linux-kernel - Re: [PATCH 07/13] memcontrol: schedule throttling if we are congested

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Message-ID: <20180605204622.GK1351649@devbig577.frc2.facebook.com>
Date:   Tue, 5 Jun 2018 13:46:22 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Josef Bacik <josef@...icpanda.com>
Cc:     axboe@...nel.dk, kernel-team@...com, linux-block@...r.kernel.org,
        akpm@...ux-foundation.org, hannes@...xchg.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 07/13] memcontrol: schedule throttling if we are congested

On Tue, Jun 05, 2018 at 09:29:42AM -0400, Josef Bacik wrote:
> From: Tejun Heo <tj@...nel.org>
> 
> Memory allocations can induce swapping via kswapd or direct reclaim.  If
> we are having IO done for us by kswapd and don't actually go into direct
> reclaim we may never get scheduled for throttling.  So instead check to
> see if our cgroup is congested, and if so schedule the throttling.
> Before we return to user space the throttling stuff will only throttle
> if we actually required it.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun