From: Wu Fengguang <fengguang.wu@intel.com>
To: Iram Shahzad <iram.shahzad@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>, Mel Gorman <mel@csn.ul.ie>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: compaction: trying to understand the code
Date: Fri, 20 Aug 2010 13:34:47 +0800 [thread overview]
Message-ID: <20100820053447.GA13406@localhost> (raw)
In-Reply-To: <AA3F2D89535A431DB91FE3032EDCB9EA@rainbow>
You do run lots of tasks: kernel_stack=1880kB.
And you have lots of free memory, page reclaim has never run, so
inactive_anon=0. This is where compaction is different from vmscan.
In vmscan, inactive_anon is reasonably large, and will only be
compared directly with isolated_anon.
Thanks,
Fengguang
On Fri, Aug 20, 2010 at 01:31:03PM +0800, Iram Shahzad wrote:
> > Could you apply below patch for debugging and report it?
>
> The Mem-info gets printed forever. So I have picked the first 2 of them
> and then another 2 after some time. These 4 Mem-infos are shown in
> the attached log.
>
> Thanks
> Iram
> Mem-info:
> Normal per-cpu:
> CPU 0: hi: 186, btch: 31 usd: 184
> active_anon:40345 inactive_anon:0 isolated_anon:8549
> active_file:2713 inactive_file:10418 isolated_file:1871
> unevictable:0 dirty:0 writeback:0 unstable:0
> free:53713 slab_reclaimable:533 slab_unreclaimable:1076
> mapped:9461 shmem:2349 pagetables:1574 bounce:0
> Normal free:214852kB min:2884kB low:3604kB high:4324kB active_anon:161380kB inactive_anon:0kB active_file:10852kB inactive_file:41672kB unevictable:0kB isolated(anon):34196kB isolated(file):7484kB present:520192kB mlocked:0kB dirty:0kB writeback:0kB mapped:37844kB shmem:9396kB slab_reclaimable:2132kB slab_unreclaimable:4304kB kernel_stack:1880kB pagetables:6296kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 0 0
> Normal: 31*4kB 29*8kB 20*16kB 23*32kB 21*64kB 19*128kB 19*256kB 20*512kB 20*1024kB 3*2048kB 41*4096kB = 214852kB
> 15491 total pagecache pages
> 131072 pages of RAM
> 54242 free pages
> 18897 reserved pages
> 1609 slab pages
> 84316 pages shared
> 0 pages swap cached
> Mem-info:
> Normal per-cpu:
> CPU 0: hi: 186, btch: 31 usd: 184
> active_anon:40345 inactive_anon:0 isolated_anon:8549
> active_file:2713 inactive_file:10418 isolated_file:1871
> unevictable:0 dirty:0 writeback:0 unstable:0
> free:53713 slab_reclaimable:533 slab_unreclaimable:1076
> mapped:9461 shmem:2349 pagetables:1574 bounce:0
> Normal free:214852kB min:2884kB low:3604kB high:4324kB active_anon:161380kB inactive_anon:0kB active_file:10852kB inactive_file:41672kB unevictable:0kB isolated(anon):34196kB isolated(file):7484kB present:520192kB mlocked:0kB dirty:0kB writeback:0kB mapped:37844kB shmem:9396kB slab_reclaimable:2132kB slab_unreclaimable:4304kB kernel_stack:1880kB pagetables:6296kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 0 0
> Normal: 26*4kB 27*8kB 19*16kB 22*32kB 20*64kB 19*128kB 19*256kB 20*512kB 20*1024kB 3*2048kB 41*4096kB = 214704kB
> 15491 total pagecache pages
> 131072 pages of RAM
> 54258 free pages
> 18897 reserved pages
> 1609 slab pages
> 84296 pages shared
> 0 pages swap cached
>
>
> [snip]
>
>
> Mem-info:
> Normal per-cpu:
> CPU 0: hi: 186, btch: 31 usd: 100
> active_anon:40429 inactive_anon:0 isolated_anon:8581
> active_file:2719 inactive_file:10423 isolated_file:1871
> unevictable:0 dirty:0 writeback:0 unstable:0
> free:53777 slab_reclaimable:534 slab_unreclaimable:1070
> mapped:9461 shmem:2349 pagetables:1574 bounce:0
> Normal free:215108kB min:2884kB low:3604kB high:4324kB active_anon:161716kB inactive_anon:0kB active_file:10876kB inactive_file:41692kB unevictable:0kB isolated(anon):34324kB isolated(file):7484kB present:520192kB mlocked:0kB dirty:0kB writeback:0kB mapped:37844kB shmem:9396kB slab_reclaimable:2136kB slab_unreclaimable:4280kB kernel_stack:1872kB pagetables:6296kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 0 0
> Normal: 31*4kB 29*8kB 20*16kB 21*32kB 22*64kB 19*128kB 20*256kB 20*512kB 20*1024kB 3*2048kB 41*4096kB = 215108kB
> 15491 total pagecache pages
> 131072 pages of RAM
> 54221 free pages
> 18897 reserved pages
> 1604 slab pages
> 84289 pages shared
> 0 pages swap cached
> Mem-info:
> Normal per-cpu:
> CPU 0: hi: 186, btch: 31 usd: 100
> active_anon:40429 inactive_anon:0 isolated_anon:8581
> active_file:2719 inactive_file:10423 isolated_file:1871
> unevictable:0 dirty:0 writeback:0 unstable:0
> free:53777 slab_reclaimable:534 slab_unreclaimable:1070
> mapped:9461 shmem:2349 pagetables:1574 bounce:0
> Normal free:215108kB min:2884kB low:3604kB high:4324kB active_anon:161716kB inactive_anon:0kB active_file:10876kB inactive_file:41692kB unevictable:0kB isolated(anon):34324kB isolated(file):7484kB present:520192kB mlocked:0kB dirty:0kB writeback:0kB mapped:37844kB shmem:9396kB slab_reclaimable:2136kB slab_unreclaimable:4280kB kernel_stack:1872kB pagetables:6296kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 0 0
> Normal: 31*4kB 29*8kB 20*16kB 21*32kB 22*64kB 19*128kB 20*256kB 20*512kB 20*1024kB 3*2048kB 41*4096kB = 215108kB
> 15491 total pagecache pages
> 131072 pages of RAM
> 54222 free pages
> 18897 reserved pages
> 1603 slab pages
> 84289 pages shared
> 0 pages swap cached
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next prev parent reply other threads:[~2010-08-20 5:34 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-17 11:08 compaction: trying to understand the code Iram Shahzad
2010-08-17 11:10 ` Mel Gorman
2010-08-18 8:19 ` Iram Shahzad
2010-08-18 15:41 ` Wu Fengguang
2010-08-19 7:09 ` Iram Shahzad
2010-08-19 7:45 ` Wu Fengguang
2010-08-19 7:46 ` Mel Gorman
2010-08-19 8:08 ` Wu Fengguang
2010-08-19 8:15 ` Mel Gorman
2010-08-19 8:29 ` Wu Fengguang
2010-08-20 5:45 ` Iram Shahzad
2010-08-20 5:50 ` Wu Fengguang
2010-08-20 6:13 ` Iram Shahzad
2010-08-19 16:00 ` Minchan Kim
2010-08-20 5:31 ` Iram Shahzad
2010-08-20 5:34 ` Wu Fengguang [this message]
2010-08-20 9:35 ` Mel Gorman
2010-08-20 10:22 ` Minchan Kim
2010-08-22 15:31 ` Minchan Kim
2010-08-22 23:23 ` Wu Fengguang
2010-08-23 1:58 ` Minchan Kim
2010-08-23 3:03 ` Iram Shahzad
2010-08-23 9:10 ` Minchan Kim
2010-08-26 8:51 ` Mel Gorman
2010-08-23 7:18 ` Mel Gorman
2010-08-23 17:14 ` Minchan Kim
2010-08-24 0:27 ` Wu Fengguang
2010-08-24 5:07 ` Iram Shahzad
2010-08-24 6:52 ` Minchan Kim
2010-08-26 8:05 ` Iram Shahzad
2010-08-23 7:16 ` Mel Gorman
2010-08-23 9:07 ` Minchan Kim
2010-08-20 10:23 ` Wu Fengguang
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