linux-kernel - Re: [PATCHSET v3][RFC] Make background writeback not suck

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Date:	Thu, 31 Mar 2016 21:33:55 -0600
From:	Jens Axboe <axboe@...com>
To:	Dave Chinner <david@...morbit.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-block@...r.kernel.org>
Subject: Re: [PATCHSET v3][RFC] Make background writeback not suck

On 03/31/2016 09:29 PM, Jens Axboe wrote:
>> I'm not changing the host kernels - it's a production machine and so
>> it runs long uptime testing of stable kernels.  (e.g. catch slow
>> memory leaks, etc). So if you've disabled throttling in the guest, I
>> can't test the throttling changes.
>
> Right, that'd definitely hide the problem for you. I'll see if I can get
> it in a reproducible state and take it from there.

Though on the guest, if you could try with just this one applied:

http://git.kernel.dk/cgit/linux-block/commit/?h=wb-buf-throttle&id=f21fb0e42c7347bd639a17341dcd3f72c1a30d29

I'd appreciate it. It won't disable the throttling in the guest, just 
treat META and PRIO a bit differently.

-- 
Jens Axboe