From nobody Sun Feb 8 06:54:23 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