Re: [PATCH 05/16] mm: balance zone aging in kswapd reclaim path

From: Wu Fengguang
Date: Wed Dec 07 2005 - 05:31:27 EST

Here is the new testing reports. The intermittent and concurrent copy of two
files is expected to generate large range of unreclaimable pages.

The balance seems to improve a lot since last version. And the direct reclaim
times is reduced to minimal.

IN QEMU
=======
root ~# grep (age |rounds) /proc/zoneinfo
rounds 142
age 3621
rounds 142
age 3499
rounds 142
age 3502

root ~# ./show-aging-rate.sh
Linux (none) 2.6.15-rc5-mm1 #8 SMP Wed Dec 7 16:06:47 CST 2005 i686 GNU/Linux
total used free shared buffers cached
Mem: 1138 1119 18 0 0 1105
-/+ buffers/cache: 14 1124
Swap: 0 0 0

---------------------------------------------------------------
active/inactive size ratios:
DMA0: 469 / 1000 = 621 / 1323
Normal0: 374 / 1000 = 58588 / 156523
HighMem0: 397 / 1000 = 18880 / 47498

active/inactive scan rates:
DMA: 273 / 1000 = 58528 / ( 210464 + 3296)
Normal: 342 / 1000 = 7851552 / ( 22838944 + 94080)
HighMem: 393 / 1000 = 2680480 / ( 6774304 + 31040)

---------------------------------------------------------------
inactive size ratios:
DMA0 / Normal0: 85 / 10000 = 1334 / 156630
Normal0 / HighMem0: 32946 / 10000 = 156630 / 47540

inactive scan rates:
DMA / Normal: 93 / 10000 = ( 210464 + 3296) / ( 22838944 + 94080)
Normal / HighMem: 33698 / 10000 = ( 22838944 + 94080) / ( 6774304 + 31040)

root ~# grep -E '(low|high|free|protection:) ' /proc/zoneinfo
pages free 1161
low 21
high 25
protection: (0, 0, 880, 1140)
pages free 3505
low 1173
high 1408
protection: (0, 0, 0, 2080)
pages free 189
low 134
high 203
protection: (0, 0, 0, 0)

root ~# vmstat 5 10
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 0 0 18556 344 1131720 0 0 16 5 1042 37 4 66 30 0
2 0 0 18616 352 1132324 0 0 0 16 1035 48 6 94 0 0
2 0 0 19060 348 1131512 0 0 0 3 974 52 6 94 0 0
2 0 0 18256 268 1132272 0 0 0 8 1018 50 6 94 0 0
2 0 0 19096 248 1132020 0 0 0 3 1009 49 6 94 0 0
2 0 0 19520 248 1130524 0 0 0 8 989 50 6 94 0 0
2 0 0 18916 248 1131680 0 0 0 3 1008 49 6 94 0 0
1 0 0 18436 208 1132740 0 0 0 7 1009 64 4 96 0 0
2 0 0 18976 200 1132272 0 0 0 14 1029 64 5 95 0 0
2 0 0 19156 200 1131932 0 0 0 8 992 48 6 94 0 0

root ~# cat /proc/vmstat
nr_dirty 9
nr_writeback 0
nr_unstable 0
nr_page_table_pages 22
nr_mapped 971
nr_slab 1405
pgpgin 68177
pgpgout 21820
pswpin 0
pswpout 0
pgalloc_high 4338439
pgalloc_normal 15416448
pgalloc_dma32 0
pgalloc_dma 157690
pgfree 19917495
pgactivate 10660320
pgdeactivate 10582874
pgkeephot 53405
pgkeepcold 17
pgfault 145079
pgmajfault 116
pgrefill_high 2707872
pgrefill_normal 7936896
pgrefill_dma32 0
pgrefill_dma 59392
pgsteal_high 4264660
pgsteal_normal 15171368
pgsteal_dma32 0
pgsteal_dma 155635
pgscan_kswapd_high 6843616
pgscan_kswapd_normal 23067616
pgscan_kswapd_dma32 0
pgscan_kswapd_dma 212352
pgscan_direct_high 31040
pgscan_direct_normal 94080
pgscan_direct_dma32 0
pgscan_direct_dma 3296
pginodesteal 0
slabs_scanned 128
kswapd_steal 19582040
kswapd_inodesteal 0
pageoutrun 547184
allocstall 274
pgrotated 8
nr_bounce 0


ON A REAL BOX
=============
root@Server ~# grep (age |rounds) /proc/zoneinfo
rounds 164
age 410
rounds 150
age 396
rounds 150
age 396

root@Server ~# ./show-aging-rate.sh
Linux Server 2.6.15-rc5-mm1 #9 SMP Wed Dec 7 16:47:56 CST 2005 i686 GNU/Linux
total used free shared buffers cached
Mem: 2020 1970 50 0 5 1916
-/+ buffers/cache: 48 1972
Swap: 0 0 0

---------------------------------------------------------------
active/inactive size ratios:
DMA0: 132 / 1000 = 123 / 930
Normal0: 161 / 1000 = 28022 / 173838
HighMem0: 177 / 1000 = 43935 / 247952

active/inactive scan rates:
DMA: 170 / 1000 = 23889 / ( 118528 + 21216)
Normal: 210 / 1000 = 5296960 / ( 24645696 + 484160)
HighMem: 239 / 1000 = 8501024 / ( 34741600 + 752000)

---------------------------------------------------------------
inactive size ratios:
DMA0 / Normal0: 53 / 10000 = 930 / 173838
Normal0 / HighMem0: 7010 / 10000 = 173838 / 247952

inactive scan rates:
DMA / Normal: 55 / 10000 = ( 118528 + 21216) / ( 24645696 + 484160)
Normal / HighMem: 7080 / 10000 = ( 24645696 + 484160) / ( 34741600 + 752000)

pageoutrun / allocstall = 73374 / 100 = 1072730 / 1461
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