Messages in this thread |  | | Date | Tue, 9 Jun 2015 12:00:54 +0900 | From | Tejun Heo <> | Subject | Re: [PATCH 5/8] cfq-iosched: remove @gfp_mask from cfq_find_alloc_queue() |
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Hey, Jeff.
On Mon, Jun 08, 2015 at 04:27:10PM -0400, Jeff Moyer wrote: > >> Remove @gfp_mask from cfq_find_alloc_queue() and propagate the changes > >> to its callers. This simplifies the function quite a bit and will > >> help making async queues per-cfq_group. > > > > Sorry, I disagree with this patch. You've changed it so that all cfqq > > allocations are GFP_ATOMIC, and most, if not all of them simply don't > > need to be. > > It occurs to me that replacing GFP_ATOMIC with GFP_NOWAIT in your patch > would address my concerns, and patches 6-8 would apply almost as-is. > What do you think about that?
Oh yeah, it's okay to fail these allocations under memory pressure. GFP_NOWAIT is the better pick here. It's GFP_ATOMIC mostly due to historic copy&paste anyway. I'll change them to GFP_NOWAIT.
Thanks.
-- tejun
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