linux-kernel - Re: [RFC PATCH] mm: memcontrol: don't account swap failures not due to cgroup limits

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Message-ID: <Y91eRKKutWBZwmSG@P9FQF9L96D.corp.robot.car>
Date:   Fri, 3 Feb 2023 11:19:32 -0800
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     Yang Shi <shy828301@...il.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        Shakeel Butt <shakeelb@...gle.com>, Tejun Heo <tj@...nel.org>,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Christian Brauner <brauner@...nel.org>
Subject: Re: [RFC PATCH] mm: memcontrol: don't account swap failures not due
 to cgroup limits

On Fri, Feb 03, 2023 at 11:07:30AM -0800, Yang Shi wrote:
> On Fri, Feb 3, 2023 at 11:00 AM Roman Gushchin <roman.gushchin@...ux.dev> wrote:
> >
> > On Thu, Feb 02, 2023 at 10:56:26AM -0500, Johannes Weiner wrote:
> > > Christian reports the following situation in a cgroup that doesn't
> > > have memory.swap.max configured:
> > >
> > >   $ cat memory.swap.events
> > >   high 0
> > >   max 0
> > >   fail 6218
> > >
> > > Upon closer examination, this is an ARM64 machine that doesn't support
> > > swapping out THPs.
> >
> > Do we expect it to be added any time soon or it's caused by some system
> > limitations?
> 
> AFAIK, it has been supported since 6.0. See commit d0637c505f8a1

Great, thank you for the link!
Then it looks like we have even fewer reasons to change the interface.

Thanks!