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

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Message-ID: <CA+icZUUJJ8q00DTBFdnRKndLM0GuDU+CvrKzkmHOTDvKq7GuJQ@mail.gmail.com>
Date:	Wed, 11 May 2016 09:07:14 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Jakob Unterwurzacher <jakobunt@...il.com>
Cc:	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 5/11/16, Jakob Unterwurzacher <jakobunt@...il.com> wrote:
> Landed in 4.6-rc7:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=74d369443325063a5f0260e63971decb950fd8fa
>

Top-posting :-(.

Linux v4.4.10 and v4.5.4 final (currently in review as
4.4.10-rc1/4.5.4-rc1) will have it, too.

- Sedat -

> On Mon, May 2, 2016 at 11:39 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>
>> 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@ -
>>
>