lkml.org 
[lkml]   [2008]   [Apr]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 0/15] LogFS take five
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



\
 
 \ /
  Last update: 2008-04-04 13:53    [W:0.182 / U:0.644 seconds]
©2003-2014 Jasper Spaans. Advertise on this site