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SubjectRe: [PATCH 0/7] writeback: avoid touching dirtied_when on blocked inodes
Hi,

I get some test results for this patch: basically it's good until
patch 4. Further more, I got minor regressions when apply several
combinations of patches 5-7 and Jan's patch for the I_SYNC case.

[PATCH 1/7] writeback: introduce queue b_more_io_wait
[PATCH 2/7] writeback: avoid redirtying when ->write_inode failed to clear I_DIR
[PATCH 3/7] writeback: update wb->last_active on written pages/inodes
[PATCH 4/7] writeback: Retry kupdate work early if we need to retry some inode w

[PATCH 5/7] writeback: requeue_io_wait() on pages_skipped inode
[PATCH 6/7] writeback: requeue_io_wait() on blocked inode
[PATCH 7/7] writeback: requeue_io_wait() when failed to grab superblock

Based on the below results, I'd like to push only patches 1-4 to
linux-next and hold back the other patches for more investigation.

Overall throughput increases +1.2% if applying only patches 1-4:

3.1.0-rc9-ioless-full-next-20111014+ 3.1.0-rc9-ioless-full-more_io_wait-5-next-20111014+
------------------------ ------------------------
56.47 +3.1% 58.22 thresh=100M/btrfs-10dd-4k-8p-4096M-100M:10-X
56.28 +1.6% 57.20 thresh=100M/btrfs-1dd-4k-8p-4096M-100M:10-X
56.11 +2.6% 57.56 thresh=100M/btrfs-2dd-4k-8p-4096M-100M:10-X
37.86 +3.5% 39.20 thresh=100M/ext3-10dd-4k-8p-4096M-100M:10-X
45.91 +2.2% 46.92 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
41.87 +2.7% 42.98 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
45.68 +1.7% 46.43 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
55.74 +1.2% 56.41 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
53.32 +0.7% 53.71 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
46.20 -2.6% 44.99 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
55.72 +3.9% 57.90 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
54.01 +0.4% 54.21 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
55.08 +2.0% 56.17 thresh=1G/btrfs-100dd-4k-8p-4096M-1024M:10-X
55.49 +1.3% 56.24 thresh=1G/btrfs-10dd-4k-8p-4096M-1024M:10-X
55.38 +1.7% 56.30 thresh=1G/btrfs-1dd-4k-8p-4096M-1024M:10-X
36.70 +0.7% 36.96 thresh=1G/ext3-100dd-4k-8p-4096M-1024M:10-X
40.64 +0.3% 40.77 thresh=1G/ext3-10dd-4k-8p-4096M-1024M:10-X
48.65 +1.6% 49.45 thresh=1G/ext3-1dd-4k-8p-4096M-1024M:10-X
49.84 -2.6% 48.53 thresh=1G/ext4-100dd-4k-8p-4096M-1024M:10-X
56.03 -1.2% 55.34 thresh=1G/ext4-10dd-4k-8p-4096M-1024M:10-X
57.42 +0.2% 57.52 thresh=1G/ext4-1dd-4k-8p-4096M-1024M:10-X
45.74 +0.4% 45.92 thresh=1G/xfs-100dd-4k-8p-4096M-1024M:10-X
54.19 -0.7% 53.79 thresh=1G/xfs-10dd-4k-8p-4096M-1024M:10-X
55.93 -0.4% 55.72 thresh=1G/xfs-1dd-4k-8p-4096M-1024M:10-X
35.78 -0.0% 35.77 thresh=8M/ext4-10dd-4k-8p-4096M-8M:10-X
55.29 +2.1% 56.43 thresh=8M/ext4-1dd-4k-8p-4096M-8M:10-X
51.12 +1.6% 51.94 thresh=8M/ext4-2dd-4k-8p-4096M-8M:10-X
31.21 +0.9% 31.48 thresh=8M/xfs-10dd-4k-8p-4096M-8M:10-X
54.10 +3.9% 56.22 thresh=8M/xfs-1dd-4k-8p-4096M-8M:10-X
46.97 +3.8% 48.75 thresh=8M/xfs-2dd-4k-8p-4096M-8M:10-X
1490.73 +1.2% 1509.03 TOTAL write_bw

Overall throughput after the patchset increases +1.6% if replacing
patch 5 with another patch to remove redirty_tail() on pages_skipped:

3.1.0-rc9-ioless-full-more_io_wait-next-20111014+ 3.1.0-rc9-ioless-full-more_io_wait-7-next-20111014+
------------------------ ------------------------
46.22 +0.8% 46.58 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
42.19 +1.2% 42.68 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
45.50 +1.2% 46.06 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
54.51 +0.9% 54.97 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
53.19 +1.2% 53.83 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
43.98 +0.3% 44.11 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
55.76 +2.7% 57.25 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
52.94 +2.5% 54.29 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
54.52 +1.6% 55.36 thresh=1G/btrfs-100dd-4k-8p-4096M-1024M:10-X
54.94 +0.8% 55.40 thresh=1G/btrfs-10dd-4k-8p-4096M-1024M:10-X
53.91 +1.9% 54.96 thresh=1G/btrfs-1dd-4k-8p-4096M-1024M:10-X
36.15 +1.0% 36.53 thresh=1G/ext3-100dd-4k-8p-4096M-1024M:10-X
38.25 +6.7% 40.80 thresh=1G/ext3-10dd-4k-8p-4096M-1024M:10-X
45.30 +8.7% 49.24 thresh=1G/ext3-1dd-4k-8p-4096M-1024M:10-X
48.23 +1.5% 48.93 thresh=1G/ext4-100dd-4k-8p-4096M-1024M:10-X
54.21 +0.4% 54.41 thresh=1G/ext4-10dd-4k-8p-4096M-1024M:10-X
56.07 +1.4% 56.86 thresh=1G/ext4-1dd-4k-8p-4096M-1024M:10-X
45.12 -5.8% 42.52 thresh=1G/xfs-100dd-4k-8p-4096M-1024M:10-X
53.94 +1.3% 54.67 thresh=1G/xfs-10dd-4k-8p-4096M-1024M:10-X
55.66 +2.7% 57.15 thresh=1G/xfs-1dd-4k-8p-4096M-1024M:10-X
990.58 +1.6% 1006.59 TOTAL write_bw

But in general the performance is slightly worse when doing anything
more than patches 1-4.

patches 1-4 VS patches 1-4 plus requeue_io_wait() on I_SYNC

3.1.0-rc9-ioless-full-more_io_wait-5-next-20111014+ 3.1.0-rc9-ioless-full-more_io_wait-9-next-20111014+
------------------------ ------------------------
58.22 -3.2% 56.38 thresh=100M/btrfs-10dd-4k-8p-4096M-100M:10-X
57.20 -1.1% 56.56 thresh=100M/btrfs-1dd-4k-8p-4096M-100M:10-X
57.56 -2.3% 56.26 thresh=100M/btrfs-2dd-4k-8p-4096M-100M:10-X
39.20 -0.8% 38.87 thresh=100M/ext3-10dd-4k-8p-4096M-100M:10-X
46.92 +0.1% 46.98 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
42.98 -0.7% 42.70 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
46.43 -0.6% 46.14 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
56.41 +0.1% 56.47 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
53.71 +1.6% 54.58 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
44.99 +0.4% 45.18 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
57.90 -0.4% 57.66 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
54.21 +1.2% 54.85 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
56.17 -0.6% 55.81 thresh=1G/btrfs-100dd-4k-8p-4096M-1024M:10-X
56.24 -1.8% 55.20 thresh=1G/btrfs-10dd-4k-8p-4096M-1024M:10-X
56.30 -2.1% 55.13 thresh=1G/btrfs-1dd-4k-8p-4096M-1024M:10-X
36.96 -2.0% 36.23 thresh=1G/ext3-100dd-4k-8p-4096M-1024M:10-X
40.77 -0.2% 40.68 thresh=1G/ext3-10dd-4k-8p-4096M-1024M:10-X
49.45 -0.6% 49.14 thresh=1G/ext3-1dd-4k-8p-4096M-1024M:10-X
48.53 -1.6% 47.77 thresh=1G/ext4-100dd-4k-8p-4096M-1024M:10-X
55.34 -0.8% 54.89 thresh=1G/ext4-10dd-4k-8p-4096M-1024M:10-X
57.52 -1.5% 56.67 thresh=1G/ext4-1dd-4k-8p-4096M-1024M:10-X
45.92 -7.2% 42.63 thresh=1G/xfs-100dd-4k-8p-4096M-1024M:10-X
53.79 -1.0% 53.25 thresh=1G/xfs-10dd-4k-8p-4096M-1024M:10-X
55.72 +2.4% 57.04 thresh=1G/xfs-1dd-4k-8p-4096M-1024M:10-X
56.22 -2.2% 54.96 thresh=8M/xfs-1dd-4k-8p-4096M-8M:10-X
1284.66 -1.0% 1272.05 TOTAL write_bw

patches 1-4 VS patches 1-4,7 and remove redirty_tail() on pages_skipped

3.1.0-rc9-ioless-full-more_io_wait-5-next-20111014+ 3.1.0-rc9-ioless-full-more_io_wait-8-next-20111014+
------------------------ ------------------------
58.22 -2.9% 56.55 thresh=100M/btrfs-10dd-4k-8p-4096M-100M:10-X
57.20 -2.0% 56.03 thresh=100M/btrfs-1dd-4k-8p-4096M-100M:10-X
57.56 -2.1% 56.38 thresh=100M/btrfs-2dd-4k-8p-4096M-100M:10-X
39.20 -0.4% 39.06 thresh=100M/ext3-10dd-4k-8p-4096M-100M:10-X
46.92 -0.5% 46.68 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
42.98 -1.2% 42.45 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
46.43 -1.2% 45.89 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
56.41 -2.5% 54.98 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
53.71 -1.4% 52.96 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
44.99 -1.4% 44.36 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
57.90 -0.8% 57.42 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
54.21 -0.7% 53.84 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
56.17 -1.1% 55.57 thresh=1G/btrfs-100dd-4k-8p-4096M-1024M:10-X
56.24 -1.1% 55.61 thresh=1G/btrfs-10dd-4k-8p-4096M-1024M:10-X
56.30 -1.5% 55.47 thresh=1G/btrfs-1dd-4k-8p-4096M-1024M:10-X
36.96 -2.0% 36.23 thresh=1G/ext3-100dd-4k-8p-4096M-1024M:10-X
40.77 -0.8% 40.45 thresh=1G/ext3-10dd-4k-8p-4096M-1024M:10-X
49.45 -1.5% 48.71 thresh=1G/ext3-1dd-4k-8p-4096M-1024M:10-X
48.53 -2.8% 47.17 thresh=1G/ext4-100dd-4k-8p-4096M-1024M:10-X
55.34 -2.3% 54.05 thresh=1G/ext4-10dd-4k-8p-4096M-1024M:10-X
57.52 -3.6% 55.47 thresh=1G/ext4-1dd-4k-8p-4096M-1024M:10-X
45.92 +3.0% 47.30 thresh=1G/xfs-100dd-4k-8p-4096M-1024M:10-X
53.79 -2.3% 52.54 thresh=1G/xfs-10dd-4k-8p-4096M-1024M:10-X
55.72 +2.3% 57.02 thresh=1G/xfs-1dd-4k-8p-4096M-1024M:10-X
35.77 -0.7% 35.54 thresh=8M/ext4-10dd-4k-8p-4096M-8M:10-X
56.43 -2.8% 54.86 thresh=8M/ext4-1dd-4k-8p-4096M-8M:10-X
51.94 -2.7% 50.52 thresh=8M/ext4-2dd-4k-8p-4096M-8M:10-X
31.48 -0.7% 31.25 thresh=8M/xfs-10dd-4k-8p-4096M-8M:10-X
56.22 -2.2% 55.00 thresh=8M/xfs-1dd-4k-8p-4096M-8M:10-X
48.75 -2.1% 47.73 thresh=8M/xfs-2dd-4k-8p-4096M-8M:10-X
1509.03 -1.5% 1487.08 TOTAL write_bw

patches 1-4 VS patches 1-4,6 and remove redirty_tail() on pages_skipped

3.1.0-rc9-ioless-full-more_io_wait-5-next-20111014+ 3.1.0-rc9-ioless-full-more_io_wait-6-next-20111014+
------------------------ ------------------------
57.90 -0.7% 57.48 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
54.21 -0.4% 54.01 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
56.17 -1.1% 55.57 thresh=1G/btrfs-100dd-4k-8p-4096M-1024M:10-X
56.24 -1.5% 55.37 thresh=1G/btrfs-10dd-4k-8p-4096M-1024M:10-X
56.30 -1.6% 55.38 thresh=1G/btrfs-1dd-4k-8p-4096M-1024M:10-X
36.96 -1.8% 36.28 thresh=1G/ext3-100dd-4k-8p-4096M-1024M:10-X
40.77 -1.0% 40.37 thresh=1G/ext3-10dd-4k-8p-4096M-1024M:10-X
49.45 -0.5% 49.20 thresh=1G/ext3-1dd-4k-8p-4096M-1024M:10-X
48.53 +0.3% 48.68 thresh=1G/ext4-100dd-4k-8p-4096M-1024M:10-X
55.34 -1.8% 54.34 thresh=1G/ext4-10dd-4k-8p-4096M-1024M:10-X
57.52 -0.9% 57.03 thresh=1G/ext4-1dd-4k-8p-4096M-1024M:10-X
45.92 -0.5% 45.68 thresh=1G/xfs-100dd-4k-8p-4096M-1024M:10-X
53.79 +3.2% 55.52 thresh=1G/xfs-10dd-4k-8p-4096M-1024M:10-X
55.72 +3.2% 57.51 thresh=1G/xfs-1dd-4k-8p-4096M-1024M:10-X
724.81 -0.3% 722.43 TOTAL write_bw

patches 1-4 VS patches 1-4,6,7 and remove redirty_tail() on pages_skipped

3.1.0-rc9-ioless-full-more_io_wait-5-next-20111014+ 3.1.0-rc9-ioless-full-more_io_wait-7-next-20111014+
------------------------ ------------------------
46.92 -0.7% 46.58 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
42.98 -0.7% 42.68 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
46.43 -0.8% 46.06 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
56.41 -2.5% 54.97 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
53.71 +0.2% 53.83 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
44.99 -2.0% 44.11 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
57.90 -1.1% 57.25 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
54.21 +0.1% 54.29 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
56.17 -1.4% 55.36 thresh=1G/btrfs-100dd-4k-8p-4096M-1024M:10-X
56.24 -1.5% 55.40 thresh=1G/btrfs-10dd-4k-8p-4096M-1024M:10-X
56.30 -2.4% 54.96 thresh=1G/btrfs-1dd-4k-8p-4096M-1024M:10-X
36.96 -1.2% 36.53 thresh=1G/ext3-100dd-4k-8p-4096M-1024M:10-X
40.77 +0.1% 40.80 thresh=1G/ext3-10dd-4k-8p-4096M-1024M:10-X
49.45 -0.4% 49.24 thresh=1G/ext3-1dd-4k-8p-4096M-1024M:10-X
48.53 +0.8% 48.93 thresh=1G/ext4-100dd-4k-8p-4096M-1024M:10-X
55.34 -1.7% 54.41 thresh=1G/ext4-10dd-4k-8p-4096M-1024M:10-X
57.52 -1.2% 56.86 thresh=1G/ext4-1dd-4k-8p-4096M-1024M:10-X
45.92 -7.4% 42.52 thresh=1G/xfs-100dd-4k-8p-4096M-1024M:10-X
53.79 +1.6% 54.67 thresh=1G/xfs-10dd-4k-8p-4096M-1024M:10-X
55.72 +2.6% 57.15 thresh=1G/xfs-1dd-4k-8p-4096M-1024M:10-X
1016.26 -1.0% 1006.59 TOTAL write_bw

Thanks,
Fengguang


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