linux-kernel - Re: [PATCH 2/6] mm: vmstat: move slab statistics from zone to node counters

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Message-ID: <87mv9s2f8f.fsf@concordia.ellerman.id.au>
Date:   Thu, 01 Jun 2017 20:07:28 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Yury Norov <ynorov@...iumnetworks.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Josef Bacik <josef@...icpanda.com>,
        Michal Hocko <mhocko@...e.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, linux-s390@...r.kernel.org
Subject: Re: [PATCH 2/6] mm: vmstat: move slab statistics from zone to node counters

Yury Norov <ynorov@...iumnetworks.com> writes:

> On Wed, May 31, 2017 at 01:39:00PM +0200, Heiko Carstens wrote:
>> On Wed, May 31, 2017 at 11:12:56AM +0200, Heiko Carstens wrote:
>> > On Tue, May 30, 2017 at 02:17:20PM -0400, Johannes Weiner wrote:
>> > > To re-implement slab cache vs. page cache balancing, we'll need the
>> > > slab counters at the lruvec level, which, ever since lru reclaim was
>> > > moved from the zone to the node, is the intersection of the node, not
>> > > the zone, and the memcg.
>> > > 
>> > > We could retain the per-zone counters for when the page allocator
>> > > dumps its memory information on failures, and have counters on both
>> > > levels - which on all but NUMA node 0 is usually redundant. But let's
>> > > keep it simple for now and just move them. If anybody complains we can
>> > > restore the per-zone counters.
>> > > 
>> > > Signed-off-by: Johannes Weiner <hannes@...xchg.org>
>> > 
>> > This patch causes an early boot crash on s390 (linux-next as of today).
>> > CONFIG_NUMA on/off doesn't make any difference. I haven't looked any
>> > further into this yet, maybe you have an idea?
>
> The same on arm64.

And powerpc.

cheers