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Re: WAPBL patch for testing
On Sat, Nov 01, 2008 at 09:09:05AM +0100, Joerg Sonnenberger wrote:
> On Sat, Nov 01, 2008 at 07:27:30AM +0100, Juergen Hannken-Illjes wrote:
> > This would bring back a deadlock (see Rev. 1.12 of genfs_io.c). We have
> > to take the wapbl LOCK before we lock pages.
> How should this deadlock happen? It has been proven that the changes
> *did* introduce a deadlock and one that is very easy to trigger.
I have seen this deadlock on a dual-cpu machine while running three
One thread has a wapbl transaction, calls VOP_GETPAGES and wants
to busy a page while another thread calls VOP_PUTPAGES on the
same vnode, takes pages busy and wants to start a wapbl transaction.
Juergen Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig
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