linux-kernel - Re: [GIT PULL] block/io bits for 2.6.35-rc

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Date:	Mon, 28 Jun 2010 16:55:14 -0400
From:	Mark Lord <kernel@...savvy.com>
To:	Jens Axboe <jaxboe@...ionio.com>
CC:	Brian Bloniarz <bmb@...enacr.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: [GIT PULL] block/io bits for 2.6.35-rc

On 28/06/10 01:32 PM, Jens Axboe wrote:
> On 28/06/10 16.05, Brian Bloniarz wrote:
..
>> 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.
..

Those apply/run on 2.6.34 with one minor change to the sixth patch:
Nuke the final one-liner blob from "simplify and split bdi_start_writeback",
getting rid of this part:

--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -705,9 +705,8 @@ void laptop_mode_timer_fn(unsigned long data)
  	 * We want to write everything out, not just down to the dirty
  	 * threshold
  	 */
-
  	if (bdi_has_dirty_io(&q->backing_dev_info))
-		bdi_start_writeback(&q->backing_dev_info, NULL, nr_pages);
+		bdi_start_writeback(&q->backing_dev_info, nr_pages);
  }
  
  /*
----

The rest applied cleanly, and I don't see any obvious need for an alternative
to the deleted line above.

Cheers



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