Messages in this thread | | | From | Logan Gunthorpe <> | Date | Mon, 3 Sep 2018 16:26:27 -0600 | Subject | Re: [PATCH v5 07/13] block: Add PCI P2P flag for request queue and check support for requests |
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On 01/09/18 02:28 AM, Christoph Hellwig wrote: > On Thu, Aug 30, 2018 at 01:11:18PM -0600, Jens Axboe wrote: >> I think this belongs in the caller - both the validity check, and >> passing in NOMERGE for this type of request. I don't want to impose >> this overhead on everything, for a pretty niche case. > > It is just a single branch, which will be predicted as not taken > for non-P2P users. The benefit is that we get proper error checking > by doing it in the block code.
I personally agree with Christoph. But if there's consensus in the other direction or this is a real blocker moving this forward, I can remove it for the next version.
Logan
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