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SubjectRe: 4.4-final: 28 bioset threads on small notebook
On Sun, Feb 21, 2016 at 05:40:59PM +0800, Ming Lei wrote:
> On Sun, Feb 21, 2016 at 2:43 PM, Ming Lin-SSI <ming.l@ssi.samsung.com> wrote:
> >>-----Original Message-----
> >
> > So it's almost already "per request_queue"
>
> Yes, that is because of the following line:
>
> q->bio_split = bioset_create(BIO_POOL_SIZE, 0);
>
> in blk_alloc_queue_node().
>
> Looks like this bio_set doesn't need to be per-request_queue, and
> now it is only used for fast-cloning bio for splitting, and one global
> split bio_set should be enough.

It does have to be per request queue for stacking block devices (which includes
loopback).

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