From: Andrew Morton <akpm@linux-foundation.org>
To: Hugh Dickins <hughd@google.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>, linux-mm@kvack.org
Subject: Re: [PATCH 3/3] mm: take pagevecs off reclaim stack
Date: Thu, 29 Dec 2011 14:55:48 -0800 [thread overview]
Message-ID: <20111229145548.e34cb2f3.akpm@linux-foundation.org> (raw)
In-Reply-To: <alpine.LSU.2.00.1112282037000.1362@eggly.anvils>
On Wed, 28 Dec 2011 20:39:36 -0800 (PST)
Hugh Dickins <hughd@google.com> wrote:
> Replace pagevecs in putback_lru_pages() and move_active_pages_to_lru()
> by lists of pages_to_free
One effect of the pagevec handling was to limit lru_lock hold times and
interrupt-disabled times.
This patch removes that upper bound and has the potential to cause
various latency problems when processing large numbers of pages.
The affected functions have rather a lot of callers. I don't think
that auditing all these callers and convincing ourselves that none of
them pass in 10,000 pages is sufficient, because that doesn't prevent us
from introducing such latency problems as the MM code evolves.
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next prev parent reply other threads:[~2011-12-29 22:55 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-29 4:32 [PATCH 0/3] mm: three minor vmscan improvements Hugh Dickins
2011-12-29 4:35 ` [PATCH 1/3] mm: test PageSwapBacked in lumpy reclaim Hugh Dickins
2011-12-29 5:06 ` KOSAKI Motohiro
2012-01-04 1:23 ` Minchan Kim
2012-01-05 6:03 ` KAMEZAWA Hiroyuki
2011-12-29 4:36 ` [PATCH 2/3] mm: cond_resched in scan_mapping_unevictable_pages Hugh Dickins
2011-12-29 5:14 ` KOSAKI Motohiro
2011-12-29 5:48 ` Hugh Dickins
2011-12-29 22:46 ` Hugh Dickins
2011-12-29 4:39 ` [PATCH 3/3] mm: take pagevecs off reclaim stack Hugh Dickins
2011-12-29 5:42 ` KOSAKI Motohiro
2011-12-29 11:18 ` Konstantin Khlebnikov
2011-12-29 22:20 ` Hugh Dickins
2011-12-29 22:55 ` Andrew Morton [this message]
2011-12-29 23:27 ` Hugh Dickins
2011-12-30 0:24 ` KOSAKI Motohiro
2011-12-30 1:55 ` Hugh Dickins
2011-12-30 3:59 ` Andrew Morton
2011-12-30 15:51 ` Mel Gorman
2012-01-01 7:18 ` Hugh Dickins
2012-01-03 23:12 ` Andrew Morton
2012-01-03 23:17 ` KOSAKI Motohiro
2012-01-03 23:29 ` Andrew Morton
2012-01-04 0:03 ` KOSAKI Motohiro
2012-01-04 3:22 ` Hugh Dickins
2012-01-04 20:20 ` Andrew Morton
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