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SubjectRe: Bug in kernel 2.6.31, Slow wb_kupdate writeout
From
> An interesting recent-ish change is "writeback: speed up writeback of
> big dirty files."  When I revert the change to __sync_single_inode the
> problem appears to go away and background writeout proceeds at disk
> speed.  Interestingly, that code is in the git commit [2], but not in
> the post to LKML. [3]  This is may not be the fix, but it makes this
> test behave better.

I'm fairly sure this is not fixing the root cause - but putting it at the head
rather than the tail of the queue causes the error not to starve wb_kupdate
for nearly so long - as long as we keep the queue full, the bug is hidden.

M.
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