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Message-ID: <x49bnoupulp.fsf@segfault.boston.devel.redhat.com> Date: Wed, 29 Oct 2014 15:02:42 -0400 From: Jeff Moyer <jmoyer@...hat.com> To: "Jason B. Akers" <jason.b.akers@...el.com> Cc: linux-ide@...r.kernel.org, axboe@...com, kapil.karkra@...el.com, dan.j.williams@...el.com, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH 1/5] block, ioprio: include caching advice via ionice "Jason B. Akers" <jason.b.akers@...el.com> writes: > From: Dan Williams <dan.j.williams@...el.com> > > Steal one unused bit from the priority class and two bits from the > priority data, to implement a 3 bit cache-advice field. Similar to the > page cache advice from fadvise() these hints are meant to be consumed > by hybrid drives. Solid State Hyrbid-Drives, as defined by the SATA-IO > Specification, implement up to a 4-bit cache priority that can be > specified along with a FPDMA command. ionice is about setting an I/O scheduling class for a *process*. So, unless I've missed something, this does not seem like the right interface for passing I/O hints. You mention fadvise hints, which sounds like a good fit (and madvise would be equally interesting), but I don't see where you've wired them up in this patch set. Did I miss it? Cheers, Jeff -- 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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