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possible fsync02() xfs slowness regression on power7

To: xfs@xxxxxxxxxxx
Subject: possible fsync02() xfs slowness regression on power7
From: CAI Qian <caiqian@xxxxxxxxxx>
Date: Thu, 28 Feb 2013 04:28:35 -0500 (EST)
Cc: Steve Best <sbest@xxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <130819766.6999797.1362043338279.JavaMail.root@xxxxxxxxxx>
This LTP test starting to fail using the latest upstream kernel on one of the 
systems here, http://tinyurl.com/bngwouj

# ./fsync02
fsync02     1  TFAIL  :  fsync took too long: 252.000000 seconds; max_block: 214

When it is working, the test is almost returned immediately. The bisecting so 
indicated that one or a few of the following could be culprits.

# git log --pretty=oneline 
b199c8a4ba11879df87daad496ceee41fdc6aa82 xfs: Pull EFI/EFD handling out from 
under the AIL lock
9c5f8414efd5eeed9f498d4170337a3eb126341f xfs: fix EFI transaction cancellation.
821eb21d97a8b686649c08b7284d0b9f34d0e138 xfs: connect up buffer reclaim 
priority hooks
430cbeb86fdcbbdabea7d4aa65307de8de425350 xfs: add a lru to the XFS buffer cache
ff57ab21995a8636cfc72efeebb09cc6034d756f xfs: convert xfsbud shrinker to a 
per-buftarg shrinker.
1a427ab0c1b205d1bda8da0b77ea9d295ac23c57 xfs: convert pag_ici_lock to a spin 
1a3e8f3da09c7082d25b512a0ffe569391e4c09a xfs: convert inode cache lookups to 
use RCU locking
d95b7aaf9ab6738bef1ebcc52ab66563085e44ac xfs: rcu free inodes
6e857567dbbfe14dd6cc3f7414671b047b1ff5c7 xfs: don't truncate prealloc from 
frequently accessed inodes
055388a3188f56676c21e92962fc366ac8b5cb72 xfs: dynamic speculative EOF 
622d81494fa32343a4b97b607619656c7a4a6d1a xfs: use KM_NOFS for allocations 
during attribute list operations
dcfcf20512cb517ac18b9433b676183fa1257911 xfs: provide a inode iolock lockdep 
489a150f6454e2cd93d9e0ee6d7c5a361844f62a xfs: factor duplicate code in 
xfs_alloc_ag_vextent_near into a helper
9f9baab38dacd11fe6095a1e59f3783a305f7020 xfs: clean up 
ecff71e677c6d469f525dcf31ada709d5858307c xfs: simplify xfs_map_at_offset
aeea1b1f81800e362a3aca86d769d02e137a8fa7 xfs: refactor xfs_vm_writepage
2fa24f92530edaf86c3b5f662464e0d2e3b3e517 xfs: remove the all_bh flag from 
ed1e7b7e484dfb64168755613d499f32a97409bd xfs: remove xfs_probe_cluster
8ff2957d581582890693affc09920108a67cb05d xfs: simplify xfs_map_blocks
a206c817c864583c44e2f418db8e6c7a000fbc38 xfs: kill xfs_iomap

CAI Qian

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