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Date:   Tue, 23 Oct 2018 12:58:48 -0700
From:   Tejun Heo <>
To:     Michal Hocko <>
Cc:     "David S. Miller" <>,
        Johannes Weiner <>,,, LKML <>,
        Michal Hocko <>
Subject: Re: [RFC PATCH] cgroup, netclassid: add a preemption point to

On Thu, Oct 18, 2018 at 10:56:17AM +0200, Michal Hocko wrote:
> From: Michal Hocko <>
> We have seen a customer complaining about soft lockups on !PREEMPT
> kernel config with 4.4 based kernel
> If a cgroup has many tasks with many open file descriptors then we would
> end up in a large loop without any rescheduling point throught the
> operation. Add cond_resched once per task.
> Signed-off-by: Michal Hocko <>

Applied to cgroup/for-4.20.



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