linux-ext4 - Re: [RFC][PATCH 6/6] delalloc ENOSPC: improve percpu counter accounting accurate

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 02 Jun 2008 09:19:54 +0900
From:	Akira Fujita <a-fujita@...jp.nec.com>
To:	cmm@...ibm.com
CC:	linux-ext4@...r.kernel.org
Subject: Re: [RFC][PATCH 6/6] delalloc ENOSPC: improve percpu counter	accounting
 accurate

Hi,

> Mingming Cao wrote:
> percpu counter: update center counter when sum per-cpu counter
>
> From: Mingming cao <cmm@...ibm.com>
>
> 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).

Thanks,
Akira Fujita
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html