From: Johannes Weiner <hannes@cmpxchg.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Vladimir Davydov <vdavydov@parallels.com>,
Vlastimil Babka <vbabka@suse.cz>, Mel Gorman <mgorman@suse.de>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH 1/2] mm, vmscan: consider isolated pages in zone_reclaimable_pages
Date: Tue, 24 Nov 2015 11:03:52 -0500 [thread overview]
Message-ID: <20151124160352.GA9598@cmpxchg.org> (raw)
In-Reply-To: <1448366100-11023-2-git-send-email-mhocko@kernel.org>
On Tue, Nov 24, 2015 at 12:54:59PM +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
>
> zone_reclaimable_pages counts how many pages are reclaimable in
> the given zone. This currently includes all pages on file lrus and
> anon lrus if there is an available swap storage. We do not consider
> NR_ISOLATED_{ANON,FILE} counters though which is not correct because
> these counters reflect temporarily isolated pages which are still
> reclaimable because they either get back to their LRU or get freed
> either by the page reclaim or page migration.
>
> The number of these pages might be sufficiently high to confuse users of
> zone_reclaimable_pages (e.g. mbind can migrate large ranges of memory at
> once).
>
> Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
> Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
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WARNING: multiple messages have this Message-ID (diff)
From: Johannes Weiner <hannes@cmpxchg.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Vladimir Davydov <vdavydov@parallels.com>,
Vlastimil Babka <vbabka@suse.cz>, Mel Gorman <mgorman@suse.de>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH 1/2] mm, vmscan: consider isolated pages in zone_reclaimable_pages
Date: Tue, 24 Nov 2015 11:03:52 -0500 [thread overview]
Message-ID: <20151124160352.GA9598@cmpxchg.org> (raw)
In-Reply-To: <1448366100-11023-2-git-send-email-mhocko@kernel.org>
On Tue, Nov 24, 2015 at 12:54:59PM +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
>
> zone_reclaimable_pages counts how many pages are reclaimable in
> the given zone. This currently includes all pages on file lrus and
> anon lrus if there is an available swap storage. We do not consider
> NR_ISOLATED_{ANON,FILE} counters though which is not correct because
> these counters reflect temporarily isolated pages which are still
> reclaimable because they either get back to their LRU or get freed
> either by the page reclaim or page migration.
>
> The number of these pages might be sufficiently high to confuse users of
> zone_reclaimable_pages (e.g. mbind can migrate large ranges of memory at
> once).
>
> Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
> Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
next prev parent reply other threads:[~2015-11-24 16:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-24 11:54 [PATCH 0/2] 2 zone_pages_reclaimable fixes Michal Hocko
2015-11-24 11:54 ` Michal Hocko
2015-11-24 11:54 ` [PATCH 1/2] mm, vmscan: consider isolated pages in zone_reclaimable_pages Michal Hocko
2015-11-24 11:54 ` Michal Hocko
2015-11-24 13:53 ` Vladimir Davydov
2015-11-24 13:53 ` Vladimir Davydov
2015-11-24 16:03 ` Johannes Weiner [this message]
2015-11-24 16:03 ` Johannes Weiner
2015-11-25 11:00 ` David Rientjes
2015-11-25 11:00 ` David Rientjes
2015-11-24 11:55 ` [PATCH 2/2] mm, vmscan: do not overestimate anonymous reclaimable pages Michal Hocko
2015-11-24 11:55 ` Michal Hocko
2015-11-24 13:07 ` Vladimir Davydov
2015-11-24 13:07 ` Vladimir Davydov
2015-11-24 13:37 ` Michal Hocko
2015-11-24 13:37 ` Michal Hocko
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