From: Mel Gorman <mgorman@suse.de>
To: Linux-MM <linux-mm@kvack.org>
Cc: Linux-FSDevel <linux-fsdevel@vger.kernel.org>
Subject: [PATCH 00/16] Misc page alloc, shmem and mark_page_accessed optimisations
Date: Fri, 18 Apr 2014 15:50:27 +0100 [thread overview]
Message-ID: <1397832643-14275-1-git-send-email-mgorman@suse.de> (raw)
I was investigating a performance bug that looked like dd to tmpfs
had regressed. The bulk of the problem turned out to be a difference
in Kconfig but it got me looking at the unnecessary overhead in tmpfs,
mark_page_accessed and parts of the allocator. This series is the result.
The primary test workload was dd to a tmpfs file that was 1/10th the size
of memory so that dirty balancing and reclaim should not be factors.
loopdd Throughput
3.15.0-rc1 3.15.0-rc1
vanilla microopt-v1r11
Min 3993.6000 ( 0.00%) 4096.0000 ( 2.56%)
Mean 4766.7200 ( 0.00%) 4896.4267 ( 2.72%)
Stddev 164.5053 ( 0.00%) 167.7316 ( 1.96%)
Max 4812.8000 ( 0.00%) 5120.0000 ( 6.38%)
Respectable increase in throughput. The figures are misleading though because
dd reports in GB/sec so there is a lot of noise. The actual time to completiono
is easier to see
loopdd Time
3.15.0-rc1 3.15.0-rc1
vanilla microopt-v1r11
Min time0.3521 ( 0.00%)0.3317 ( 5.80%)
Mean time0.3570 ( 0.00%)0.3458 ( 3.14%)
Stddev time0.0140 ( 0.00%)0.0112 ( 20.59%)
Max time0.4230 ( 0.00%)0.4083 ( 3.49%)
The time to dd the data is noticably reduced
3.15.0-rc1 3.15.0-rc1
vanillamicroopt-v1r11
User 10.86 10.78
System 70.21 67.12
Elapsed 92.43 89.42
And the system CPU overhead is lower.
A series of tests against various filesystems as well as a general
benchmark are still running but I thought I would send the series out
as-is for comment.
Documentation/sysctl/vm.txt | 17 ++--
arch/ia64/include/asm/topology.h | 3 +-
arch/powerpc/include/asm/topology.h | 8 +-
include/linux/cpuset.h | 29 +++++++
include/linux/mmzone.h | 14 ++-
include/linux/page-flags.h | 2 +
include/linux/pageblock-flags.h | 18 +++-
include/linux/swap.h | 7 +-
include/linux/topology.h | 3 +-
kernel/cpuset.c | 8 +-
mm/filemap.c | 58 ++++++++-----
mm/page_alloc.c | 164 ++++++++++++++++++++----------------
mm/shmem.c | 8 +-
mm/swap.c | 13 ++-
14 files changed, 226 insertions(+), 126 deletions(-)
--
1.8.4.5
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next reply other threads:[~2014-04-18 14:50 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-18 14:50 Mel Gorman [this message]
2014-04-18 14:50 ` [PATCH 01/16] mm: Disable zone_reclaim_mode by default Mel Gorman
2014-04-18 17:26 ` Andi Kleen
2014-04-18 21:15 ` Dave Hansen
2014-04-18 14:50 ` [PATCH 02/16] mm: page_alloc: Do not cache reclaim distances Mel Gorman
2014-04-18 14:50 ` [PATCH 03/16] mm: page_alloc: Do not update zlc unless the zlc is active Mel Gorman
2014-04-18 17:52 ` Johannes Weiner
2014-04-18 14:50 ` [PATCH 04/16] mm: page_alloc: Do not treat a zone that cannot be used for dirty pages as "full" Mel Gorman
2014-04-18 17:52 ` Johannes Weiner
2014-04-18 14:50 ` [PATCH 05/16] mm: page_alloc: Use jump labels to avoid checking number_of_cpusets Mel Gorman
2014-04-18 14:50 ` [PATCH 06/16] mm: page_alloc: Calculate classzone_idx once from the zonelist ref Mel Gorman
2014-04-18 18:03 ` Johannes Weiner
2014-04-19 11:18 ` Mel Gorman
2014-04-18 14:50 ` [PATCH 07/16] mm: page_alloc: Only check the zone id check if pages are buddies Mel Gorman
2014-04-18 18:05 ` Johannes Weiner
2014-04-18 14:50 ` [PATCH 08/16] mm: page_alloc: Only check the alloc flags and gfp_mask for dirty once Mel Gorman
2014-04-18 18:08 ` Johannes Weiner
2014-04-19 11:19 ` Mel Gorman
2014-04-18 14:50 ` [PATCH 09/16] mm: page_alloc: Take the ALLOC_NO_WATERMARK check out of the fast path Mel Gorman
2014-04-18 18:10 ` Johannes Weiner
2014-04-18 14:50 ` [PATCH 10/16] mm: page_alloc: Use word-based accesses for get/set pageblock bitmaps Mel Gorman
2014-04-18 17:16 ` Vlastimil Babka
2014-04-18 14:50 ` [PATCH 11/16] mm: page_alloc: Reduce number of times page_to_pfn is called Mel Gorman
2014-04-18 14:50 ` [PATCH 12/16] mm: shmem: Avoid atomic operation during shmem_getpage_gfp Mel Gorman
2014-04-18 18:13 ` Johannes Weiner
2014-04-18 14:50 ` [PATCH 13/16] mm: Do not use atomic operations when releasing pages Mel Gorman
2014-04-18 14:50 ` [PATCH 14/16] mm: Do not use unnecessary atomic operations when adding pages to the LRU Mel Gorman
2014-04-18 14:50 ` [PATCH 15/16] mm: Non-atomically mark page accessed in write_begin where possible Mel Gorman
2014-04-18 14:50 ` [PATCH 16/16] mm: filemap: Prefetch page->flags if !PageUptodate Mel Gorman
2014-04-18 19:16 ` Hugh Dickins
2014-04-19 11:23 ` Mel Gorman
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