From nobody Fri Dec 19 07:31:05 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 B8EE0EDE989 for ; Fri, 15 Sep 2023 02:53:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231865AbjIOCxY (ORCPT ); Thu, 14 Sep 2023 22:53:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231758AbjIOCxU (ORCPT ); Thu, 14 Sep 2023 22:53:20 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 447BB2719 for ; Thu, 14 Sep 2023 19:53:11 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 755C8C433C9; Fri, 15 Sep 2023 02:53:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1694746390; bh=54IK7cTm7KTNNX3XLRdWLVNJIup7inyJ/KiBfKYDcxs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eSK3bW5SwDXeS5zPCPPJiBwfd5vAIC7cx1I5DGDc3g1gvuXMCm8OZyYZaFTizCXr6 IGsoW8btGA90xigquM8091rNDyfmkhLNZwW7AIw8V9/opp1tvo1+424tjJaU6cby3j I/vcCzrwXGjBievjJ4k0LmkDlgt7Vpsff/hAU6iCuuvjFBQdjenQIAcfFr6mVvqAxE lvVQoEfYtTh4DFK+Os4lxuxXzBf8ovK+gvvU36ZpNYmDj0Q6OOWQtg+hcgCSutY3O4 y0w09Gspx4AymqefNtFvvOVgLXTTfoD0VfrvZtP6/fxVMSrz1FavT9eJGsqjrrSzLS oT47TwypudG+g== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 7/8] mm/damon/core: skip updating nr_accesses_bp for each aggregation interval Date: Fri, 15 Sep 2023 02:52:50 +0000 Message-Id: <20230915025251.72816-8-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230915025251.72816-1-sj@kernel.org> References: <20230915025251.72816-1-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" damon_merge_regions_of(), which is called for each aggregation interval, updates nr_accesses_bp to nr_accesses * 10000. However, nr_accesses_bp is updated for each sampling interval via damon_moving_sum() using the aggregation interval as the moving time window. And by the definition of the algorithm, the value becomes same to discrete-window based sum for each time window-aligned time. Hence, nr_accesses_bp will be same to nr_accesses * 10000 for each aggregation interval without explicit update. Remove the unnecessary update of nr_accesses_bp in damon_merge_regions_of(). Signed-off-by: SeongJae Park --- mm/damon/core.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 29ee1fc18393..45cc108c0fe1 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1141,8 +1141,6 @@ static void damon_merge_regions_of(struct damon_targe= t *t, unsigned int thres, else r->age++; =20 - r->nr_accesses_bp =3D r->nr_accesses * 10000; - if (prev && prev->ar.end =3D=3D r->ar.start && abs(prev->nr_accesses - r->nr_accesses) <=3D thres && damon_sz_region(prev) + damon_sz_region(r) <=3D sz_limit) --=20 2.25.1