be1UzpWng25V7d78Qpub9AKz7s0w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H+yFtLDFGNtuTNbyJUs+cxgvACAguJ1tXWM+lVJ7fZHcH3tKreNyIYL/74ILQnPBF LlTEEqtW0LpjlYbcTMRDaiB0S8R5VwCl0QAmj4+m4Z/cMKj7SnTTIZH0u0dGbq15km XK8ubi0/sZefriDo97HjeujAKsKrZA4rtUA6leE6Z7jQFr81uQtBYPxTRh9QM6VEcw DhPEPbOV8b4U43JYDC4igFQ6atTlB4hhQLvgcCwUjdYDOoZC7ifnG4fpihSm5GpHwY YejZz9hEeZTh1c0n966bcFw8g722XNw6Lg6sL9DBfHXMS2xhiBKamFd/HXqSdbxpZn +/ver5JBcmoZQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Jonathan Corbet , damon@lists.linux.dev, kernel-team@meta.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 9/9] Docs/mm/damon/design: update for changed filter-default behavior Date: Tue, 4 Mar 2025 13:19:13 -0800 Message-Id: <20250304211913.53574-10-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250304211913.53574-1-sj@kernel.org> References: <20250304211913.53574-1-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 the design documentation for changed DAMOS filters default allowance behaviors. Signed-off-by: SeongJae Park --- Documentation/mm/damon/design.rst | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/des= ign.rst index 26c9ab10daf7..0cf678d98b1b 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -631,9 +631,10 @@ When multiple filters are installed, the group of filt= ers that handled by the core layer are evaluated first. After that, the group of filters that han= dled by the operations layer are evaluated. Filters in each of the groups are evaluated in the installed order. If a part of memory is matched to one o= f the -filter, next filters are ignored. If the memory passes through the filters +filter, next filters are ignored. If the part passes through the filters evaluation stage because it is not matched to any of the filters, applying= the -scheme's action to it is allowed, same to the behavior when no filter exis= ts. +scheme's action to it depends on the last filter's allowance type. If the= last +filter was for allowing, the part of memory will be rejected, and vice ver= sa. =20 For example, let's assume 1) a filter for allowing anonymous pages and 2) another filter for rejecting young pages are installed in the order. If a= page @@ -645,11 +646,6 @@ second reject-filter blocks it. If the page is neithe= r anonymous nor young, the page will pass through the filters evaluation stage since there is no matching filter, and the action will be applied to the page. =20 -Note that the action can equally be applied to memory that either explicit= ly -filter-allowed or filters evaluation stage passed. It means that installi= ng -allow-filters at the end of the list makes no practical change but only -filters-checking overhead. - Below ``type`` of filters are currently supported. =20 - Core layer handled --=20 2.39.5