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SubjectRe: [patch 15/26] Slab defrag: Support generic defragmentation for inode slab caches
On Tue, 26 Jun 2007, Andrew Morton wrote:

> > Provide generic functionality that can be used by filesystems that have
> > their own inode caches to also tie into the defragmentation functions
> > that are made available here.
>
> Yes, this is tricky stuff. I have vague ancestral memories that the sort
> of inode work which you refer to here can cause various deadlocks, lockdep
> warnings and such nasties when if we attempt to call it from the wrong
> context (ie: from within fs code).

Right that is likelyi the reason why Michael did his stress test...

> Possibly we could prevent that by skipping all this code if the caller
> didn't have __GFP_FS.

We do. Look at the earlier patch.

> I trust all the code in kick_inodes() was carefuly copied from
> prue_icache() and such places - I didn't check it.

Yup tried to remain faithful to that. We could increase the usefulness if
I could take more liberties with the code in order to actually move an
item instead of simply reclaiming. But its better to first have a proven
correct solution before doing more work on that.


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