From nobody Thu Sep 11 20:36:46 2025 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 7ABBFC001B0 for ; Mon, 7 Aug 2023 09:45:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231656AbjHGJpB (ORCPT ); Mon, 7 Aug 2023 05:45:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35258 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229977AbjHGJo7 (ORCPT ); Mon, 7 Aug 2023 05:44:59 -0400 Received: from mail-pl1-x629.google.com (mail-pl1-x629.google.com [IPv6:2607:f8b0:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B54195 for ; Mon, 7 Aug 2023 02:44:58 -0700 (PDT) Received: by mail-pl1-x629.google.com with SMTP id d9443c01a7336-1bc6bfc4b58so3849595ad.1 for ; Mon, 07 Aug 2023 02:44:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1691401498; x=1692006298; h=message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=MkUdmOsdanYJRPaOBW+Sf9SKg08UmbFYSf2hDRsm7Ew=; b=J9pgGgRPpqHlck1+0KnoJkG88FkDuJlHW5sLQ9r8MVmOhil5QYz/fhfhzEOSPMI28R i3clEExQpgGOf/DVuEkNsFeViQfeNSSiDAllWffOjOFiD0fKk/ClwukylBnoZWKJqt1c u+fPX9F0YS+1cchDFZwpBysy8iILSJqaf+Ny8ER/J4XfqYwDb4kyNAfG1UEkY2JubGlD KaEtpKiTaavV1zx4Kz2ghyFotC6weGlY1sk6dW3M6dt14JjsnvrMfQlBTN3uxIlDQAIp nKru/lUhoHZs6qjO/DR1xJc8AhPyQjioBdo5TDLJv5nka35WsXlFqJsSmkc7TCl7Asm6 ZyWQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691401498; x=1692006298; h=message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=MkUdmOsdanYJRPaOBW+Sf9SKg08UmbFYSf2hDRsm7Ew=; b=gLqknskazrWYa06jlssfnOlyYw4GTBBAOUB9T18oTbu9r46297Z2MeGXJ+5zujIMZQ 7FPyMNVA2npKxOSlU8hvScYnPpDRgJoC9Krb6UoiEsOVBa6ixbNwjdo4cZUPlK9gUsqq pnqUCSXRCRIv5c5pRpxRA+KHTvaS6y/Ug6TyuZA+7ijFvT0tmui2NDUWfVtJbV0BKgBc Cl13FAYVUzmPRIKDR96bdrrUV4MQC4kwJAvV2/pONCiBKOWmCMfyKJ0Y7qMgbLs/Me0A PXddjIBoiCSOAVuqnDakx3WDy+TAyHAuR40FeiiYsgfPTBKMVN+pbTz3v956cJeIo3bt N9zA== X-Gm-Message-State: AOJu0YwgTl28Ao8vVtCsBX5dcaZF1Q/hS08i1jnUNY6WtfpS3M2NOsrs jAHGihaGPe/LQ2abrO/4Gqqj7kgacAb123mh X-Google-Smtp-Source: AGHT+IEd7cs63rRKy5qAJS39wV13USrhwp2ni+AteUU85QcEbpUv2VW2KfMRQ3pMCfSHmJu3iWkvgg== X-Received: by 2002:a17:902:e5c2:b0:1bc:5e50:9345 with SMTP id u2-20020a170902e5c200b001bc5e509345mr3893259plf.50.1691401498021; Mon, 07 Aug 2023 02:44:58 -0700 (PDT) Received: from localhost.localdomain ([1.237.29.215]) by smtp.gmail.com with ESMTPSA id ji5-20020a170903324500b001bc445e249asm6424809plb.124.2023.08.07.02.44.55 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Aug 2023 02:44:57 -0700 (PDT) From: Hyeongtak Ji To: sj@kernel.org, akpm@linux-foundation.org Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hyeongtak Ji , Hyeongtak Ji Subject: [PATCH] mm/damon: Prevent unnecessary age reset for regions Date: Mon, 7 Aug 2023 18:44:35 +0900 Message-Id: <1691401475-3796-1-git-send-email-hyeongtak.ji@gmail.com> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" DAMON resets the age of each region after applying each scheme, regardless of whether the scheme has been successfully applied. This patch adds a simple condition to prevent the age of regions from being reset when schemes have not been actually applied. Signed-off-by: Hyeongtak Ji --- mm/damon/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 91cff7f2997e..4044fcf18ac1 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -908,7 +908,7 @@ static void damos_apply_scheme(struct damon_ctx *c, str= uct damon_target *t, quota->charge_addr_from =3D r->ar.end + 1; } } - if (s->action !=3D DAMOS_STAT) + if (s->action !=3D DAMOS_STAT && sz_applied > 0) r->age =3D 0; =20 update_stat: --=20 2.7.4