Re: heavy VM load due to revamped pagebuf locking?

[Andi Kleen <ak@suse.de>]

On Thu, Apr 04, 2002 at 11:13:39AM -0500, HABBINGA,ERIK (HP-Loveland,ex1) wrote:
> I've updated to 2.4.18 w/ a XFS CVS download from 03/29/2002.  During SPEC
> testing, the VM takes over all CPU load as pagebuf_iostart starts waiting
> for memory, and then kmalloc starts waiting for memory.  All of this time
> spent in shrink_cache causes the SPEC test to time out.  Once the test
> stops, the box settles down and VM CPU load goes away.    All of the
> shrink_cache functions are waiting for schedule() to come back, because of
> the test for current->need_resched at the top of the shrink_cache loop.  For
> grins, I commented out that test, and now many nfsd processes are sitting in
> _pagebuf_find_lockable_buffer->pagebuf_iostart's call to pagebuf_iowait.
> Could the revamped pagebuf locking cause this behaviour?

You could test ist. Just revert that TAKE and test again.

-Andi