Re: [patch v3] swap: virtual swap readahead

Wu Fengguang
2009-06-19T03:17:30Z

[-- Attachment #1: Type: text/plain, Size: 6185 bytes --]

On Thu, Jun 18, 2009 at 09:09:34PM +0800, Johannes Weiner wrote:
> On Thu, Jun 18, 2009 at 05:29:47PM +0800, Wu Fengguang wrote:
> > Johannes,
> >
> > On Thu, Jun 18, 2009 at 06:41:49AM +0800, Johannes Weiner wrote:
> > > On Thu, Jun 11, 2009 at 02:31:22PM +0900, KAMEZAWA Hiroyuki wrote:
> > > > On Tue, 9 Jun 2009 21:01:28 +0200
> > > > Johannes Weiner <hannes@cmpxchg.org> wrote:
> > > > > [resend with lists cc'd, sorry]
> > > > >
> > > > > +static int swap_readahead_ptes(struct mm_struct *mm,
> >
> > I suspect the previous unfavorable results are due to comparing things
> > with/without the drm vmalloc patch. So I spent one day redo the whole
> > comparisons. The swap readahead patch shows neither big improvements
> > nor big degradations this time.
>
> Thanks again! Nice. So according to this, vswapra doesn't increase
> other IO latency (much) but boosts ongoing swap loads (quite some) (as
> qsbench showed). Is that a result or what! :)
>
> I will see how the tests described in the other mail work out.

And here are the /proc/vmstat contents after each test run :)

The pswpin number goes down radically in case (c) which seems
illogical.

pgpgin 8898235 pgpgin 4828771 pgpgin 1807731
pgpgout 1806868 pgpgout 1463644 pgpgout 1382244
==> pswpin 2222503 pswpin 1205137 pswpin 449877
pswpout 451716 pswpout 365910 pswpout 345560
pgalloc_dma 39883 pgalloc_dma 24343 pgalloc_dma 3547
pgalloc_dma32 11918819 pgalloc_dma32 6810775 pgalloc_dma32 6387602
pgalloc_normal 0 pgalloc_normal 0 pgalloc_normal 0
pgalloc_movable 0 pgalloc_movable 0 pgalloc_movable 0
pgfree 11961651 pgfree 6837658 pgfree 6396229
pgactivate 5771012 pgactivate 2999101 pgactivate 2341219
pgdeactivate 5909300 pgdeactivate 3140474 pgdeactivate 2481319
pgfault 4536082 pgfault 3468555 pgfault 3589046
==> pgmajfault 926383 pgmajfault 506265 pgmajfault 520010

Thanks,
Fengguang

> > Base kernel is 2.6.30-rc8-mm1 with drm vmalloc patch.
> >
> > a) base kernel
> > b) base kernel + VM_EXEC protection
> > c) base kernel + VM_EXEC protection + swap readahead
> >
> > (a) (b) (c)
> > 0.02 0.02 0.01 N xeyes
> > 0.78 0.92 0.77 N firefox
> > 2.03 2.20 1.97 N nautilus
> > 3.27 3.35 3.39 N nautilus --browser
> > 5.10 5.28 4.99 N gthumb
> > 6.74 7.06 6.64 N gedit
> > 8.70 8.82 8.47 N xpdf /usr/share/doc/shared-mime-info/shared-mime-info-spec.pdf
> > 11.05 10.95 10.94 N
> > 13.03 12.72 12.79 N xterm
> > 15.46 15.09 15.10 N mlterm
> > 18.05 17.31 17.51 N gnome-terminal
> > 20.59 19.90 19.98 N urxvt
> > 23.45 22.82 22.67 N
> > 25.74 25.16 24.96 N gnome-system-monitor
> > 28.87 27.53 27.89 N gnome-help
> > 32.37 31.17 31.89 N gnome-dictionary
> > 36.60 35.18 35.16 N
> > 39.76 38.04 37.64 N /usr/games/sol
> > 43.05 42.17 40.33 N /usr/games/gnometris
> > 47.70 47.08 43.48 N /usr/games/gnect
> > 51.64 50.46 47.24 N /usr/games/gtali
> > 56.26 54.58 50.83 N /usr/games/iagno
> > 60.36 58.01 55.15 N /usr/games/gnotravex
> > 65.79 62.92 59.28 N /usr/games/mahjongg
> > 71.59 67.36 65.95 N /usr/games/gnome-sudoku
> > 78.57 72.32 72.60 N /usr/games/glines
> > 84.25 80.03 77.42 N /usr/games/glchess
> > 90.65 88.11 83.66 N /usr/games/gnomine
> > 97.75 95.13 89.38 N /usr/games/gnotski
> > 102.99 101.59 95.05 N /usr/games/gnibbles
> > 110.68 112.05 109.40 N /usr/games/gnobots2
> > 117.23 121.58 120.05 N /usr/games/blackjack
> > 125.15 133.59 130.91 N /usr/games/same-gnome
> > 134.05 151.99 148.91 N
> > 142.57 162.67 165.00 N /usr/bin/gnome-window-properties
> > 156.29 174.54 183.84 N /usr/bin/gnome-default-applications-properties
> > 168.37 190.38 200.99 N /usr/bin/gnome-at-properties
> > 184.80 209.41 230.82 N /usr/bin/gnome-typing-monitor
> > 202.05 226.52 250.02 N /usr/bin/gnome-at-visual
> > 217.60 243.76 272.91 N /usr/bin/gnome-sound-properties
> > 239.78 266.47 308.74 N /usr/bin/gnome-at-mobility
> > 255.23 285.42 338.51 N /usr/bin/gnome-keybinding-properties
> > 276.85 314.84 374.64 N /usr/bin/gnome-about-me
> > 308.51 355.95 419.78 N /usr/bin/gnome-display-properties
> > 341.27 401.22 463.55 N /usr/bin/gnome-network-preferences
> > 393.42 451.27 517.24 N /usr/bin/gnome-mouse-properties
> > 438.48 510.54 574.64 N /usr/bin/gnome-appearance-properties
> > 616.09 671.44 760.49 N /usr/bin/gnome-control-center
> > 879.69 879.45 918.87 N /usr/bin/gnome-keyboard-properties
> > 1159.47 1076.29 1071.65 N
> > 1701.82 1240.47 1280.77 N : oocalc
> > 1921.14 1446.95 1451.82 N : oodraw
> > 2262.40 1572.95 1698.37 N : ooimpress
> > 2703.88 1714.53 1841.89 N : oomath
> > 3464.54 1864.99 1983.96 N : ooweb
> > 4040.91 2079.96 2185.53 N : oowriter
> > 4668.16 2330.24 2365.17 N
> >
> > Thanks,
> > Fengguang
> >

[-- Attachment #2: vmstat.0 --]
[-- Type: text/plain, Size: 1444 bytes --]

nr_free_pages 2774
nr_inactive_anon 49669
nr_active_anon 37887
nr_inactive_file 1943
nr_active_file 1432
nr_unevictable 4
nr_mlock 4
nr_anon_pages 33433
nr_mapped 3748
nr_file_pages 63113
nr_dirty 0
nr_writeback 14
nr_slab_reclaimable 3067
nr_slab_unreclaimable 11016
nr_page_table_pages 7733
nr_unstable 0
nr_bounce 0
nr_vmscan_write 452422
nr_writeback_temp 0
numa_hit 11905133
numa_miss 0
numa_foreign 0
numa_interleave 1719
numa_local 11905133
numa_other 0
pgpgin 8898235
pgpgout 1806868
pswpin 2222503
pswpout 451716
pgalloc_dma 39883
pgalloc_dma32 11918819
pgalloc_normal 0
pgalloc_movable 0
pgfree 11961651
pgactivate 5771012
pgdeactivate 5909300
pgfault 4536082
pgmajfault 926383
pgrefill_dma 3358
pgrefill_dma32 327639
pgrefill_normal 0
pgrefill_movable 0
pgsteal_dma 4163
pgsteal_dma32 9004008
pgsteal_normal 0
pgsteal_movable 0
pgscan_kswapd_dma 14283579
pgscan_kswapd_dma32 440003821
pgscan_kswapd_normal 0
pgscan_kswapd_movable 0
pgscan_direct_dma 2518976
pgscan_direct_dma32 85187744
pgscan_direct_normal 0
pgscan_direct_movable 0
pginodesteal 4578
slabs_scanned 567936
kswapd_steal 8653718
kswapd_inodesteal 11378
pageoutrun 154601
allocstall 7487
pgrotated 438820
htlb_buddy_alloc_success 0
htlb_buddy_alloc_fail 0
unevictable_pgs_culled 0
unevictable_pgs_scanned 0
unevictable_pgs_rescued 0
unevictable_pgs_mlocked 4
unevictable_pgs_munlocked 0
unevictable_pgs_cleared 0
unevictable_pgs_stranded 0
unevictable_pgs_mlockfreed 0

[-- Attachment #3: vmstat.1 --]
[-- Type: text/plain, Size: 1437 bytes --]

nr_free_pages 2441
nr_inactive_anon 48016
nr_active_anon 38622
nr_inactive_file 3402
nr_active_file 1641
nr_unevictable 4
nr_mlock 4
nr_anon_pages 34731
nr_mapped 3599
nr_file_pages 62566
nr_dirty 0
nr_writeback 2
nr_slab_reclaimable 3091
nr_slab_unreclaimable 10664
nr_page_table_pages 7769
nr_unstable 0
nr_bounce 0
nr_vmscan_write 366662
nr_writeback_temp 0
numa_hit 6789271
numa_miss 0
numa_foreign 0
numa_interleave 1719
numa_local 6789271
numa_other 0
pgpgin 4828771
pgpgout 1463644
pswpin 1205137
pswpout 365910
pgalloc_dma 24343
pgalloc_dma32 6810775
pgalloc_normal 0
pgalloc_movable 0
pgfree 6837658
pgactivate 2999101
pgdeactivate 3140474
pgfault 3468555
pgmajfault 506265
pgrefill_dma 2336
pgrefill_dma32 729107
pgrefill_normal 0
pgrefill_movable 0
pgsteal_dma 1913
pgsteal_dma32 4357494
pgsteal_normal 0
pgsteal_movable 0
pgscan_kswapd_dma 6712845
pgscan_kswapd_dma32 286604714
pgscan_kswapd_normal 0
pgscan_kswapd_movable 0
pgscan_direct_dma 1341301
pgscan_direct_dma32 59422832
pgscan_direct_normal 0
pgscan_direct_movable 0
pginodesteal 4612
slabs_scanned 575616
kswapd_steal 4132786
kswapd_inodesteal 13238
pageoutrun 68758
allocstall 4576
pgrotated 359071
htlb_buddy_alloc_success 0
htlb_buddy_alloc_fail 0
unevictable_pgs_culled 0
unevictable_pgs_scanned 0
unevictable_pgs_rescued 0
unevictable_pgs_mlocked 4
unevictable_pgs_munlocked 0
unevictable_pgs_cleared 0
unevictable_pgs_stranded 0
unevictable_pgs_mlockfreed 0

[-- Attachment #4: vmstat.2 --]
[-- Type: text/plain, Size: 1429 bytes --]

nr_free_pages 5027
nr_inactive_anon 45647
nr_active_anon 39133
nr_inactive_file 2213
nr_active_file 2204
nr_unevictable 4
nr_mlock 4
nr_anon_pages 34044
nr_mapped 4110
nr_file_pages 60736
nr_dirty 0
nr_writeback 2
nr_slab_reclaimable 3024
nr_slab_unreclaimable 10694
nr_page_table_pages 7737
nr_unstable 0
nr_bounce 0
nr_vmscan_write 346130
nr_writeback_temp 0
numa_hit 6348796
numa_miss 0
numa_foreign 0
numa_interleave 1719
numa_local 6348796
numa_other 0
pgpgin 1807731
pgpgout 1382244
pswpin 449877
pswpout 345560
pgalloc_dma 3547
pgalloc_dma32 6387602
pgalloc_normal 0
pgalloc_movable 0
pgfree 6396229
pgactivate 2341219
pgdeactivate 2481319
pgfault 3589046
pgmajfault 520010
pgrefill_dma 1760
pgrefill_dma32 704673
pgrefill_normal 0
pgrefill_movable 0
pgsteal_dma 0
pgsteal_dma32 3801681
pgsteal_normal 0
pgsteal_movable 0
pgscan_kswapd_dma 9155325
pgscan_kswapd_dma32 225882967
pgscan_kswapd_normal 0
pgscan_kswapd_movable 0
pgscan_direct_dma 89949
pgscan_direct_dma32 2499274
pgscan_direct_normal 0
pgscan_direct_movable 0
pginodesteal 3410
slabs_scanned 544000
kswapd_steal 3618518
kswapd_inodesteal 11438
pageoutrun 59774
allocstall 4014
pgrotated 326236
htlb_buddy_alloc_success 0
htlb_buddy_alloc_fail 0
unevictable_pgs_culled 0
unevictable_pgs_scanned 0
unevictable_pgs_rescued 0
unevictable_pgs_mlocked 4
unevictable_pgs_munlocked 0
unevictable_pgs_cleared 0
unevictable_pgs_stranded 0
unevictable_pgs_mlockfreed 0