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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 21 Apr 2017 10:52:29 -0700
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Subject: Re: Heads-up: two regressions in v4.11-rc series
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Tariq Toukan <tariqt@mellanox.com>,
        LKML <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>
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On Thu, Apr 20, 2017 at 7:30 AM, Mel Gorman <mgorman@techsingularity.net> wrote:
>> The end result was a revert, and this is waiting in AKPMs quilt queue:
>>  http://ozlabs.org/~akpm/mmots/broken-out/revert-mm-page_alloc-only-use-per-cpu-allocator-for-irq-safe-requests.patch
>>
>
> This was flagged to Andrew that it should go in for either 4.11 or if
> there were concerns about how close to the release we are then put it in
> for 4.11-stable. At worst, I can do a resubmit to -stable myself after
> it gets merged in the next window if it falls between the cracks.

This got merged (commit d34b0733b452: "Revert "mm, page_alloc: only
use per-cpu allocator for irq-safe requests"").

The other issue (caused by commit a499a5a14dbd: "sched/cputime:
Increment kcpustat directly on irqtime account") is still open.

Frederic? Revert? But I guess it's something we can delay for
backporting, it's presumably not possible to hit maliciously except on
some fast local network attacker just causing an effective DoS.

                   Linus