| Date | Fri, 4 Apr 2008 13:46:00 +0200 | From | Jens Axboe <> | Subject | Re: [patch 0/15] LogFS take five |
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On Tue, Apr 01 2008, joern@logfs.org wrote: > And it is currently reasonably simple to run into a deadlock when > using logfs on a block device. The problem appears to be the block > layer allocating memory for its cache without GFP_NOFS, so that under > memory pressure logfs writes through block layer may recurse back to > logfs writes.
So you mean for writes through the page cache, you are seeing pages allocated with __GFP_FS set?
> Not entirely sure who is to blame for this bug and how to > solve it.
A good starting point would be doing a stack trace dump in logfs if you see such back recursion into the fs. A quick guess would be a missing setting of mapping gfp mask?
-- Jens Axboe
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