From: Rik van Riel <riel@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Larry Woodman <lwoodman@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: [PATCH 2/4] tracing, mm: Add trace events for anti-fragmentation falling back to other migratetypes
Date: Wed, 29 Jul 2009 21:39:53 -0400 [thread overview]
Message-ID: <4A70F9E9.5000007@redhat.com> (raw)
In-Reply-To: <1248901551-7072-3-git-send-email-mel@csn.ul.ie>
Mel Gorman wrote:
> Fragmentation avoidance depends on being able to use free pages from
> lists of the appropriate migrate type. In the event this is not
> possible, __rmqueue_fallback() selects a different list and in some
> circumstances change the migratetype of the pageblock. Simplistically,
> the more times this event occurs, the more likely that fragmentation
> will be a problem later for hugepage allocation at least but there are
> other considerations such as the order of page being split to satisfy
> the allocation.
Acked-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2009-07-30 1:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-29 21:05 [RFC PATCH 0/4] Add some trace events for the page allocator v2 Mel Gorman
2009-07-29 21:05 ` [PATCH 1/4] tracing, page-allocator: Add trace events for page allocation and page freeing Mel Gorman
2009-07-30 0:55 ` Rik van Riel
2009-07-29 21:05 ` [PATCH 2/4] tracing, mm: Add trace events for anti-fragmentation falling back to other migratetypes Mel Gorman
2009-07-30 1:39 ` Rik van Riel [this message]
2009-07-29 21:05 ` [PATCH 3/4] tracing, page-allocator: Add trace event for page traffic related to the buddy lists Mel Gorman
2009-07-30 13:43 ` Rik van Riel
2009-07-29 21:05 ` [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events Mel Gorman
2009-07-30 13:45 ` Rik van Riel
-- strict thread matches above, loose matches on Subject: below --
2009-08-04 18:12 [PATCH 0/4] Add some trace events for the page allocator v3 Mel Gorman
2009-08-04 18:12 ` [PATCH 2/4] tracing, mm: Add trace events for anti-fragmentation falling back to other migratetypes Mel Gorman
2009-08-05 9:26 ` KOSAKI Motohiro
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