linux-kernel - Re: [PATCH block/for-next] blk-cgroup: cgroup_rstat

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Date:   Mon, 18 Nov 2019 08:41:14 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Tejun Heo <tj@...nel.org>
Cc:     Faiz Abbas <faiz_abbas@...com>, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        lizefan@...wei.com, hannes@...xchg.org, kernel-team@...com,
        Dan Schatzberg <dschatzberg@...com>, Daniel Xu <dlxu@...com>
Subject: Re: [PATCH block/for-next] blk-cgroup: cgroup_rstat_updated()
 shouldn't be called on cgroup1

On 11/14/19 3:31 PM, Tejun Heo wrote:
> Currently, cgroup rstat is supported only on cgroup2 hierarchy and
> rstat functions shouldn't be called on cgroup1 cgroups.  While
> converting blk-cgroup core statistics to rstat, f73316482977
> ("blk-cgroup: reimplement basic IO stats using cgroup rstat")
> accidentally ended up calling cgroup_rstat_updated() on cgroup1
> cgroups causing crashes.
> 
> Longer term, we probably should add cgroup1 support to rstat but for
> now let's mask the call directly.

Applied, thanks.

-- 
Jens Axboe