From mboxrd@z Thu Jan 1 00:00:00 1970 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 F26015BAE1; 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=1708371891; cv=none; b=UVOjBbWalIEX+LFOUrO/ONFDudk4HA9B5HDFJVCcVyMyuNyqVM5+N4JSSFQPINXH8dnF9p8/cAxv5ZtFH7M3Lk9AWq82APAnQNcOOKlTQO1jT7mmXqag0dkTGtOQPMtsfCP4b4FCpH5YWYDuaBHLwXAfP2ARwiVzn72XBwloOB8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708371891; c=relaxed/simple; bh=N9nR7nwUdsukBui32rCfnM5+OryMCusxZ8X3or6m4gs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nZixfB0rYYq8AcyKehY0F1SuScN/nMe2x4oLn1gX6KImqKaH4QQqQcOTRF3TAOczurA2uh2DxPkPXBava3JEv+B5g8xWvikndPXIXsCvoBCvrbkb/VEegmMYvsiW5OTzI06WBxRGcw1OM0Mc86y0lqRRArYayXXhRlyP6BBrfow= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KqdSM2r2; 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="KqdSM2r2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5D981C43394; Mon, 19 Feb 2024 19:44:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1708371890; bh=N9nR7nwUdsukBui32rCfnM5+OryMCusxZ8X3or6m4gs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KqdSM2r2arnrE2pBIUDFF7hZiMjke6At78DYHjdLpERwp7GzGMMfZrZD/XkvVsvoL iZ0gKt+cXZC2/Q6/wDxgAXwR2lScpDLfLDBK0fbWYh8QYEaBEUqQaD8GbSEYU19OnH U++3UpC6Jpa+GOpKK5QyaegBWlVfHsoysde0a5MGIv1cNeG+RjS1KFiSJb8z408nxj LTZLeZw/EPiwFOioMXDWha/73iN4Zoz2vCX2USa/2Djbqs9MMszoIsoedfNOl1FCfS 7RKT1NeXBEKPFeYON6dpCo1wCv301lTmRD+TNX3etwdGvFarVDTz+/bbCnHbR5kJo9 LiI+VOgnX3CPg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Jonathan Corbet , damon@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 20/20] Docs/admin-guide/mm/damon/reclaim: document auto-tuning parameters Date: Mon, 19 Feb 2024 11:44:31 -0800 Message-Id: <20240219194431.159606-21-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-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Update DAMON_RECLAIM usage document for the user/self feedback based auto-tuning of the quota. Signed-off-by: SeongJae Park --- .../admin-guide/mm/damon/reclaim.rst | 27 +++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/Documentation/admin-guide/mm/damon/reclaim.rst b/Documentation/admin-guide/mm/damon/reclaim.rst index 343e25b252f4..af05ae617018 100644 --- a/Documentation/admin-guide/mm/damon/reclaim.rst +++ b/Documentation/admin-guide/mm/damon/reclaim.rst @@ -117,6 +117,33 @@ milliseconds. 1 second by default. +quota_mem_pressure_us +--------------------- + +Desired level of memory pressure-stall time in microseconds. + +While keeping the caps that set by other quotas, DAMON_RECLAIM automatically +increases and decreases the effective level of the quota aiming this level of +memory pressure is incurred. System-wide ``some`` memory PSI in microseconds +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. + +quota_autotune_feedback +----------------------- + +User-specifiable feedback for auto-tuning of the effective quota. + +While keeping the caps that set by other quotas, DAMON_RECLAIM automatically +increases and decreases the effective level of the quota aiming receiving this +feedback of value ``10,000`` from the user. DAMON_RECLAIM assumes the feedback +value and the quota are positively proportional. Value zero means disabling +this auto-tuning feature. + +Disabled by default. + wmarks_interval --------------- -- 2.39.2