From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>,
Hugh Dickins <hughd@google.com>,
Richard Davies <richard@arachsys.com>,
Shaohua Li <shli@kernel.org>, Rafael Aquini <aquini@redhat.com>
Subject: Re: [PATCH 1/7] mm: remove ZONE_RECLAIM_LOCKED
Date: Thu, 6 Jun 2013 13:17:14 -0400 [thread overview]
Message-ID: <CAHGf_=pXjSjZLNEDdbet1633cKtdPR6pqgO-WNVeH3DaBbbVGQ@mail.gmail.com> (raw)
In-Reply-To: <0000013f19d7a21d-0bc478a9-c65b-4d66-a774-266b17bcde2a-000000@email.amazonses.com>
> How does nr_to_reclaim limit the concurrency of zone reclaim?
No, it doesn't prevent concurrent reclaim itself. It only prevents cuncurrent
reclaim much much pages rather than SWAP_CLUSTER_MAX. note,
zone reclaim uses priority 4 by default.
> What happens if multiple processes are allocating from the same zone and
> they all go into direct reclaim and therefore hit zone reclaim?
At zone reclaim was created, 16 (1<<4) concurrent reclaim may drop all page
cache because zone reclaim uses priority 4 by default. However, now we have
reckaim bail out logic. So, priority 4 doesn't directly mean each zone reclaim
drop 1/16 caches.
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next prev parent reply other threads:[~2013-06-06 17:17 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-05 15:10 [PATCH 0/7] RFC: adding compaction to zone_reclaim_mode > 0 Andrea Arcangeli
2013-06-05 15:10 ` [PATCH 1/7] mm: remove ZONE_RECLAIM_LOCKED Andrea Arcangeli
2013-06-05 19:23 ` Rik van Riel
2013-06-05 20:37 ` KOSAKI Motohiro
2013-06-05 20:51 ` Christoph Lameter
2013-06-05 21:03 ` KOSAKI Motohiro
2013-06-06 14:15 ` Christoph Lameter
2013-06-06 17:17 ` KOSAKI Motohiro [this message]
2013-06-06 18:16 ` Christoph Lameter
2013-06-05 21:33 ` Rafael Aquini
2013-06-06 9:04 ` Mel Gorman
2013-06-06 17:37 ` Rik van Riel
2013-06-14 16:16 ` Rik van Riel
2013-06-17 9:30 ` Mel Gorman
2013-06-17 18:12 ` Rik van Riel
2013-06-26 20:10 ` Andrea Arcangeli
2013-06-05 15:10 ` [PATCH 2/7] mm: compaction: scan all memory with /proc/sys/vm/compact_memory Andrea Arcangeli
2013-06-05 19:34 ` Rik van Riel
2013-06-05 21:39 ` Rafael Aquini
2013-06-06 9:05 ` Mel Gorman
2013-06-05 15:10 ` [PATCH 3/7] mm: compaction: don't depend on kswapd to invoke reset_isolation_suitable Andrea Arcangeli
2013-06-05 19:49 ` Rik van Riel
2013-06-26 20:38 ` Andrea Arcangeli
2013-06-06 9:11 ` Mel Gorman
2013-06-26 20:48 ` Andrea Arcangeli
2013-06-06 12:47 ` Rafael Aquini
2013-06-05 15:10 ` [PATCH 4/7] mm: compaction: reset before initializing the scan cursors Andrea Arcangeli
2013-06-05 20:04 ` Rik van Riel
2013-06-06 9:14 ` Mel Gorman
2013-06-06 12:49 ` Rafael Aquini
2013-06-05 15:10 ` [PATCH 5/7] mm: compaction: increase the high order pages in the watermarks Andrea Arcangeli
2013-06-05 20:18 ` Rik van Riel
2013-06-28 22:14 ` Andrea Arcangeli
2013-06-06 9:19 ` Mel Gorman
2013-06-05 15:10 ` [PATCH 6/7] mm: compaction: export compact_zone_order() Andrea Arcangeli
2013-06-05 20:24 ` Rik van Riel
2013-06-05 15:10 ` [PATCH 7/7] mm: compaction: add compaction to zone_reclaim_mode Andrea Arcangeli
2013-06-05 22:21 ` Rik van Riel
2013-06-06 10:05 ` Mel Gorman
2013-07-11 16:02 ` Andrea Arcangeli
2013-07-12 12:26 ` Hush Bensen
2013-07-12 16:01 ` Andrea Arcangeli
2013-07-12 23:23 ` Hush Bensen
2013-07-15 9:16 ` Andrea Arcangeli
2013-07-12 23:57 ` Hush Bensen
2013-07-15 9:25 ` Andrea Arcangeli
2013-06-06 8:53 ` [PATCH 0/7] RFC: adding compaction to zone_reclaim_mode > 0 Mel Gorman
2013-06-06 10:09 ` Mel Gorman
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