From: Tejun Heo <tj@kernel.org>
To: Aleksa Sarai <cyphar@cyphar.com>
Cc: Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>,
cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH] cgroup: pids: use {READ,WRITE}_ONCE for pids->limit operations
Date: Mon, 14 Oct 2019 08:41:36 -0700 [thread overview]
Message-ID: <20191014154136.GF18794@devbig004.ftw2.facebook.com> (raw)
In-Reply-To: <20191012010539.6131-1-cyphar@cyphar.com>
On Sat, Oct 12, 2019 at 12:05:39PM +1100, Aleksa Sarai wrote:
> Because pids->limit can be changed concurrently (but we don't want to
> take a lock because it would be needlessly expensive), use the
> appropriate memory barriers.
I can't quite tell what problem it's fixing. Can you elaborate a
scenario where the current code would break that your patch fixes?
Thanks.
--
tejun
next prev parent reply other threads:[~2019-10-14 15:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-12 1:05 [PATCH] cgroup: pids: use {READ,WRITE}_ONCE for pids->limit operations Aleksa Sarai
2019-10-14 15:41 ` Tejun Heo [this message]
2019-10-14 15:59 ` Aleksa Sarai
2019-10-14 16:33 ` Tejun Heo
2019-10-16 8:32 ` Aleksa Sarai
2019-10-16 14:27 ` Tejun Heo
2019-10-16 15:29 ` Aleksa Sarai
2019-10-16 15:32 ` Tejun Heo
2019-10-16 15:35 ` Aleksa Sarai
2019-10-16 15:54 ` Tejun Heo
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