Re: Very slow qemu device access

2020-08-09 Thread Matthew Wilcox
On Mon, Aug 10, 2020 at 11:10:49AM +0800, Ming Lei wrote: > On Sun, Aug 09, 2020 at 03:25:22PM +0100, Matthew Wilcox wrote: > > On Sun, Aug 09, 2020 at 10:40:05AM +0800, Ming Lei wrote: > > > Hello Matthew, > > > > > > On Fri, Aug 07, 2020 at 06:44:16PM +0100, Matthew Wilcox wrote: > > > > > > >

Re: Very slow qemu device access

2020-08-09 Thread Ming Lei
On Sun, Aug 09, 2020 at 03:25:22PM +0100, Matthew Wilcox wrote: > On Sun, Aug 09, 2020 at 10:40:05AM +0800, Ming Lei wrote: > > Hello Matthew, > > > > On Fri, Aug 07, 2020 at 06:44:16PM +0100, Matthew Wilcox wrote: > > > > > > Everything starts going very slowly after this commit: > > > > > >

Re: Very slow qemu device access

2020-08-09 Thread Matthew Wilcox
On Sun, Aug 09, 2020 at 10:40:05AM +0800, Ming Lei wrote: > Hello Matthew, > > On Fri, Aug 07, 2020 at 06:44:16PM +0100, Matthew Wilcox wrote: > > > > Everything starts going very slowly after this commit: > > > > commit 37f4a24c2469a10a4c16c641671bd766e276cf9f (refs/bisect/bad) > > Author:

Re: Very slow qemu device access

2020-08-08 Thread Ming Lei
Hello Matthew, On Fri, Aug 07, 2020 at 06:44:16PM +0100, Matthew Wilcox wrote: > > Everything starts going very slowly after this commit: > > commit 37f4a24c2469a10a4c16c641671bd766e276cf9f (refs/bisect/bad) > Author: Ming Lei > Date: Tue Jun 30 22:03:57 2020 +0800 > > blk-mq:

Very slow qemu device access

2020-08-07 Thread Matthew Wilcox
Everything starts going very slowly after this commit: commit 37f4a24c2469a10a4c16c641671bd766e276cf9f (refs/bisect/bad) Author: Ming Lei Date: Tue Jun 30 22:03:57 2020 +0800 blk-mq: centralise related handling into blk_mq_get_driver_tag Move .nr_active update and request