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Date:	Mon, 02 Jun 2008 11:45:12 +0900
From:	Akira Fujita <>
To:	Mingming Cao <>
Subject: Re: [RFC][PATCH 6/6] delalloc ENOSPC: improve percpu	counter	accounting

Mingming Cao wrote:
> On Mon, 2008-06-02 at 09:19 +0900, Akira Fujita wrote:
>> Hi,
>>> Mingming Cao wrote:
>>> percpu counter: update center counter when sum per-cpu counter
>>> From: Mingming cao <>
>>> Delayed allocation need to check free blocks at every write time.
>>> percpu_counter_read_positive() is not quit accurate
>>>  but using percpu_counter_sum_positive() for every write
>>> frequently is quite expensive.
>> I couldn't compile the latest ext4 patch qeueu.
>>   LD      fs/ext3/ext3.o
>>   LD      fs/ext3/built-in.o
>>   CC      fs/ext4/balloc.o
>> fs/ext4/balloc.c: In function ‘ext4_has_free_blocks’:
>> fs/ext4/balloc.c:1629: error: implicit declaration of function ‘percpu_counter_sum_positive_set’
>>> +		    percpu_counter_sum_positive_set(&sbi->s_freeblocks_counter);
>> Maybe the above line which in percpucounter-add-sum-and-set-function.patch
>> is percpu_counter_sum_and_set(&sbi->s_freeblocks_couter).
> oops. Updated patch queue, please check again.

I confirmed that I could compile the latest ext4 patch queue correctly.
Thanks.   :-)

Akira Fujita
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