From: "Michal Koutný" <mkoutny@suse.com>
To: Yosry Ahmed <yosryahmed@google.com>
Cc: 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>,
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, Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH v3 6/8] workingset: memcg: sleep when flushing stats in workingset_refault()
Date: Wed, 5 Apr 2023 10:00:47 +0200 [thread overview]
Message-ID: <20230405080047.5omnatjbwz46f3y5@blackpad> (raw)
In-Reply-To: <CAJD7tkb-0rXL9V2TX-Ax-3OkwJPYx_GaOT4D=VCA60riit+dOw@mail.gmail.com>
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On Tue, Apr 04, 2023 at 11:09:02AM -0700, Yosry Ahmed <yosryahmed@google.com> wrote:
> IIUC there are multiple places where we can sleep in this path, we can
> sleep waiting for a page to be read from disk, we can sleep during
> allocating the page to read into, and IIUC the allocations on the
> fault path can even run into reclaim, going into the vmscan code. So
> there are precedents, but I am not sure if that's enough argument.
I expect it'd depend on the proportion of the slow/fast paths.
OK, let's see how it turns out in wider population.
Thanks,
Michal
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next prev parent reply other threads:[~2023-04-05 8:00 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 [this message]
2023-04-05 8:02 ` Yosry Ahmed
2023-03-30 19:18 ` [PATCH v3 7/8] vmscan: memcg: sleep when flushing stats during reclaim Yosry Ahmed
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
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