From: Andrew Morton <akpm@linux-foundation.org>
To: Yosry Ahmed <yosryahmed@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Shakeel Butt <shakeelb@google.com>,
David Rientjes <rientjes@google.com>, Tejun Heo <tj@kernel.org>,
Zefan Li <lizefan.x@bytedance.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
cgroups@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Jonathan Corbet <corbet@lwn.net>, Yu Zhao <yuzhao@google.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Wei Xu <weixugc@google.com>, Greg Thelen <gthelen@google.com>
Subject: Re: [PATCH resend] memcg: introduce per-memcg reclaim interface
Date: Thu, 31 Mar 2022 17:33:50 -0700 [thread overview]
Message-ID: <20220331173350.1fe09370479a4a6f916b477d@linux-foundation.org> (raw)
In-Reply-To: <20220331084151.2600229-1-yosryahmed@google.com>
On Thu, 31 Mar 2022 08:41:51 +0000 Yosry Ahmed <yosryahmed@google.com> wrote:
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -6355,6 +6355,38 @@ static ssize_t memory_oom_group_write(struct kernfs_open_file *of,
> return nbytes;
> }
>
> +static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf,
> + size_t nbytes, loff_t off)
> +{
> + struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
> + unsigned int nr_retries = MAX_RECLAIM_RETRIES;
> + unsigned long nr_to_reclaim, nr_reclaimed = 0;
> + int err;
> +
> + buf = strstrip(buf);
> + err = page_counter_memparse(buf, "", &nr_to_reclaim);
> + if (err)
> + return err;
> +
> + while (nr_reclaimed < nr_to_reclaim) {
> + unsigned long reclaimed;
> +
> + if (signal_pending(current))
> + break;
> +
> + reclaimed = try_to_free_mem_cgroup_pages(memcg,
> + nr_to_reclaim - nr_reclaimed,
> + GFP_KERNEL, true);
> +
> + if (!reclaimed && !nr_retries--)
> + break;
> +
> + nr_reclaimed += reclaimed;
> + }
Is there any way in which this can be provoked into triggering the
softlockup detector?
Is it optimal to do the MAX_RECLAIM_RETRIES loop in the kernel?
Would additional flexibility be gained by letting userspace handle
retrying?
next prev parent reply other threads:[~2022-04-01 0:33 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-31 8:41 [PATCH resend] memcg: introduce per-memcg reclaim interface Yosry Ahmed
2022-03-31 17:25 ` Roman Gushchin
2022-04-01 6:01 ` Wei Xu
2022-04-01 9:11 ` Yosry Ahmed
2022-04-01 18:39 ` Roman Gushchin
2022-04-01 21:13 ` Johannes Weiner
2022-04-01 21:21 ` Roman Gushchin
2022-04-01 21:38 ` Wei Xu
2022-04-01 21:51 ` Johannes Weiner
2022-04-04 17:14 ` Shakeel Butt
2022-04-04 17:13 ` Yosry Ahmed
2022-04-04 17:55 ` Roman Gushchin
2022-04-01 9:15 ` Yosry Ahmed
2022-04-01 15:41 ` Shakeel Butt
2022-04-01 13:49 ` Michal Hocko
2022-04-01 16:58 ` Roman Gushchin
2022-04-04 8:44 ` Michal Hocko
2022-04-04 18:25 ` Roman Gushchin
2022-03-31 19:25 ` Johannes Weiner
2022-04-01 0:33 ` Andrew Morton [this message]
2022-04-01 3:38 ` Wei Xu
2022-04-01 9:17 ` Yosry Ahmed
2022-04-01 13:03 ` Michal Hocko
2022-04-01 3:05 ` Chen Wandun
2022-04-01 9:20 ` Yosry Ahmed
2022-04-01 9:48 ` Chen Wandun
2022-04-01 10:02 ` Yosry Ahmed
2022-04-01 4:05 ` Wei Xu
2022-04-01 9:22 ` Yosry Ahmed
2022-04-01 15:22 ` Johannes Weiner
2022-04-01 20:14 ` Wei Xu
2022-04-01 21:07 ` Johannes Weiner
2022-04-04 17:08 ` Shakeel Butt
2022-04-05 2:30 ` Wei Xu
2022-04-05 10:09 ` Michal Koutný
2022-04-01 8:39 ` Vaibhav Jain
2022-04-01 9:23 ` Yosry Ahmed
2022-04-04 3:50 ` Vaibhav Jain
2022-04-04 17:18 ` Yosry Ahmed
2022-04-01 13:54 ` Michal Hocko
2022-04-01 16:56 ` Wei Xu
2022-04-02 8:13 ` Huang, Ying
2022-04-03 6:46 ` Wei Xu
2022-04-03 6:56 ` Wei Xu
2022-04-06 0:48 ` Huang, Ying
2022-04-06 1:07 ` Wei Xu
2022-04-06 2:49 ` Huang, Ying
2022-04-06 5:02 ` Wei Xu
2022-04-06 6:32 ` Huang, Ying
2022-04-06 7:05 ` Wei Xu
2022-04-06 8:49 ` Huang, Ying
2022-04-06 20:16 ` Wei Xu
2022-04-07 7:35 ` Michal Hocko
2022-04-07 21:26 ` Tim Chen
2022-04-07 22:12 ` Wei Xu
2022-04-07 23:11 ` Tim Chen
2022-04-08 2:10 ` Wei Xu
2022-04-08 3:08 ` Huang, Ying
2022-04-08 4:10 ` Wei Xu
2022-04-04 17:09 ` Yosry Ahmed
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