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SubjectRe: [patch 3/5] mm: try to distribute dirty pages fairly across zones
Hi Johannes,

I tested this patchset over the IO-less dirty throttling one.
The below numbers show that

//improvements
1) write bandwidth increased by 1% in general
2) greatly reduced nr_vmscan_immediate_reclaim

//regression
3) much increased cpu %user and %system for btrfs

Thanks,
Fengguang
---

kernel before this patchset: 3.1.0-rc9-ioless-full-nfs-wq5-next-20111014+
kernel after this patchset: 3.1.0-rc9-ioless-full-per-zone-dirty-next-20111014+

3.1.0-rc9-ioless-full-nfs-wq5-next-20111014+ 3.1.0-rc9-ioless-full-per-zone-dirty-next-20111014+
------------------------ ------------------------
2056.51 +1.0% 2076.29 TOTAL write_bw
32260625.00 -86.0% 4532517.00 TOTAL nr_vmscan_immediate_reclaim
90.44 +25.7% 113.67 TOTAL cpu_user
113.05 +9.9% 124.25 TOTAL cpu_system

3.1.0-rc9-ioless-full-nfs-wq5-next-20111014+ 3.1.0-rc9-ioless-full-per-zone-dirty-next-20111014+
------------------------ ------------------------
52.43 +1.3% 53.12 thresh=1000M/btrfs-100dd-4k-8p-4096M-1000M:10-X
52.72 +0.8% 53.16 thresh=1000M/btrfs-10dd-4k-8p-4096M-1000M:10-X
52.24 +2.7% 53.67 thresh=1000M/btrfs-1dd-4k-8p-4096M-1000M:10-X
35.52 +1.2% 35.94 thresh=1000M/ext3-100dd-4k-8p-4096M-1000M:10-X
39.37 +1.6% 39.98 thresh=1000M/ext3-10dd-4k-8p-4096M-1000M:10-X
47.52 +0.5% 47.75 thresh=1000M/ext3-1dd-4k-8p-4096M-1000M:10-X
47.13 +1.1% 47.64 thresh=1000M/ext4-100dd-4k-8p-4096M-1000M:10-X
52.28 +3.0% 53.86 thresh=1000M/ext4-10dd-4k-8p-4096M-1000M:10-X
54.34 +1.0% 54.87 thresh=1000M/ext4-1dd-4k-8p-4096M-1000M:10-X
47.63 +0.3% 47.78 thresh=1000M/xfs-100dd-4k-8p-4096M-1000M:10-X
51.25 +2.1% 52.34 thresh=1000M/xfs-10dd-4k-8p-4096M-1000M:10-X
52.66 +2.5% 54.00 thresh=1000M/xfs-1dd-4k-8p-4096M-1000M:10-X
54.63 -0.0% 54.63 thresh=100M/btrfs-10dd-4k-8p-4096M-100M:10-X
53.75 +1.0% 54.29 thresh=100M/btrfs-1dd-4k-8p-4096M-100M:10-X
54.14 +0.4% 54.35 thresh=100M/btrfs-2dd-4k-8p-4096M-100M:10-X
36.87 -0.0% 36.86 thresh=100M/ext3-10dd-4k-8p-4096M-100M:10-X
45.20 -0.3% 45.07 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
40.75 -0.6% 40.51 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
44.14 +0.3% 44.29 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
52.91 +0.1% 52.99 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
50.30 +0.8% 50.72 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
44.55 +2.8% 45.80 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
52.75 +4.3% 55.03 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
50.99 +1.7% 51.87 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
37.35 +2.0% 38.11 thresh=10M/btrfs-10dd-4k-8p-4096M-10M:10-X
53.32 +2.3% 54.55 thresh=10M/btrfs-1dd-4k-8p-4096M-10M:10-X
50.72 +3.9% 52.70 thresh=10M/btrfs-2dd-4k-8p-4096M-10M:10-X
32.05 +0.7% 32.27 thresh=10M/ext3-10dd-4k-8p-4096M-10M:10-X
43.91 -1.2% 43.39 thresh=10M/ext3-1dd-4k-8p-4096M-10M:10-X
42.37 +0.3% 42.50 thresh=10M/ext3-2dd-4k-8p-4096M-10M:10-X
35.04 -1.9% 34.36 thresh=10M/ext4-10dd-4k-8p-4096M-10M:10-X
52.93 -0.4% 52.73 thresh=10M/ext4-1dd-4k-8p-4096M-10M:10-X
49.24 -0.0% 49.22 thresh=10M/ext4-2dd-4k-8p-4096M-10M:10-X
30.96 -0.8% 30.73 thresh=10M/xfs-10dd-4k-8p-4096M-10M:10-X
54.30 -0.8% 53.89 thresh=10M/xfs-1dd-4k-8p-4096M-10M:10-X
45.63 +1.2% 46.17 thresh=10M/xfs-2dd-4k-8p-4096M-10M:10-X
1.92 -1.5% 1.89 thresh=1M/btrfs-10dd-4k-8p-4096M-1M:10-X
2.28 +5.9% 2.42 thresh=1M/btrfs-1dd-4k-8p-4096M-1M:10-X
2.07 -1.4% 2.04 thresh=1M/btrfs-2dd-4k-8p-4096M-1M:10-X
25.31 +10.2% 27.88 thresh=1M/ext3-10dd-4k-8p-4096M-1M:10-X
42.95 -0.9% 42.56 thresh=1M/ext3-1dd-4k-8p-4096M-1M:10-X
38.62 -0.9% 38.26 thresh=1M/ext3-2dd-4k-8p-4096M-1M:10-X
30.81 -1.0% 30.51 thresh=1M/ext4-10dd-4k-8p-4096M-1M:10-X
49.72 +0.2% 49.80 thresh=1M/ext4-1dd-4k-8p-4096M-1M:10-X
44.75 -0.3% 44.61 thresh=1M/ext4-2dd-4k-8p-4096M-1M:10-X
27.87 +1.3% 28.23 thresh=1M/xfs-10dd-4k-8p-4096M-1M:10-X
51.05 +1.0% 51.54 thresh=1M/xfs-1dd-4k-8p-4096M-1M:10-X
45.25 +0.3% 45.39 thresh=1M/xfs-2dd-4k-8p-4096M-1M:10-X
2056.51 +1.0% 2076.29 TOTAL write_bw

3.1.0-rc9-ioless-full-nfs-wq5-next-20111014+ 3.1.0-rc9-ioless-full-per-zone-dirty-next-20111014+
------------------------ ------------------------
560289.00 -98.5% 8145.00 thresh=1000M/btrfs-100dd-4k-8p-4096M-1000M:10-X
576882.00 -98.4% 9511.00 thresh=1000M/btrfs-10dd-4k-8p-4096M-1000M:10-X
651258.00 -98.8% 7963.00 thresh=1000M/btrfs-1dd-4k-8p-4096M-1000M:10-X
1963294.00 -85.4% 286815.00 thresh=1000M/ext3-100dd-4k-8p-4096M-1000M:10-X
2108028.00 -10.6% 1885114.00 thresh=1000M/ext3-10dd-4k-8p-4096M-1000M:10-X
2499456.00 -99.9% 2061.00 thresh=1000M/ext3-1dd-4k-8p-4096M-1000M:10-X
2534868.00 -78.5% 545815.00 thresh=1000M/ext4-100dd-4k-8p-4096M-1000M:10-X
2921668.00 -76.8% 677177.00 thresh=1000M/ext4-10dd-4k-8p-4096M-1000M:10-X
2841049.00 -100.0% 779.00 thresh=1000M/ext4-1dd-4k-8p-4096M-1000M:10-X
2481823.00 -86.3% 339342.00 thresh=1000M/xfs-100dd-4k-8p-4096M-1000M:10-X
2508629.00 -87.4% 316614.00 thresh=1000M/xfs-10dd-4k-8p-4096M-1000M:10-X
2656628.00 -100.0% 678.00 thresh=1000M/xfs-1dd-4k-8p-4096M-1000M:10-X
466024.00 -98.9% 5263.00 thresh=100M/btrfs-10dd-4k-8p-4096M-100M:10-X
460626.00 -99.6% 1853.00 thresh=100M/btrfs-1dd-4k-8p-4096M-100M:10-X
454364.00 -99.3% 2959.00 thresh=100M/btrfs-2dd-4k-8p-4096M-100M:10-X
682975.00 -89.3% 73185.00 thresh=100M/ext3-10dd-4k-8p-4096M-100M:10-X
787717.00 -99.7% 2648.00 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
611101.00 -99.2% 4629.00 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
555841.00 -87.9% 67433.00 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
475452.00 -99.9% 311.00 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
501009.00 -97.9% 10608.00 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
362202.00 -82.4% 63873.00 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
716571.00 0.00 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
621495.00 -93.9% 38030.00 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
4463.00 -81.2% 839.00 thresh=10M/btrfs-10dd-4k-8p-4096M-10M:10-X
18824.00 -97.4% 490.00 thresh=10M/btrfs-1dd-4k-8p-4096M-10M:10-X
12486.00 -94.1% 736.00 thresh=10M/btrfs-2dd-4k-8p-4096M-10M:10-X
43396.00 -70.2% 12945.00 thresh=10M/ext3-10dd-4k-8p-4096M-10M:10-X
109247.00 -100.0% 42.00 thresh=10M/ext3-1dd-4k-8p-4096M-10M:10-X
92196.00 -100.0% 15.00 thresh=10M/ext3-2dd-4k-8p-4096M-10M:10-X
44717.00 -52.9% 21078.00 thresh=10M/ext4-10dd-4k-8p-4096M-10M:10-X
87977.00 0.00 thresh=10M/ext4-1dd-4k-8p-4096M-10M:10-X
130864.00 -98.9% 1381.00 thresh=10M/ext4-2dd-4k-8p-4096M-10M:10-X
35133.00 -99.9% 52.00 thresh=10M/xfs-10dd-4k-8p-4096M-10M:10-X
117181.00 -100.0% 10.00 thresh=10M/xfs-1dd-4k-8p-4096M-10M:10-X
133795.00 -79.3% 27705.00 thresh=10M/xfs-2dd-4k-8p-4096M-10M:10-X
0.00 0.00 thresh=1M/btrfs-10dd-4k-8p-4096M-1M:10-X
5.00 0.00 thresh=1M/btrfs-1dd-4k-8p-4096M-1M:10-X
0.00 0.00 thresh=1M/btrfs-2dd-4k-8p-4096M-1M:10-X
34914.00 -62.8% 12983.00 thresh=1M/ext3-10dd-4k-8p-4096M-1M:10-X
73497.00 0.00 thresh=1M/ext3-1dd-4k-8p-4096M-1M:10-X
52923.00 -68.0% 16922.00 thresh=1M/ext3-2dd-4k-8p-4096M-1M:10-X
40172.00 -65.8% 13750.00 thresh=1M/ext4-10dd-4k-8p-4096M-1M:10-X
60073.00 -79.0% 12601.00 thresh=1M/ext4-1dd-4k-8p-4096M-1M:10-X
58565.00 -69.8% 17690.00 thresh=1M/ext4-2dd-4k-8p-4096M-1M:10-X
21840.00 -50.8% 10744.00 thresh=1M/xfs-10dd-4k-8p-4096M-1M:10-X
46227.00 -65.2% 16103.00 thresh=1M/xfs-1dd-4k-8p-4096M-1M:10-X
42881.00 -63.6% 15625.00 thresh=1M/xfs-2dd-4k-8p-4096M-1M:10-X
32260625.00 -86.0% 4532517.00 TOTAL nr_vmscan_immediate_reclaim


3.1.0-rc9-ioless-full-nfs-wq5-next-20111014+ 3.1.0-rc9-ioless-full-per-zone-dirty-next-20111014+
------------------------ ------------------------
4.46 +48.6% 6.62 thresh=1000M/btrfs-100dd-4k-8p-4096M-1000M:10-X
0.92 +261.7% 3.34 thresh=1000M/btrfs-10dd-4k-8p-4096M-1000M:10-X
1.12 +222.2% 3.61 thresh=1000M/btrfs-1dd-4k-8p-4096M-1000M:10-X
2.59 -14.3% 2.22 thresh=1000M/ext3-100dd-4k-8p-4096M-1000M:10-X
0.68 -0.6% 0.67 thresh=1000M/ext3-10dd-4k-8p-4096M-1000M:10-X
0.67 -3.2% 0.64 thresh=1000M/ext3-1dd-4k-8p-4096M-1000M:10-X
2.84 +1.9% 2.89 thresh=1000M/ext4-100dd-4k-8p-4096M-1000M:10-X
0.70 +1.7% 0.71 thresh=1000M/ext4-10dd-4k-8p-4096M-1000M:10-X
0.70 -6.3% 0.66 thresh=1000M/ext4-1dd-4k-8p-4096M-1000M:10-X
2.86 +1.5% 2.91 thresh=1000M/xfs-100dd-4k-8p-4096M-1000M:10-X
0.75 -0.5% 0.75 thresh=1000M/xfs-10dd-4k-8p-4096M-1000M:10-X
0.96 -4.0% 0.92 thresh=1000M/xfs-1dd-4k-8p-4096M-1000M:10-X
1.15 +229.7% 3.79 thresh=100M/btrfs-10dd-4k-8p-4096M-100M:10-X
0.95 +269.8% 3.50 thresh=100M/btrfs-1dd-4k-8p-4096M-100M:10-X
0.84 +309.1% 3.45 thresh=100M/btrfs-2dd-4k-8p-4096M-100M:10-X
0.76 -0.8% 0.76 thresh=100M/ext3-10dd-4k-8p-4096M-100M:10-X
0.73 -5.5% 0.69 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
0.66 -5.3% 0.62 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
0.89 +2.0% 0.91 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
0.75 -7.0% 0.70 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
0.74 -4.5% 0.71 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
0.92 +1.1% 0.93 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
0.99 -4.4% 0.95 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
0.91 -2.2% 0.89 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
2.51 +107.7% 5.21 thresh=10M/btrfs-10dd-4k-8p-4096M-10M:10-X
2.46 +103.1% 4.99 thresh=10M/btrfs-1dd-4k-8p-4096M-10M:10-X
2.33 +113.0% 4.97 thresh=10M/btrfs-2dd-4k-8p-4096M-10M:10-X
1.52 +0.2% 1.53 thresh=10M/ext3-10dd-4k-8p-4096M-10M:10-X
2.07 -1.4% 2.04 thresh=10M/ext3-1dd-4k-8p-4096M-10M:10-X
1.92 -0.1% 1.92 thresh=10M/ext3-2dd-4k-8p-4096M-10M:10-X
1.66 -3.2% 1.61 thresh=10M/ext4-10dd-4k-8p-4096M-10M:10-X
2.48 -0.8% 2.46 thresh=10M/ext4-1dd-4k-8p-4096M-10M:10-X
2.22 -1.2% 2.19 thresh=10M/ext4-2dd-4k-8p-4096M-10M:10-X
1.51 -1.4% 1.49 thresh=10M/xfs-10dd-4k-8p-4096M-10M:10-X
2.04 -1.8% 2.00 thresh=10M/xfs-1dd-4k-8p-4096M-10M:10-X
1.80 +1.5% 1.82 thresh=10M/xfs-2dd-4k-8p-4096M-10M:10-X
2.72 +13.0% 3.08 thresh=1M/btrfs-10dd-4k-8p-4096M-1M:10-X
1.05 +15.4% 1.21 thresh=1M/btrfs-1dd-4k-8p-4096M-1M:10-X
1.07 +16.5% 1.25 thresh=1M/btrfs-2dd-4k-8p-4096M-1M:10-X
4.58 +7.6% 4.93 thresh=1M/ext3-10dd-4k-8p-4096M-1M:10-X
2.49 -0.3% 2.49 thresh=1M/ext3-1dd-4k-8p-4096M-1M:10-X
2.81 +0.8% 2.83 thresh=1M/ext3-2dd-4k-8p-4096M-1M:10-X
5.25 +1.7% 5.34 thresh=1M/ext4-10dd-4k-8p-4096M-1M:10-X
2.52 +1.4% 2.56 thresh=1M/ext4-1dd-4k-8p-4096M-1M:10-X
2.83 -0.4% 2.82 thresh=1M/ext4-2dd-4k-8p-4096M-1M:10-X
5.11 +1.5% 5.19 thresh=1M/xfs-10dd-4k-8p-4096M-1M:10-X
2.81 -0.1% 2.81 thresh=1M/xfs-1dd-4k-8p-4096M-1M:10-X
3.11 -0.6% 3.09 thresh=1M/xfs-2dd-4k-8p-4096M-1M:10-X
90.44 +25.7% 113.67 TOTAL cpu_user

3.1.0-rc9-ioless-full-nfs-wq5-next-20111014+ 3.1.0-rc9-ioless-full-per-zone-dirty-next-20111014+
------------------------ ------------------------
6.49 +20.1% 7.79 thresh=1000M/btrfs-100dd-4k-8p-4096M-1000M:10-X
5.24 +26.9% 6.65 thresh=1000M/btrfs-10dd-4k-8p-4096M-1000M:10-X
6.16 +22.0% 7.51 thresh=1000M/btrfs-1dd-4k-8p-4096M-1000M:10-X
1.15 -12.3% 1.01 thresh=1000M/ext3-100dd-4k-8p-4096M-1000M:10-X
0.71 +1.5% 0.72 thresh=1000M/ext3-10dd-4k-8p-4096M-1000M:10-X
2.15 -3.2% 2.08 thresh=1000M/ext3-1dd-4k-8p-4096M-1000M:10-X
1.29 +1.1% 1.31 thresh=1000M/ext4-100dd-4k-8p-4096M-1000M:10-X
0.84 +0.1% 0.84 thresh=1000M/ext4-10dd-4k-8p-4096M-1000M:10-X
2.10 -1.9% 2.06 thresh=1000M/ext4-1dd-4k-8p-4096M-1000M:10-X
1.24 -0.5% 1.23 thresh=1000M/xfs-100dd-4k-8p-4096M-1000M:10-X
0.65 +1.6% 0.66 thresh=1000M/xfs-10dd-4k-8p-4096M-1000M:10-X
1.77 +3.5% 1.83 thresh=1000M/xfs-1dd-4k-8p-4096M-1000M:10-X
5.38 +22.5% 6.59 thresh=100M/btrfs-10dd-4k-8p-4096M-100M:10-X
6.05 +19.7% 7.25 thresh=100M/btrfs-1dd-4k-8p-4096M-100M:10-X
5.99 +18.9% 7.13 thresh=100M/btrfs-2dd-4k-8p-4096M-100M:10-X
0.71 +2.8% 0.73 thresh=100M/ext3-10dd-4k-8p-4096M-100M:10-X
2.28 -1.3% 2.25 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
1.88 -2.0% 1.85 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
0.68 -1.1% 0.67 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
1.65 +0.4% 1.66 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
1.51 -2.9% 1.47 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
0.63 +2.9% 0.65 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
1.87 +1.7% 1.90 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
1.70 -1.4% 1.68 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
5.31 +25.7% 6.67 thresh=10M/btrfs-10dd-4k-8p-4096M-10M:10-X
5.50 +21.3% 6.67 thresh=10M/btrfs-1dd-4k-8p-4096M-10M:10-X
5.74 +20.8% 6.94 thresh=10M/btrfs-2dd-4k-8p-4096M-10M:10-X
0.85 -0.6% 0.84 thresh=10M/ext3-10dd-4k-8p-4096M-10M:10-X
1.41 -4.4% 1.35 thresh=10M/ext3-1dd-4k-8p-4096M-10M:10-X
1.43 -2.7% 1.40 thresh=10M/ext3-2dd-4k-8p-4096M-10M:10-X
0.77 -3.0% 0.75 thresh=10M/ext4-10dd-4k-8p-4096M-10M:10-X
1.39 -3.3% 1.35 thresh=10M/ext4-1dd-4k-8p-4096M-10M:10-X
1.37 -5.1% 1.30 thresh=10M/ext4-2dd-4k-8p-4096M-10M:10-X
0.70 -2.5% 0.68 thresh=10M/xfs-10dd-4k-8p-4096M-10M:10-X
2.11 -3.7% 2.03 thresh=10M/xfs-1dd-4k-8p-4096M-10M:10-X
1.77 -1.0% 1.75 thresh=10M/xfs-2dd-4k-8p-4096M-10M:10-X
0.86 +10.3% 0.94 thresh=1M/btrfs-10dd-4k-8p-4096M-1M:10-X
0.66 +14.0% 0.76 thresh=1M/btrfs-1dd-4k-8p-4096M-1M:10-X
0.57 +11.8% 0.63 thresh=1M/btrfs-2dd-4k-8p-4096M-1M:10-X
1.89 +8.8% 2.06 thresh=1M/ext3-10dd-4k-8p-4096M-1M:10-X
3.20 -0.5% 3.19 thresh=1M/ext3-1dd-4k-8p-4096M-1M:10-X
2.77 +0.1% 2.77 thresh=1M/ext3-2dd-4k-8p-4096M-1M:10-X
2.00 +0.3% 2.01 thresh=1M/ext4-10dd-4k-8p-4096M-1M:10-X
3.16 +1.5% 3.21 thresh=1M/ext4-1dd-4k-8p-4096M-1M:10-X
2.52 -0.9% 2.50 thresh=1M/ext4-2dd-4k-8p-4096M-1M:10-X
1.84 +0.7% 1.85 thresh=1M/xfs-10dd-4k-8p-4096M-1M:10-X
2.82 +0.3% 2.82 thresh=1M/xfs-1dd-4k-8p-4096M-1M:10-X
2.27 -0.3% 2.26 thresh=1M/xfs-2dd-4k-8p-4096M-1M:10-X
113.05 +9.9% 124.25 TOTAL cpu_system


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