From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yosry Ahmed Subject: [PATCH v3 7/8] vmscan: memcg: sleep when flushing stats during reclaim Date: Thu, 30 Mar 2023 19:18:00 +0000 Message-ID: <20230330191801.1967435-8-yosryahmed@google.com> References: <20230330191801.1967435-1-yosryahmed@google.com> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1680203896; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=xcUaqJ6BFfuwa7nRJSvBlAwhhxeRf5mk+29EPOCHz/Q=; b=ltNePRXuZIePvYweAMHUj9ZiAeC5qavTrptvs7HWUZy4ZQjHtls0D9eRHEg0pqkaqA 2rj8RSL+AK/a3iTAV1slsfA/XO8i87DoFdpL6M03j+wstTxD0gNLM1Eo1e2c6UpyLkfA 02M3+F6NXEWgNHJDDpxLzGC2sGDBHCNs+LO2yZgTc79ihpz2oe9Gkrj2oQSZRb8nP/pk DTjpgFJ4LNEzmr5tCkDpR0cOQrENPev1JFpwtylRIUOchlXAi5bgsrxJgKXBgxobydtr bGBrN9gUtdaDKVSRv2j9cJxRBN0C3BLXf8CobNS0sZxfbCzcE+BakwfvTig0jcnVMYxC dA2A== In-Reply-To: <20230330191801.1967435-1-yosryahmed-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org> List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Tejun Heo , Josef Bacik , Jens Axboe , Zefan Li , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , =?UTF-8?q?Michal=20Koutn=C3=BD?= Cc: Vasily Averin , cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, bpf-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Yosry Ahmed , Michal Hocko Memory reclaim is a sleepable context. Flushing is an expensive operaiton that scales with the number of cpus and the number of cgroups in the system, so avoid doing it atomically unnecessarily. 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 Acked-by: Shakeel Butt Acked-by: Johannes Weiner Acked-by: Michal Hocko --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index a9511ccb936f..9c1c5e8b24b8 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2845,7 +2845,7 @@ static void prepare_scan_count(pg_data_t *pgdat, struct scan_control *sc) * Flush the memory cgroup stats, so that we read accurate per-memcg * lruvec stats for heuristics. */ - mem_cgroup_flush_stats_atomic(); + mem_cgroup_flush_stats(); /* * Determine the scan balance between anon and file LRUs. -- 2.40.0.348.gf938b09366-goog