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From: Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH 2/6] mm: vmstat: move slab statistics from zone to node counters
In-Reply-To: <20170531171151.e4zh7ffzbl4w33gd@yury-thinkpad>
References: <20170530181724.27197-1-hannes@cmpxchg.org> <20170530181724.27197-3-hannes@cmpxchg.org> <20170531091256.GA5914@osiris> <20170531113900.GB5914@osiris> <20170531171151.e4zh7ffzbl4w33gd@yury-thinkpad>
Date: Thu, 01 Jun 2017 20:07:28 +1000
Message-ID: <87mv9s2f8f.fsf@concordia.ellerman.id.au>
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To: Yury Norov <ynorov@caviumnetworks.com>, Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>, Josef Bacik <josef@toxicpanda.com>, Michal Hocko <mhocko@suse.com>, Vladimir Davydov <vdavydov.dev@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Rik van Riel <riel@redhat.com>, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com, linux-s390@vger.kernel.org

Yury Norov <ynorov@caviumnetworks.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@cmpxchg.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

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