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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . 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