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From: Christoph Hellwig on 28 Jun 2010 05:50
On Mon, Jun 28, 2010 at 09:03:13AM +0200, Jens Axboe wrote:
> It's the patch series from Christoph in my for-linus branch, I intend
> to push it upstream when Linus is back and taking patches.

He's been merging things again since yesterday.

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From: Mark Lord on 28 Jun 2010 10:00
On 28/06/10 03:03 AM, Jens Axboe wrote:
> On 2010-06-28 01:10, Mark Lord wrote:
>> On 10/06/10 12:44 PM, Brian Bloniarz wrote:
...
>>> https://bugzilla.kernel.org/show_bug.cgi?id=15906 has links to the
>>> downstream bugs.
>> ..
>>
>> Jens, this bug has been biting my servers badly here for the past
>> few months -- umount after a backup (from ext4 to ext4) takes 3-4 minutes
>> instead of the expected 3-4 seconds.
>>
>> Is there a patch file for this against 2.6.34 that I (and others) could use?
>
> It's the patch series from Christoph in my for-linus branch, I intend
> to push it upstream when Linus is back and taking patches.
...

Still looking for a *patch* to fix this here.

I found these two:

http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=e913fc825dc685a444cb4c1d0f9d32f372f5986
http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=30fd1e551a730d942e91109762c942786be0ef7c

But they don't apply cleanly to 2.6.34.

Anyone?


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From: Brian Bloniarz on 28 Jun 2010 10:10
On 06/28/2010 09:51 AM, Mark Lord wrote:
> On 28/06/10 03:03 AM, Jens Axboe wrote:
>> On 2010-06-28 01:10, Mark Lord wrote:
>>> On 10/06/10 12:44 PM, Brian Bloniarz wrote:
> ..
>>>> https://bugzilla.kernel.org/show_bug.cgi?id=15906 has links to the
>>>> downstream bugs.
>>> ..
>>>
>>> Jens, this bug has been biting my servers badly here for the past
>>> few months -- umount after a backup (from ext4 to ext4) takes 3-4
>>> minutes
>>> instead of the expected 3-4 seconds.
>>>
>>> Is there a patch file for this against 2.6.34 that I (and others)
>>> could use?
>>
>> It's the patch series from Christoph in my for-linus branch, I intend
>> to push it upstream when Linus is back and taking patches.
> ..
>
> Still looking for a *patch* to fix this here.
>
> I found these two:
>
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=e913fc825dc685a444cb4c1d0f9d32f372f5986
>
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=30fd1e551a730d942e91109762c942786be0ef7c
>
>
> But they don't apply cleanly to 2.6.34.
>
> Anyone?

Don't use those, they have bugs and have since been reverted.

Links to the patch series that Jens mentions are below. I doubt they
apply cleanly to older kernels. Somebody's probably going to need to
take a crack at backporting them eventually (I could try, even), but
I don't know anybody has yet.

Christoph Hellwig (8):
writeback: fix writeback completion notifications
writeback: queue work on stack in writeback_inodes_sb
writeback: enforce s_umount locking in writeback_inodes_sb
writeback: fix writeback_inodes_wb from writeback_inodes_sb
writeback: simplify wakeup_flusher_threads
writeback: simplify and split bdi_start_writeback
writeback: add missing requeue_io in writeback_inodes_wb
writeback: fix pin_sb_for_writeback

http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=2c99721ec6a55b2c1e7ba94945bbdae454e11308
http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=ebf51611db2cfa33d056b4428f13275f81732fd5
http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=de3f848fbc24f71174f3bcc7513b5a3fafb37bac
http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=e15e123275b3ca3eeb378136046ab78eab214169
http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=dcac2e708d8f8af1a220dd238027af5b4aedfc12
http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=8163b53a6bfbfa14ae83f8cdbf536f9c191d3279
http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=22e53a2ca88690c711a954d3c652b468a5e94272
http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=7eed7cc254e71352e5e2e642c70a9b04cd28cc76
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From: Mark Lord on 28 Jun 2010 10:40
On 28/06/10 10:05 AM, Brian Bloniarz wrote:
> On 06/28/2010 09:51 AM, Mark Lord wrote:
...
>> I found these two:
>>
>> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=e913fc825dc685a444cb4c1d0f9d32f372f5986
>>
>> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=30fd1e551a730d942e91109762c942786be0ef7c
>>
>>
>> But they don't apply cleanly to 2.6.34.
>>
>> Anyone?
>
> Don't use those, they have bugs and have since been reverted.
>
> Links to the patch series that Jens mentions are below. I doubt they
> apply cleanly to older kernels. Somebody's probably going to need to
> take a crack at backporting them eventually (I could try, even), but
> I don't know anybody has yet.
>
> Christoph Hellwig (8):
> writeback: fix writeback completion notifications
> writeback: queue work on stack in writeback_inodes_sb
> writeback: enforce s_umount locking in writeback_inodes_sb
> writeback: fix writeback_inodes_wb from writeback_inodes_sb
> writeback: simplify wakeup_flusher_threads
> writeback: simplify and split bdi_start_writeback
> writeback: add missing requeue_io in writeback_inodes_wb
> writeback: fix pin_sb_for_writeback
>
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=2c99721ec6a55b2c1e7ba94945bbdae454e11308
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=ebf51611db2cfa33d056b4428f13275f81732fd5
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=de3f848fbc24f71174f3bcc7513b5a3fafb37bac
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=e15e123275b3ca3eeb378136046ab78eab214169
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=dcac2e708d8f8af1a220dd238027af5b4aedfc12
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=8163b53a6bfbfa14ae83f8cdbf536f9c191d3279
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=22e53a2ca88690c711a954d3c652b468a5e94272
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=7eed7cc254e71352e5e2e642c70a9b04cd28cc76


Thanks. I'll pull those down and backport them here.

Cheers!
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From: Jens Axboe on 28 Jun 2010 13:40
On 28/06/10 16.05, Brian Bloniarz wrote:
> On 06/28/2010 09:51 AM, Mark Lord wrote:
>> On 28/06/10 03:03 AM, Jens Axboe wrote:
>>> On 2010-06-28 01:10, Mark Lord wrote:
>>>> On 10/06/10 12:44 PM, Brian Bloniarz wrote:
>> ..
>>>>> https://bugzilla.kernel.org/show_bug.cgi?id=15906 has links to the
>>>>> downstream bugs.
>>>> ..
>>>>
>>>> Jens, this bug has been biting my servers badly here for the past
>>>> few months -- umount after a backup (from ext4 to ext4) takes 3-4
>>>> minutes
>>>> instead of the expected 3-4 seconds.
>>>>
>>>> Is there a patch file for this against 2.6.34 that I (and others)
>>>> could use?
>>>
>>> It's the patch series from Christoph in my for-linus branch, I intend
>>> to push it upstream when Linus is back and taking patches.
>> ..
>>
>> Still looking for a *patch* to fix this here.
>>
>> I found these two:
>>
>> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=e913fc825dc685a444cb4c1d0f9d32f372f5986
>>
>> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=30fd1e551a730d942e91109762c942786be0ef7c
>>
>>
>> But they don't apply cleanly to 2.6.34.
>>
>> Anyone?
>
> Don't use those, they have bugs and have since been reverted.
>
> Links to the patch series that Jens mentions are below. I doubt they
> apply cleanly to older kernels. Somebody's probably going to need to
> take a crack at backporting them eventually (I could try, even), but
> I don't know anybody has yet.
>
> Christoph Hellwig (8):
> writeback: fix writeback completion notifications
> writeback: queue work on stack in writeback_inodes_sb
> writeback: enforce s_umount locking in writeback_inodes_sb
> writeback: fix writeback_inodes_wb from writeback_inodes_sb
> writeback: simplify wakeup_flusher_threads
> writeback: simplify and split bdi_start_writeback
> writeback: add missing requeue_io in writeback_inodes_wb
> writeback: fix pin_sb_for_writeback
>
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=2c99721ec6a55b2c1e7ba94945bbdae454e11308
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=ebf51611db2cfa33d056b4428f13275f81732fd5
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=de3f848fbc24f71174f3bcc7513b5a3fafb37bac
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=e15e123275b3ca3eeb378136046ab78eab214169
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=dcac2e708d8f8af1a220dd238027af5b4aedfc12
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=8163b53a6bfbfa14ae83f8cdbf536f9c191d3279
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=22e53a2ca88690c711a954d3c652b468a5e94272
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commitdiff;h=7eed7cc254e71352e5e2e642c70a9b04cd28cc76

Yes, that's the series.

--
Jens Axboe

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