From: Mel Gorman <mel@csn.ul.ie>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Linux Memory Management List <linux-mm@kvack.org>,
Christoph Lameter <cl@linux-foundation.org>,
Nick Piggin <npiggin@suse.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Lin Ming <ming.m.lin@intel.com>,
Zhang Yanmin <yanmin_zhang@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 05/25] Break up the allocator entry point into fast and slow paths
Date: Tue, 21 Apr 2009 10:30:16 +0100 [thread overview]
Message-ID: <20090421093015.GK12713@csn.ul.ie> (raw)
In-Reply-To: <1240297984.771.24.camel@penberg-laptop>
On Tue, Apr 21, 2009 at 10:13:04AM +0300, Pekka Enberg wrote:
> Hi!
>
> On Tue, 2009-04-21 at 15:35 +0900, KOSAKI Motohiro wrote:
> > > The core of the page allocator is one giant function which allocates memory
> > > on the stack and makes calculations that may not be needed for every
> > > allocation. This patch breaks up the allocator path into fast and slow
> > > paths for clarity. Note the slow paths are still inlined but the entry is
> > > marked unlikely. If they were not inlined, it actally increases text size
> > > to generate the as there is only one call site.
> >
> > hmm..
> >
> > this patch have few behavior change.
> > please separate big cleanup patch and behavior patch.
> >
> > I hope to make this patch non functional change. I'm not sure about these
> > are your intentional change or not. it cause harder reviewing...
>
> Agreed, splitting this patch into smaller chunks would make it easier to review.
>
Chunking this doesn't make it easier to review. As it is, it's possible
to go through the old path once and compare it to the new path. I had
this split out at one time, but it meant comparing old and new paths
multiple times instead of once.
However, there were functional changes in here and they needed to be
taken out.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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next prev parent reply other threads:[~2009-04-21 9:29 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-20 22:19 [PATCH 00/25] Cleanup and optimise the page allocator V6 Mel Gorman
2009-04-20 22:19 ` [PATCH 01/25] Replace __alloc_pages_internal() with __alloc_pages_nodemask() Mel Gorman
2009-04-21 1:44 ` KOSAKI Motohiro
2009-04-21 5:55 ` Pekka Enberg
2009-04-20 22:19 ` [PATCH 02/25] Do not sanity check order in the fast path Mel Gorman
2009-04-21 1:45 ` KOSAKI Motohiro
2009-04-21 5:55 ` Pekka Enberg
2009-04-20 22:19 ` [PATCH 03/25] Do not check NUMA node ID when the caller knows the node is valid Mel Gorman
2009-04-21 2:44 ` KOSAKI Motohiro
2009-04-21 6:00 ` Pekka Enberg
2009-04-21 6:33 ` Paul Mundt
2009-04-20 22:19 ` [PATCH 04/25] Check only once if the zonelist is suitable for the allocation Mel Gorman
2009-04-21 3:03 ` KOSAKI Motohiro
2009-04-21 7:09 ` Pekka Enberg
2009-04-20 22:19 ` [PATCH 05/25] Break up the allocator entry point into fast and slow paths Mel Gorman
2009-04-21 6:35 ` KOSAKI Motohiro
2009-04-21 7:13 ` Pekka Enberg
2009-04-21 9:30 ` Mel Gorman [this message]
2009-04-21 9:29 ` Mel Gorman
2009-04-21 10:44 ` KOSAKI Motohiro
2009-04-20 22:19 ` [PATCH 06/25] Move check for disabled anti-fragmentation out of fastpath Mel Gorman
2009-04-21 6:37 ` KOSAKI Motohiro
2009-04-20 22:19 ` [PATCH 07/25] Check in advance if the zonelist needs additional filtering Mel Gorman
2009-04-21 6:52 ` KOSAKI Motohiro
2009-04-21 9:47 ` Mel Gorman
2009-04-21 7:21 ` Pekka Enberg
2009-04-21 9:49 ` Mel Gorman
2009-04-20 22:19 ` [PATCH 08/25] Calculate the preferred zone for allocation only once Mel Gorman
2009-04-21 7:03 ` KOSAKI Motohiro
2009-04-21 8:23 ` Mel Gorman
2009-04-21 7:37 ` Pekka Enberg
2009-04-21 8:27 ` Mel Gorman
2009-04-21 8:29 ` Pekka Enberg
2009-04-20 22:19 ` [PATCH 09/25] Calculate the migratetype " Mel Gorman
2009-04-21 7:37 ` KOSAKI Motohiro
2009-04-21 8:35 ` Mel Gorman
2009-04-21 10:19 ` KOSAKI Motohiro
2009-04-21 10:30 ` Mel Gorman
2009-04-20 22:19 ` [PATCH 10/25] Calculate the alloc_flags " Mel Gorman
2009-04-21 9:03 ` KOSAKI Motohiro
2009-04-21 10:05 ` Mel Gorman
2009-04-21 10:12 ` KOSAKI Motohiro
2009-04-21 10:37 ` Mel Gorman
2009-04-21 10:40 ` KOSAKI Motohiro
2009-04-20 22:19 ` [PATCH 11/25] Calculate the cold parameter " Mel Gorman
2009-04-21 7:43 ` Pekka Enberg
2009-04-21 8:41 ` Mel Gorman
2009-04-21 9:07 ` KOSAKI Motohiro
2009-04-21 10:08 ` Mel Gorman
2009-04-21 14:59 ` Christoph Lameter
2009-04-21 14:58 ` Christoph Lameter
2009-04-20 22:19 ` [PATCH 12/25] Remove a branch by assuming __GFP_HIGH == ALLOC_HIGH Mel Gorman
2009-04-21 7:46 ` Pekka Enberg
2009-04-21 8:45 ` Mel Gorman
2009-04-21 10:25 ` Pekka Enberg
2009-04-21 9:08 ` KOSAKI Motohiro
2009-04-21 10:31 ` KOSAKI Motohiro
2009-04-21 10:43 ` Mel Gorman
2009-04-20 22:19 ` [PATCH 13/25] Inline __rmqueue_smallest() Mel Gorman
2009-04-21 7:58 ` Pekka Enberg
2009-04-21 8:48 ` Mel Gorman
2009-04-21 9:52 ` KOSAKI Motohiro
2009-04-21 10:11 ` Mel Gorman
2009-04-21 10:22 ` KOSAKI Motohiro
2009-04-20 22:20 ` [PATCH 14/25] Inline buffered_rmqueue() Mel Gorman
2009-04-21 9:56 ` KOSAKI Motohiro
2009-04-20 22:20 ` [PATCH 15/25] Inline __rmqueue_fallback() Mel Gorman
2009-04-21 9:56 ` KOSAKI Motohiro
2009-04-20 22:20 ` [PATCH 16/25] Save text by reducing call sites of __rmqueue() Mel Gorman
2009-04-21 10:47 ` KOSAKI Motohiro
2009-04-20 22:20 ` [PATCH 17/25] Do not call get_pageblock_migratetype() more than necessary Mel Gorman
2009-04-21 11:03 ` KOSAKI Motohiro
2009-04-21 16:12 ` Mel Gorman
2009-04-22 2:25 ` KOSAKI Motohiro
2009-04-20 22:20 ` [PATCH 18/25] Do not disable interrupts in free_page_mlock() Mel Gorman
2009-04-21 7:55 ` Pekka Enberg
2009-04-21 8:50 ` Mel Gorman
2009-04-21 15:05 ` Christoph Lameter
2009-04-22 0:13 ` KOSAKI Motohiro
2009-04-22 14:43 ` Lee Schermerhorn
2009-04-20 22:20 ` [PATCH 19/25] Do not setup zonelist cache when there is only one node Mel Gorman
2009-04-20 22:20 ` [PATCH 20/25] Do not check for compound pages during the page allocator sanity checks Mel Gorman
2009-04-22 0:20 ` KOSAKI Motohiro
2009-04-22 10:09 ` Mel Gorman
2009-04-22 10:41 ` KOSAKI Motohiro
2009-04-20 22:20 ` [PATCH 21/25] Use allocation flags as an index to the zone watermark Mel Gorman
2009-04-22 0:26 ` KOSAKI Motohiro
2009-04-22 0:41 ` David Rientjes
2009-04-22 10:21 ` Mel Gorman
2009-04-22 10:23 ` Mel Gorman
2009-04-20 22:20 ` [PATCH 22/25] Update NR_FREE_PAGES only as necessary Mel Gorman
2009-04-22 0:35 ` KOSAKI Motohiro
2009-04-20 22:20 ` [PATCH 23/25] Get the pageblock migratetype without disabling interrupts Mel Gorman
2009-04-20 22:20 ` [PATCH 24/25] Re-sort GFP flags and fix whitespace alignment for easier reading Mel Gorman
2009-04-21 8:04 ` Pekka Enberg
2009-04-21 8:52 ` Mel Gorman
2009-04-21 15:08 ` Christoph Lameter
2009-04-21 15:24 ` Mel Gorman
2009-04-20 22:20 ` [PATCH 25/25] Use a pre-calculated value instead of num_online_nodes() in fast paths Mel Gorman
2009-04-21 8:08 ` Pekka Enberg
2009-04-21 9:01 ` Mel Gorman
2009-04-21 15:09 ` Christoph Lameter
2009-04-21 8:13 ` [PATCH 00/25] Cleanup and optimise the page allocator V6 Pekka Enberg
2009-04-22 14:13 ` Mel Gorman
-- strict thread matches above, loose matches on Subject: below --
2009-03-20 10:02 [PATCH 00/25] Cleanup and optimise the page allocator V5 Mel Gorman
2009-03-20 10:02 ` [PATCH 05/25] Break up the allocator entry point into fast and slow paths Mel Gorman
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