From: Shakeel Butt <shakeelb@google.com>
To: Yosry Ahmed <yosryahmed@google.com>
Cc: Michal Hocko <mhocko@suse.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Andrew Morton <akpm@linux-foundation.org>,
Muchun Song <muchun.song@linux.dev>,
cgroups@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: memcg: provide accurate stats for userspace reads
Date: Fri, 11 Aug 2023 19:29:14 -0700 [thread overview]
Message-ID: <CALvZod46Cz_=5UgiyAKM+VgKyk=KJCqDqXu91=9uHy7-2wk53g@mail.gmail.com> (raw)
In-Reply-To: <CAJD7tkYZxjAHrodVDK=wmz-sULJrq2VhC_5ecRP7T-KiaOcTuw@mail.gmail.com>
On Fri, Aug 11, 2023 at 7:12 PM Yosry Ahmed <yosryahmed@google.com> wrote:
>
[...]
>
> I am worried that writing to a stat for flushing then reading will
> increase the staleness window which we are trying to reduce here.
> Would it be acceptable to add a separate interface to explicitly read
> flushed stats without having to write first? If the distinction
> disappears in the future we can just short-circuit both interfaces.
What is the acceptable staleness time window for your case? It is hard
to imagine that a write+read will always be worse than just a read.
Even the proposed patch can have an unintended and larger than
expected staleness window due to some processing on
return-to-userspace or some scheduling delay.
next prev parent reply other threads:[~2023-08-12 2:29 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-09 4:58 Yosry Ahmed
2023-08-09 8:51 ` Michal Hocko
2023-08-09 12:31 ` Yosry Ahmed
2023-08-09 12:58 ` Michal Hocko
2023-08-09 13:13 ` Yosry Ahmed
2023-08-09 13:31 ` Michal Hocko
2023-08-09 18:33 ` Yosry Ahmed
2023-08-11 12:21 ` Michal Hocko
2023-08-11 19:02 ` Yosry Ahmed
2023-08-11 19:25 ` Michal Hocko
2023-08-11 20:39 ` Yosry Ahmed
2023-08-12 2:08 ` Shakeel Butt
2023-08-12 2:11 ` Yosry Ahmed
2023-08-12 2:29 ` Shakeel Butt [this message]
2023-08-12 2:35 ` Yosry Ahmed
2023-08-12 2:48 ` Shakeel Butt
2023-08-12 8:35 ` Michal Hocko
2023-08-12 11:04 ` Yosry Ahmed
2023-08-15 0:14 ` Tejun Heo
2023-08-15 0:28 ` Yosry Ahmed
2023-08-15 0:35 ` Tejun Heo
2023-08-15 0:39 ` Yosry Ahmed
2023-08-15 0:47 ` Tejun Heo
2023-08-15 0:50 ` Yosry Ahmed
2023-08-16 0:23 ` Shakeel Butt
2023-08-16 0:29 ` Yosry Ahmed
2023-08-16 1:14 ` Shakeel Butt
2023-08-16 2:19 ` Yosry Ahmed
2023-08-16 17:11 ` Shakeel Butt
2023-08-16 19:08 ` Tejun Heo
2023-08-16 22:35 ` Yosry Ahmed
2023-08-18 21:40 ` Yosry Ahmed
2023-08-21 20:58 ` Yosry Ahmed
2023-08-15 15:44 ` Waiman Long
2023-08-09 13:17 ` Yosry Ahmed
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