Re: regression: 100% io-wait with 2.6.24-rcX

[Fengguang Wu]

On Sun, Jan 13, 2008 at 10:49:31AM +0100, Joerg Platte wrote:
> register_jprobe(ext2_writepage) = 0
> register_jprobe(requeue_io) = 0
> register_kprobe(submit_bio) = 0
> requeue_io:
> inode 114019(sda7/.kde) count 2,2 size 0 pages 1
> 0	2	0	U____
> requeue_io:
> inode 114025(sda7/cache-ibm) count 2,1 size 0 pages 1
> 0	2	0	U____
> requeue_io:
> inode 114029(sda7/socket-ibm) count 2,3 size 0 pages 1
> 0	2	0	U____
> requeue_io:
> inode 114017(sda7/0266584877) count 3,6 size 0 pages 1
> 0	2	0	U____

It helps. Thank you, Joerg!

The .kde/cache-ibm/socket-ibm/0266584877 above are directories.
It's weird that dirs would have their own mappings in ext2. In
particular this bug is triggered because the dir mapping page has
PAGECACHE_TAG_DIRTY set and PG_dirty cleared, staying in an
inconsistent state.

Fengguang

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