Re: pdflush eating a lot of CPU on heavy NFS I/O

[Andrew Morton]

Andrew Morton <akpm@xxxxxxxx> wrote:
>
> Now, that redirtying of the inode _should_ have moved the inode off the
>  s_io list and onto the s_dirty list.  But for some reason it looks like it
>  didn't, so we get stuck in a loop.  I need to think about it a bit more.

OK, it looks like nfs_writepages() might have been encountered the
congested flag and it baled out without doing anything - the inode is still
on the temporary s_io list, and no pages were redirtied, hence the inode
wasn't redirtied, hence it remains stuck on the s_io list.  The patch I
sent will fix that up.

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