[stable] [PATCH 00/16]: Fix writeback regressions in 2.6.32

[Greg KH]

On Tue, Aug 10, 2010 at 11:28:48AM +0200, Stefan Bader wrote:
> Impact: 2.6.32 is facing some serious performance regression which are visible
> plainly when unmounting filesystems as async writeback degrades to sync in
> that case. But there seem to be other less visible problems as well.
> I believe this set of patches also would be benefitial to go into upstream
> stable.
> 
> Fix: This series of patches was picked and backported when needed to apply
> to 2.6.32.y (there is another set for 2.6.34.y[1]). It probably does not
> solve all currently known problems but testing has shown considerable
> improvements. At the beginning of the set there are some patches that were
> picked to make the later patches applicable. Only one of them is a bit more
> intrusive the others rather trivial.
> 
> Testcase: Unmounting a fs that still has larger amounts of data to write back
> to disk will take noticably longer time to complete (IIRC might be 30min).
> Also general responsiveness was reported to improve. Currently there are no
> known regressions reported when testing this backport.

Jens, what do you think about this series?

thanks,

greg k-h