From nobody Mon Feb 9 11:47:30 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 B46CBC6FD1C for ; Thu, 23 Mar 2023 04:01:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230346AbjCWEBM (ORCPT ); Thu, 23 Mar 2023 00:01:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229955AbjCWEAx (ORCPT ); Thu, 23 Mar 2023 00:00:53 -0400 Received: from mail-pj1-x1049.google.com (mail-pj1-x1049.google.com [IPv6:2607:f8b0:4864:20::1049]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3702E20077 for ; Wed, 22 Mar 2023 21:00:50 -0700 (PDT) Received: by mail-pj1-x1049.google.com with SMTP id b8-20020a17090a488800b0023d1bf65c7eso321934pjh.3 for ; Wed, 22 Mar 2023 21:00:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1679544050; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=9m7S+Ebo8MkLWAncbvKsOW8wVqp1O+0Jr3lM7bEbkLI=; b=VdCCijFiKDJ4yDz8tFMap2tBXNfAakMH2cmowf1HUrZHuzx98c171wgP+Q37bsMmOY dvm3L1704oXKLAgAkOK0GjUnYQoP54+fQujrx3ACvUW9YBMoC0EV4BPolgDqFHWKSqHY vC+M0AbP8Thw306r5f0tU0s0RnClNRrpM7iLZQZCh4urjjm1nPlLVN2cvKbhB0gks3OE JIza4tgsYELq7gTHgeHRM8vhlVtpzgxg6m7gbPXptQ7q4d0Q9K++kyZO3UiZG82ponKY DM+ht1D3A+Eg8Co2dt+ym/gky/eIx2ki3TeVSJ2PxhVMHdlX5/2KaImaACWOeUxKy2jU FXPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679544050; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=9m7S+Ebo8MkLWAncbvKsOW8wVqp1O+0Jr3lM7bEbkLI=; b=o0qFcF7Ja9qH1/eOABAH5KeTpTNOCvqQF0KKNRjZB7Vpuz98hQRNYHlPGFnku3x7N9 5W0kRwWAYsx1qEFlidlNjmQvsnW8qRlXrhXO+R8QZZ8ah4QczPRqbR3JgX1VuaQhlLFz eDurzePWPp2BcB7iEr+UHvSazm/UEfc3a0i39Ci0p8SMAH8FJZP0nWQv6m8Bic1CwZ2z WOchGPJV8lN/7Vt84v80zmjnkphA71dV+FnLowMJv1AOV/z/x6vryDQfNwdwoJrs1Z/f QU5cO3TrozWNh623sJyjnWJeUNF3VcoxXlkACtPk8tgp/rXcWBDjVO/yszIyGaO/BXWB 0GXg== X-Gm-Message-State: AO0yUKVYL3iaoXGRc4Ioo9kH4oIXaD8hzXN8qGUmN9C/7M+/S/hbFJ+W AHqyLKCYUIsiI2F4iS/NriH0AcrEhjmIt6Jb X-Google-Smtp-Source: AK7set+m4AnWZnXPXOtgLtJe2rjiQdXqc3xUA0g5EOBUkvh8xUumZjwEW1aaQclKH89BoDnkrewjWDyAajrYgNTk X-Received: from yosry.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:2327]) (user=yosryahmed job=sendgmr) by 2002:a05:6a00:80e6:b0:623:8a88:1bba with SMTP id ei38-20020a056a0080e600b006238a881bbamr2937696pfb.2.1679544050539; Wed, 22 Mar 2023 21:00:50 -0700 (PDT) Date: Thu, 23 Mar 2023 04:00:35 +0000 In-Reply-To: <20230323040037.2389095-1-yosryahmed@google.com> Mime-Version: 1.0 References: <20230323040037.2389095-1-yosryahmed@google.com> X-Mailer: git-send-email 2.40.0.rc1.284.g88254d51c5-goog Message-ID: <20230323040037.2389095-6-yosryahmed@google.com> Subject: [RFC PATCH 5/7] vmscan: memcg: sleep when flushing stats during reclaim From: Yosry Ahmed To: Tejun Heo , Josef Bacik , Jens Axboe , Zefan Li , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton Cc: Vasily Averin , cgroups@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, Yosry Ahmed Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Memory reclaim should be a sleepable context. Allow sleeping when flushing memcg stats to avoid unnecessarily performing a lot of work without sleeping. This can slow down reclaim code if flushing stats is taking too long, but there is already multiple cond_resched()'s in reclaim code. Signed-off-by: Yosry Ahmed --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 59d1830d08ac..bae35cfb33c8 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2845,7 +2845,7 @@ static void prepare_scan_count(pg_data_t *pgdat, stru= ct scan_control *sc) * Flush the memory cgroup stats, so that we read accurate per-memcg * lruvec stats for heuristics. */ - mem_cgroup_flush_stats(false); + mem_cgroup_flush_stats(true); =20 /* * Determine the scan balance between anon and file LRUs. --=20 2.40.0.rc1.284.g88254d51c5-goog