Re: [PATCH] backing dev unplugging

From: Jens Axboe
Date: Wed Mar 10 2004 - 15:24:25 EST

On Wed, Mar 10 2004, Kenneth Chen wrote:
> Andrew Morton wrote on Wednesday, March 10, 2004 11:56 AM
> > Jens Axboe <axboe@xxxxxxx> wrote:
> > >
> > > Here's a first cut at killing global plugging of block devices to reduce
> > > the nasty contention blk_plug_lock caused. This introduceds per-queue
> > > plugging, controlled by the backing_dev_info.
> >
> > This is such an improvement over what we have now it isn't funny.
> >
> > Ken, the next -mm is starting to look like linux-3.1.0 so I think it
> > would be best if you could benchmark Jens's patch against 2.6.4-rc2-mm1.
> I'm planning on couple experiments: one is just Jens's change on top of
> what we have so we can validate the backing dev unplug. Then we will run
> 2.6.4-rc2-mm1 + Jens's patch.

It'll be hard to apply the patch against anything but -mm, since it
builds (or at least will conflict with) other changes in there. I
deliberately made a -mm version this time though I usually make -linus
and adapt if necessary, for Andrew to get some testing on this.

Jens Axboe

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