linux-kernel - Re: single aio thread is migrated crazily by scheduler

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Message-ID: <20191115141610.GA3283@ming.t460p>
Date:   Fri, 15 Nov 2019 22:16:10 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeff Moyer <jmoyer@...hat.com>,
        Dave Chinner <dchinner@...hat.com>,
        Eric Sandeen <sandeen@...hat.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>
Subject: Re: single aio thread is migrated crazily by scheduler

On Fri, Nov 15, 2019 at 08:09:25AM +0800, Ming Lei wrote:
> On Thu, Nov 14, 2019 at 02:14:34PM +0100, Peter Zijlstra wrote:
> > On Thu, Nov 14, 2019 at 07:31:53PM +0800, Ming Lei wrote:
> > > Hi Guys,
> > > 
> > > It is found that single AIO thread is migrated crazely by scheduler, and
> > > the migrate period can be < 10ms. Follows the test a):
> > 
> > What does crazy mean? Does it cycle through the L3 mask?
> > 
> 
> The single thread AIO thread is migrated in several milliseconds once.

Today I found the migrate rate of single fio IO thread can reach
11~12K/sec when I run './xfs_complete 512' on another real machine
(single numa node, 8 cores).

And the number is very close to IOPS of the test, that said the fio
IO thread can be migrated once just when completing one IO on the
scsi_debug device.


Thanks,
Ming