linux-kernel - Re: [PATCH v1 0/3] cgroup/rstat: global cgroup_rstat

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Date: Tue, 16 Apr 2024 11:38:00 -1000
From: Tejun Heo <tj@...nel.org>
To: Jesper Dangaard Brouer <hawk@...nel.org>
Cc: hannes@...xchg.org, lizefan.x@...edance.com, cgroups@...r.kernel.org,
	yosryahmed@...gle.com, longman@...hat.com, netdev@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	shakeel.butt@...ux.dev, kernel-team@...udflare.com,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	mhocko@...nel.org
Subject: Re: [PATCH v1 0/3] cgroup/rstat: global cgroup_rstat_lock changes

On Tue, Apr 16, 2024 at 07:51:19PM +0200, Jesper Dangaard Brouer wrote:
> This patchset is focused on the global cgroup_rstat_lock.
> 
>  Patch-1: Adds tracepoints to improve measuring lock behavior.
>  Patch-2: Converts the global lock into a mutex.
>  Patch-3: Limits userspace triggered pressure on the lock.

Imma wait for people's inputs on patch 2 and 3. ISTR switching the lock to
mutex made some tail latencies really bad for some workloads at google?
Yosry, was that you?

Thanks.

-- 
tejun