From nobody Sun Feb 8 12:40:39 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 8B899139E; Thu, 27 Feb 2025 01:58:11 +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=1740621491; cv=none; b=OBWew91s938tykafDuvh8dkYPRsMDa3s786GsviV7bMH4y0f6y/5fgu7kPf03ABi6gc7IDfjsMHpS7eMk6HCCcB4hSsG2HCiBYtVeSgzJ/fQaX8ycVEjq1DhIcdOtOPTLxciuEFmor0jvu7E27lFXBW/vB6JqPkjL6IF3IejPP8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740621491; c=relaxed/simple; bh=tQqSkhuPbb1T5x6cMu4V0N9ePh3tWbcGixS02DkoMHk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=PCTV4A8N+lctoB5ruKDNlbfBgmPUBweZiTrRc/cOS9rTVAK9cy8TDlEhMtmW7OyqV3avPbBxU1ZbCkdN0686s9iANkjSgYBj/DEKxdnD2qzTqsf662u2Lx7oMVytQ924kqFqBLmRqHyurCMuC/f7sa9xIozzpMMklOYCXZ6nk9k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YFoEwWOQ; 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="YFoEwWOQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E04EEC4CEE8; Thu, 27 Feb 2025 01:58:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740621491; bh=tQqSkhuPbb1T5x6cMu4V0N9ePh3tWbcGixS02DkoMHk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YFoEwWOQMtYL3tiHZY1Klb9D+0FI6oiHIg3qJP9gQ78IuyJzv7mC4Z5XiRo+eS7nE +X9R8bAUwlgr0l6XZKdzqTkFzZMhmbd/P/Eha3YGAjfIylzddDwrO7+ZyoLTLWifu5 Tu2FKElANpXcF/pdBlIchfNiSWjeMm3yJ1J+d1+450u2LbP2A3i/gN+uwdA4m690lK fMyX5xpGp9iB9GtaAZHtik2A0zQ/Jck7wC2VdhVNvpV4Q2movxtcZQMD9ZdPLGG+TZ rshdBICJI0Y7/Iu2K60V4q/eKP4SucGbQPACyRyshuj2ZwIBdhYJT7S5rtRc7HD2oa 4SoI53OREUdiw== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , 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: [RFC PATCH v2 9/9] Docs/mm/damon/design: update for changed filter-default behavior Date: Wed, 26 Feb 2025 17:57:54 -0800 Message-Id: <20250227015754.38789-10-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250227015754.38789-1-sj@kernel.org> References: <20250227015754.38789-1-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 5af991551a86..ffea744e4889 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -581,9 +581,10 @@ 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 @@ -595,11 +596,6 @@ 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