On Mon, Dec 04, 2006 at 12:32:17AM -0800, Andrew Morton wrote:
> On Mon, 4 Dec 2006 16:09:02 +0800
> Fengguang Wu <[email protected]> wrote:
>
> > Got the following message when doing some benchmarks.
> > I guess we should not hold inode_lock on calling invalidate_inode_pages().
> > Any ideas?
> >
> > Fengguang Wu
> >
> > =======================================================
> > [ INFO: possible circular locking dependency detected ]
> > 2.6.19-rc6-mm2 #3
> > -------------------------------------------------------
> > rabench.sh/7467 is trying to acquire lock:
> > (&journal->j_list_lock){--..}, at: [<ffffffff8113bdbc>] journal_try_to_free_buffers+0xdc/0x1c0
> >
> > but task is already holding lock:
> > (inode_lock){--..}, at: [<ffffffff810fe857>] drop_pagecache+0x67/0x120
> >
> > which lock already depends on the new lock.
> >
>
> drat, I was afraid someone would notice.
>
> It's Hard To Fix. Removing /proc/sys/vm/drop_pagecache would in fact be
> my preferred fix.
Or fix drop_pagecache_sb():
Repeat until all possible pages freed:
grab and save some inodes to a buffer
zip their pages outside of inode_lock
Takes much more code though.
I'd like to move this sysctl interface to the upcoming /proc/filecache.
Being a module, it helps reduce the kernel size :)
Fengguang Wu
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