From: Yosry Ahmed <yosryahmed@google.com>
To: "Tejun Heo" <tj@kernel.org>, "Josef Bacik" <josef@toxicpanda.com>,
"Jens Axboe" <axboe@kernel.dk>,
"Zefan Li" <lizefan.x@bytedance.com>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Michal Hocko" <mhocko@kernel.org>,
"Roman Gushchin" <roman.gushchin@linux.dev>,
"Shakeel Butt" <shakeelb@google.com>,
"Muchun Song" <muchun.song@linux.dev>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Michal Koutný" <mkoutny@suse.com>
Cc: Vasily Averin <vasily.averin@linux.dev>,
cgroups@vger.kernel.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
bpf@vger.kernel.org, Yosry Ahmed <yosryahmed@google.com>,
Michal Hocko <mhocko@suse.com>
Subject: [PATCH v3 7/8] vmscan: memcg: sleep when flushing stats during reclaim
Date: Thu, 30 Mar 2023 19:18:00 +0000 [thread overview]
Message-ID: <20230330191801.1967435-8-yosryahmed@google.com> (raw)
In-Reply-To: <20230330191801.1967435-1-yosryahmed@google.com>
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 <yosryahmed@google.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
---
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
next prev parent reply other threads:[~2023-03-30 19:19 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-30 19:17 [PATCH v3 0/8] memcg: avoid flushing stats atomically where possible Yosry Ahmed
2023-03-30 19:17 ` [PATCH v3 1/8] cgroup: rename cgroup_rstat_flush_"irqsafe" to "atomic" Yosry Ahmed
2023-03-30 19:17 ` [PATCH v3 2/8] memcg: rename mem_cgroup_flush_stats_"delayed" to "ratelimited" Yosry Ahmed
2023-03-30 19:17 ` [PATCH v3 3/8] memcg: do not flush stats in irq context Yosry Ahmed
2023-03-30 19:17 ` [PATCH v3 4/8] memcg: replace stats_flush_lock with an atomic Yosry Ahmed
2023-04-04 16:52 ` Michal Koutný
2023-04-04 17:13 ` Shakeel Butt
2023-04-04 17:21 ` Shakeel Butt
2023-04-04 17:32 ` Michal Koutný
2023-03-30 19:17 ` [PATCH v3 5/8] memcg: sleep during flushing stats in safe contexts Yosry Ahmed
2023-03-30 19:30 ` Johannes Weiner
2023-04-04 15:09 ` Johannes Weiner
2023-03-30 19:17 ` [PATCH v3 6/8] workingset: memcg: sleep when flushing stats in workingset_refault() Yosry Ahmed
2023-04-04 16:53 ` Michal Koutný
2023-04-04 18:09 ` Yosry Ahmed
2023-04-05 8:00 ` Michal Koutný
2023-04-05 8:02 ` Yosry Ahmed
2023-03-30 19:18 ` Yosry Ahmed [this message]
2023-03-30 19:18 ` [PATCH v3 8/8] memcg: do not modify rstat tree for zero updates Yosry Ahmed
2023-04-04 16:53 ` Michal Koutný
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230330191801.1967435-8-yosryahmed@google.com \
--to=yosryahmed@google.com \
--cc=akpm@linux-foundation.org \
--cc=axboe@kernel.dk \
--cc=bpf@vger.kernel.org \
--cc=cgroups@vger.kernel.org \
--cc=hannes@cmpxchg.org \
--cc=josef@toxicpanda.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lizefan.x@bytedance.com \
--cc=mhocko@kernel.org \
--cc=mhocko@suse.com \
--cc=mkoutny@suse.com \
--cc=muchun.song@linux.dev \
--cc=roman.gushchin@linux.dev \
--cc=shakeelb@google.com \
--cc=tj@kernel.org \
--cc=vasily.averin@linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).