From nobody Wed Apr 8 14:21:54 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B1041FA373E for ; Tue, 25 Oct 2022 17:37:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231664AbiJYRhK (ORCPT ); Tue, 25 Oct 2022 13:37:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231259AbiJYRg7 (ORCPT ); Tue, 25 Oct 2022 13:36:59 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B437E0DD for ; Tue, 25 Oct 2022 10:36:58 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id CA21A61A90 for ; Tue, 25 Oct 2022 17:36:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C3774C433C1; Tue, 25 Oct 2022 17:36:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1666719417; bh=+caf26+jd72lruUI8kvmUSn/EY6APaB7dnve/Z0xjuA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VrvuZF1rz0yy76gaafEWaleR/CkM5YsNrvrCOFv6/E/w/seFIqYB3UP9+6l4nkUTG ZvaeD6LBqntTUHJSQYSR8rE458QNlCE4yoc5sowKYsyMG68vZ5Hfx+1Tk5RzBwZDjn En713epPu9yRhZ/GWV1RvdxH7xh1lnwvRF+yUwj18v7h3FaEoskB39vXx82qym80d0 0FlNhjJ58O79R1P46X9E5ZPNQmfjaMLSyaeVFQogOnq+so/lHveaSACm4ezDf/7u29 hIZBH9Ax7ptOX8LFis2l27TqE0j+wh3OOxDcxTBbVrZGJx14i+gIJ3el2R+euIju8M seP77KD02p9tQ== From: SeongJae Park To: Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, SeongJae Park Subject: [PATCH 3/4] mm/damon/lru_sort: enable and disable synchronously Date: Tue, 25 Oct 2022 17:36:49 +0000 Message-Id: <20221025173650.90624-4-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221025173650.90624-1-sj@kernel.org> References: <20221025173650.90624-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Writing a value to DAMON_RECLAIM's 'enabled' parameter turns on or off DAMON in an ansychronous way. This means the parameter cannot be used to read the current status of DAMON_RECLAIM. 'kdamond_pid' parameter should be used instead for the purpose. The documentation is easy to be read as it works in a synchronous way, so it is a little bit confusing. It also makes the user space tooling dirty. There's no real reason to have the asynchronous behavior, though. Simply make the parameter works synchronously, rather than updating the document. Signed-off-by: SeongJae Park --- mm/damon/lru_sort.c | 51 +++++++++++++++++++-------------------------- 1 file changed, 22 insertions(+), 29 deletions(-) diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c index 5c60163e556c..2a532e3983df 100644 --- a/mm/damon/lru_sort.c +++ b/mm/damon/lru_sort.c @@ -9,7 +9,6 @@ =20 #include #include -#include =20 #include "modules-common.h" =20 @@ -235,38 +234,31 @@ static int damon_lru_sort_turn(bool on) return 0; } =20 -static struct delayed_work damon_lru_sort_timer; -static void damon_lru_sort_timer_fn(struct work_struct *work) -{ - static bool last_enabled; - bool now_enabled; - - now_enabled =3D enabled; - if (last_enabled !=3D now_enabled) { - if (!damon_lru_sort_turn(now_enabled)) - last_enabled =3D now_enabled; - else - enabled =3D last_enabled; - } -} -static DECLARE_DELAYED_WORK(damon_lru_sort_timer, damon_lru_sort_timer_fn); - -static bool damon_lru_sort_initialized; - static int damon_lru_sort_enabled_store(const char *val, const struct kernel_param *kp) { - int rc =3D param_set_bool(val, kp); + bool is_enabled =3D enabled; + bool enable; + int err; + + err =3D strtobool(val, &enable); + if (err) + return err; =20 - if (rc < 0) - return rc; + if (is_enabled =3D=3D enable) + return 0; =20 - if (!damon_lru_sort_initialized) - return rc; + /* Called before init function. The function will handle this. */ + if (!ctx) + goto set_param_out; =20 - schedule_delayed_work(&damon_lru_sort_timer, 0); + err =3D damon_lru_sort_turn(enable); + if (err) + return err; =20 - return 0; +set_param_out: + enabled =3D enable; + return err; } =20 static const struct kernel_param_ops enabled_param_ops =3D { @@ -320,10 +312,11 @@ static int __init damon_lru_sort_init(void) ctx->callback.after_wmarks_check =3D damon_lru_sort_after_wmarks_check; ctx->callback.after_aggregation =3D damon_lru_sort_after_aggregation; =20 - schedule_delayed_work(&damon_lru_sort_timer, 0); + /* 'enabled' has set before this function, probably via command line */ + if (enabled) + err =3D damon_lru_sort_turn(true); =20 - damon_lru_sort_initialized =3D true; - return 0; + return err; } =20 module_init(damon_lru_sort_init); --=20 2.25.1