From nobody Sun Feb 8 09:10:13 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 47A5B5B5DE; Mon, 19 Feb 2024 19:44:50 +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=1708371890; cv=none; b=ShGrz1f6pQv5NvbOuZsls70kl/po+PGwqbDY03aJn3bpXe5kKMuiHbkgDKhkKpYXJiZRGKfTTsdR5n4wZ3PGZSKS8FGdGTmZXad97v7VA32zgg5Yxo2zvYQxVK97V5gDl3j4R4L7WdjLplZosGUIo18HTCBR81a5zGULYJ8LnMA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708371890; c=relaxed/simple; bh=tG3S12R9lWJQ+3nlob/l1OneJpRLcwIKt8aIF6Enn4k=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=pS3tZD9Gt7h3oPFKhI5Hz+RD/9AXMdzVTYNBsXDafOeLDlOJxPO2zhOz2PAHLIe6xTvoGWLsuY0KEdY32pkO7z4w0p/MIy2NQ471luQELczPeaIFn8PLjhKGxAGYvHVoRbqyWuj5BLjvpdalnnJvqCUJ+XFYYAvwdOQokNptdh0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ml2xbaVH; 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="Ml2xbaVH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C78DEC43390; Mon, 19 Feb 2024 19:44:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1708371890; bh=tG3S12R9lWJQ+3nlob/l1OneJpRLcwIKt8aIF6Enn4k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ml2xbaVHRr850LD2Xo3UE5RqNzk6jup3abKGVZsJufjCxh4FJL1I8ZLvAZQoyItue HsySrTPrtzqdevNi77IFL3ZvmPJis7apE/tV6U6QtXX2SNDv5FT/sKqi2/hKWVjzoe gdoaRsNbvsNuyUEd4Lq3oJ5reSR7mh+S046aZHsPibxoaN4WpBJaxV5l/AHDuPka7n HQ2YIwBqI3s/axquI4sbDmMIpgQRcTMt9Ac6Ol1oXPTRv/6lWDDkUuFj/3whWZSJmf hHiEKQnRplZQhMflDZlQr8UmQs0rNWwf6LwEEx3x0UJg11hlIUZCbjrkPrqcf9wZES /bSAM8OTHrttw== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 19/20] mm/damon/reclaim: implement memory PSI-driven quota self-tuning Date: Mon, 19 Feb 2024 11:44:30 -0800 Message-Id: <20240219194431.159606-20-sj@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240219194431.159606-1-sj@kernel.org> References: <20240219194431.159606-1-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" Support the PSI-driven quota self-tuning from DAMON_RECLAIM by introducing yet another parameter, 'quota_mem_pressure_us'. Users can set the desired amount of memory pressure stall time per each quota reset interval using the parameter. Then DAMON_RECLAIM monitor the memory pressure stall time, specifically system-wide memory 'some' PSI value that increased during the given time interval, and self-tune the quota using the DAMOS core logic. Signed-off-by: SeongJae Park --- mm/damon/reclaim.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index 9df6b8819998..9bd341d62b4c 100644 --- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -62,6 +62,21 @@ static struct damos_quota damon_reclaim_quota =3D { }; DEFINE_DAMON_MODULES_DAMOS_QUOTAS(damon_reclaim_quota); =20 +/* + * Desired level of memory pressure-stall time in microseconds. + * + * While keeping the caps that set by other quotas, DAMON_RECLAIM automati= cally + * increases and decreases the effective level of the quota aiming this le= vel of + * memory pressure is incurred. System-wide ``some`` memory PSI in micros= econds + * per quota reset interval (``quota_reset_interval_ms``) is collected and + * compared to this value to see if the aim is satisfied. Value zero means + * disabling this auto-tuning feature. + * + * Disabled by default. + */ +static unsigned long quota_mem_pressure_us __read_mostly; +module_param(quota_mem_pressure_us, ulong, 0600); + /* * User-specifiable feedback for auto-tuning of the effective quota. * @@ -198,6 +213,16 @@ static int damon_reclaim_apply_parameters(void) &old_scheme->quota); } =20 + if (quota_mem_pressure_us) { + goal =3D damos_new_quota_goal(DAMOS_QUOTA_SOME_MEM_PSI_US, + quota_mem_pressure_us); + if (!goal) { + damon_destroy_scheme(scheme); + return -ENOMEM; + } + damos_add_quota_goal(&scheme->quota, goal); + } + if (quota_autotune_feedback) { goal =3D damos_new_quota_goal(DAMOS_QUOTA_USER_INPUT, 10000); if (!goal) { --=20 2.39.2