From nobody Sun Feb 8 09:10:14 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 1BF215B1F1; Mon, 19 Feb 2024 19:44:49 +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=St1dBuFDlytkJldvv2+Nt6LzJgoy9CCwXBdUrKC3dBExjM/SiorVBt27Vs4RMZ4ZxbFuJreAWH3aGHza1wh3vQ0UTtnIMEFdOswTrtgL+VY7T0iJnkoR+EieLwWVcS5WsplpfO8VdflgsP5/sLz4ZRqD0ThbHkh9P/A6xvRVNeg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708371890; c=relaxed/simple; bh=md7Aj2wC1qQQtLcqUJ8iiiADXUQCURmj3A5KbIYpZeI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=eARbbFadEAxRXuZGhS6+byLjNpoDbr7dXgvZ5+Zd/coLU1sPFVJbjB64PDdbkwvNklZidjrkOaZG/RbBHBdIbC9AFQWscuGCbrtKLOB4+gRTsZUsqnBm/um5mKSRB6Fm126uTT1NFirvYCzo9dSLxsyOH2BM0PA32IQVIZwX1kY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rFJSr6uM; 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="rFJSr6uM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C0DAC433B2; 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=1708371889; bh=md7Aj2wC1qQQtLcqUJ8iiiADXUQCURmj3A5KbIYpZeI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rFJSr6uMfuHvK3mAQWBO/Kx6owcMmb7rsY4jYWRds3IthNLEW3TlfK7jgsRfr4CSM dN61MrBA2XaPqDMU1gaWjxDOp5uJue4FiXV7dyB9ih0d1yjDW8TJqFmyoJ/AprBXak +FjLU5myQyDjsWWNPpqZTo7WXY0W2RxROETQtMeADxrfSn5wvY7a6iFAWvj+4JDzLp O61GWEWp+dqyVwTmB+0q+9dX6dgijC15QKRxTU3XGe0mlKXQzQaYL3LVdw/xMeOVmQ bToBakwXJn07j5AZmC/mO61+fYpOd8aT2rRkCdhkI0gbIiIPbCe1sxCqAirQ894/Nl te5B+uRH2irWg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 18/20] mm/damon/reclaim: implement user-feedback driven quota auto-tuning Date: Mon, 19 Feb 2024 11:44:29 -0800 Message-Id: <20240219194431.159606-19-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" DAMOS supports user-feedback driven quota auto-tuning, but only DAMON sysfs interface is using it. Add support of the feature on DAMON_RECLAIM by adding one more input parameter, namely 'quota_autotune_feedback', for providing the user feedback to DAMON_RECLAIM. It assumes the target value of the feedback is 10,000. Signed-off-by: SeongJae Park --- mm/damon/reclaim.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index 66e190f0374a..9df6b8819998 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 +/* + * User-specifiable feedback for auto-tuning of the effective quota. + * + * While keeping the caps that set by other quotas, DAMON_RECLAIM automati= cally + * increases and decreases the effective level of the quota aiming receivi= ng this + * feedback of value ``10,000`` from the user. DAMON_RECLAIM assumes the = feedback + * value and the quota are positively proportional. Value zero means disa= bling + * this auto-tuning feature. + * + * Disabled by default. + * + */ +static unsigned long quota_autotune_feedback __read_mostly; +module_param(quota_autotune_feedback, ulong, 0600); + static struct damos_watermarks damon_reclaim_wmarks =3D { .metric =3D DAMOS_WMARK_FREE_MEM_RATE, .interval =3D 5000000, /* 5 seconds */ @@ -159,11 +174,13 @@ static void damon_reclaim_copy_quota_status(struct da= mos_quota *dst, dst->charged_from =3D src->charged_from; dst->charge_target_from =3D src->charge_target_from; dst->charge_addr_from =3D src->charge_addr_from; + dst->esz_bp =3D src->esz_bp; } =20 static int damon_reclaim_apply_parameters(void) { struct damos *scheme, *old_scheme; + struct damos_quota_goal *goal; struct damos_filter *filter; int err =3D 0; =20 @@ -180,6 +197,17 @@ static int damon_reclaim_apply_parameters(void) damon_reclaim_copy_quota_status(&scheme->quota, &old_scheme->quota); } + + if (quota_autotune_feedback) { + goal =3D damos_new_quota_goal(DAMOS_QUOTA_USER_INPUT, 10000); + if (!goal) { + damon_destroy_scheme(scheme); + return -ENOMEM; + } + goal->current_value =3D quota_autotune_feedback; + damos_add_quota_goal(&scheme->quota, goal); + } + if (skip_anon) { filter =3D damos_new_filter(DAMOS_FILTER_TYPE_ANON, true); if (!filter) { --=20 2.39.2