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Date: Mon, 1 Dec 2014 13:46:45 +0200 From: "Michael S. Tsirkin" <mst@...hat.com> To: Cornelia Huck <cornelia.huck@...ibm.com> Cc: David Hildenbrand <dahi@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>, rusty@....ibm.com, nab@...ux-iscsi.org, pbonzini@...hat.com, thuth@...ux.vnet.ibm.com, Rusty Russell <rusty@...tcorp.com.au>, virtualization@...ts.linux-foundation.org, linux-api@...r.kernel.org Subject: Re: [PATCH v7 16/46] virtio_blk: v1.0 support On Mon, Dec 01, 2014 at 12:33:15PM +0100, Cornelia Huck wrote: > On Mon, 1 Dec 2014 11:26:58 +0200 > "Michael S. Tsirkin" <mst@...hat.com> wrote: > > > For some places on data path, it might be worth it > > to cache the correct value e.g. as part of device > > structure. This replaces a branch with a memory load, > > so the gain would have to be measured, best done > > separately? > > I think we'll want to do some measuring once the basic structure is > in place anyway. What's meant by in place here? > We should make sure that e.g. s390 only takes minor > hit due to all that swapping that is needed for standard-compliant > devices. Caching the value might certainly help in some paths. Well, this is queued in linux-next for 3.19, so now's the time to do it :) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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