[xfs-masters] [RESEND][PATCH 6/7] xfs: Remove code handling bio_alloc failure with __GFP_WAIT
david at fromorbit.com
Sun Apr 19 20:02:37 CDT 2009
On Wed, Apr 15, 2009 at 04:09:30PM +0530, Nikanth Karthikesan wrote:
> Resending as I accidentally missed Jens earlier.
> Jens, can you merge this as well.
> Remove code handling bio_alloc failure with __GFP_WAIT.
> GFP_NOIO implies __GFP_WAIT.
Not sure that is right. The intent of the code is that if we can't
get a large bio immediately, try a smaller one which is more likely
to succeed when we are under memory pressure. i.e. we will get IO
moving faster than if we waited for a maximally sized biovec to be
IOWs, I don't think __GFP_WAIT is implied by this code, regardless
of what GFP_NOIO actually means now. The same code fragment can be
found in NILFS, and it uses GFP_NOWAIT, not GFP_NOIO. I suspect that
this is what this XFS code should be changed to use to retain the
original intent of the code....
dgc at evostor.com
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