Re: compaction: trying to understand the code

["Iram Shahzad" <iram.shahzad@jp.fujitsu.com>]

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> One question is, why kswapd won't proceed after isolating all the pages?
> If it has done with the isolated pages, we'll see growing inactive_anon
> numbers.
> 
> /proc/vmstat should give more clues on any possible page reclaim
> activities. Iram, would you help post it?

I am not sure which point of time are you interested in, so I am
attaching /proc/vmstat log of 3 points.

too_many_isolated_vmstat_before_frag.txt
   This one is taken before I ran my test app which attempts
   to make fragmentation
too_many_isolated_vmstat_before_compaction.txt
   This one is taken after running the test app and before
   running compaction.
too_many_isolated_vmstat_during_compaction.txt
   This one is taken a few minutes after running compaction.
   To take this I ran compaction in background.

Thanks
Iram

[-- Attachment #2: too_many_isolated_vmstat_before_frag.txt --]
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nr_free_pages 79896
nr_inactive_anon 0
nr_active_anon 14688
nr_inactive_file 10444
nr_active_file 2718
nr_unevictable 0
nr_mlock 0
nr_anon_pages 12341
nr_mapped 9430
nr_file_pages 15511
nr_dirty 0
nr_writeback 0
nr_slab_reclaimable 528
nr_slab_unreclaimable 1073
nr_page_table_pages 1479
nr_kernel_stack 235
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 2349
pgpgin 4
pgpgout 0
pswpin 0
pswpout 0
pgalloc_normal 54208
pgalloc_high 0
pgalloc_movable 0
pgfree 134220
pgactivate 2718
pgdeactivate 0
pgfault 88952
pgmajfault 555
pgrefill_normal 0
pgrefill_high 0
pgrefill_movable 0
pgsteal_normal 0
pgsteal_high 0
pgsteal_movable 0
pgscan_kswapd_normal 0
pgscan_kswapd_high 0
pgscan_kswapd_movable 0
pgscan_direct_normal 0
pgscan_direct_high 0
pgscan_direct_movable 0
pginodesteal 0
slabs_scanned 0
kswapd_steal 0
kswapd_inodesteal 0
pageoutrun 0
allocstall 0
pgrotated 0
compact_blocks_moved 0
compact_pages_moved 0
compact_pagemigrate_failed 0
compact_stall 0
compact_fail 0
compact_success 0
unevictable_pgs_culled 0
unevictable_pgs_scanned 0
unevictable_pgs_rescued 0
unevictable_pgs_mlocked 0
unevictable_pgs_munlocked 0
unevictable_pgs_cleared 0
unevictable_pgs_stranded 0
unevictable_pgs_mlockfreed 0

[-- Attachment #3: too_many_isolated_vmstat_before_compaction.txt --]
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nr_free_pages 54098
nr_inactive_anon 0
nr_active_anon 40354
nr_inactive_file 10433
nr_active_file 2729
nr_unevictable 0
nr_mlock 0
nr_anon_pages 38007
nr_mapped 9469
nr_file_pages 15511
nr_dirty 0
nr_writeback 0
nr_slab_reclaimable 528
nr_slab_unreclaimable 1070
nr_page_table_pages 1582
nr_kernel_stack 236
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 2349
pgpgin 4
pgpgout 0
pswpin 0
pswpout 0
pgalloc_normal 105927
pgalloc_high 0
pgalloc_movable 0
pgfree 160167
pgactivate 2729
pgdeactivate 0
pgfault 141220
pgmajfault 555
pgrefill_normal 0
pgrefill_high 0
pgrefill_movable 0
pgsteal_normal 0
pgsteal_high 0
pgsteal_movable 0
pgscan_kswapd_normal 0
pgscan_kswapd_high 0
pgscan_kswapd_movable 0
pgscan_direct_normal 0
pgscan_direct_high 0
pgscan_direct_movable 0
pginodesteal 0
slabs_scanned 0
kswapd_steal 0
kswapd_inodesteal 0
pageoutrun 0
allocstall 0
pgrotated 0
compact_blocks_moved 0
compact_pages_moved 0
compact_pagemigrate_failed 0
compact_stall 0
compact_fail 0
compact_success 0
unevictable_pgs_culled 0
unevictable_pgs_scanned 0
unevictable_pgs_rescued 0
unevictable_pgs_mlocked 0
unevictable_pgs_munlocked 0
unevictable_pgs_cleared 0
unevictable_pgs_stranded 0
unevictable_pgs_mlockfreed 0

[-- Attachment #4: too_many_isolated_vmstat_during_compaction.txt --]
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nr_free_pages 53673
nr_inactive_anon 0
nr_active_anon 40498
nr_inactive_file 10427
nr_active_file 2735
nr_unevictable 0
nr_mlock 0
nr_anon_pages 38151
nr_mapped 9469
nr_file_pages 15511
nr_dirty 0
nr_writeback 0
nr_slab_reclaimable 536
nr_slab_unreclaimable 1070
nr_page_table_pages 1588
nr_kernel_stack 237
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_writeback_temp 0
nr_isolated_anon 8592
nr_isolated_file 1862
nr_shmem 2349
pgpgin 4
pgpgout 0
pswpin 0
pswpout 0
pgalloc_normal 117872
pgalloc_high 0
pgalloc_movable 0
pgfree 182402
pgactivate 2735
pgdeactivate 0
pgfault 182499
pgmajfault 555
pgrefill_normal 0
pgrefill_high 0
pgrefill_movable 0
pgsteal_normal 0
pgsteal_high 0
pgsteal_movable 0
pgscan_kswapd_normal 0
pgscan_kswapd_high 0
pgscan_kswapd_movable 0
pgscan_direct_normal 0
pgscan_direct_high 0
pgscan_direct_movable 0
pginodesteal 0
slabs_scanned 0
kswapd_steal 0
kswapd_inodesteal 0
pageoutrun 0
allocstall 0
pgrotated 0
compact_blocks_moved 327
compact_pages_moved 10454
compact_pagemigrate_failed 0
compact_stall 0
compact_fail 0
compact_success 0
unevictable_pgs_culled 0
unevictable_pgs_scanned 0
unevictable_pgs_rescued 0
unevictable_pgs_mlocked 0
unevictable_pgs_munlocked 0
unevictable_pgs_cleared 0
unevictable_pgs_stranded 0
unevictable_pgs_mlockfreed 0