linux-kernel - Re: [fuse-devel] Horrible mmap write performance (kernel writeback issue?)

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Message-ID: <CA+icZUXjBim3cNhTLK3V0ko_iRsYAKV9Nhavg4pm24bNKTnp-A@mail.gmail.com>
Date:	Mon, 2 May 2016 11:39:34 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Howard Cochran <hcochran@...nelspring.com>
Cc:	Jakob Unterwurzacher <jakobunt@...il.com>,
	Tejun Heo <tj@...nel.org>,
	Ashish Sangwan <ashishsangwan2@...il.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [fuse-devel] Horrible mmap write performance (kernel writeback issue?)

On 4/25/16, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Wed, Apr 20, 2016 at 3:35 AM, Howard Cochran
> <hcochran@...nelspring.com> wrote:
>> On Mon, Apr 18, 2016 at 5:06 PM, Jakob Unterwurzacher
>> <jakobunt@...il.com> wrote:
>>> On 12.04.2016 13:09, Tejun Heo wrote:
>>>>>
>>>>> Probably you want to look into:
>>>>> https://lkml.org/lkml/2016/3/10/21
>>>>>
>>>>> The patch mentioned above solves the issue for me.
>>>>
>>>> Heh, I tracked it down to wb_over_bg_thresh() and fell asleep.  Yeah,
>>>> that is the right fix.
>>>
>>> Works wonderfully now, thanks to everybody involved. Is it too late for
>>> 4.6?
>>>
>>> Best regards,
>>> Jakob
>>>
>> Jakob, et. al.
>>
>> You're welcome.  That performance problem stumped me for a couple of
>> weeks until tracked it down and submitted the fix.
>>
>
> What has happened to "writeback: Fix performance regression in
> wb_over_bg_thresh()"?
> I checked Linux v4.6-rc5, it is not included.
> Is it in another Git tree? If yes, where?
>

Ping!

Patch from Howard ist still not in Linus upstream aka Linux v4.6-rc6.
Comments, please.

- sed@ -