linux-kernel - Re: [PATCH 02/23] lib: percpu_counter

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Message-ID: <20070817154804.GC24323@filer.fsl.cs.sunysb.edu>
Date:	Fri, 17 Aug 2007 11:48:04 -0400
From:	Josef Sipek <jsipek@....cs.sunysb.edu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	miklos@...redi.hu, akpm@...ux-foundation.org, neilb@...e.de,
	dgc@....com, tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com,
	richard@....demon.co.uk, torvalds@...ux-foundation.org
Subject: Re: [PATCH 02/23] lib: percpu_counter_add

On Thu, Aug 16, 2007 at 09:45:27AM +0200, Peter Zijlstra wrote:
...
> Index: linux-2.6/fs/ext2/balloc.c
> ===================================================================
> --- linux-2.6.orig/fs/ext2/balloc.c
> +++ linux-2.6/fs/ext2/balloc.c
> @@ -163,7 +163,7 @@ static int reserve_blocks(struct super_b
>  			return 0;
>  	}
>  
> -	percpu_counter_mod(&sbi->s_freeblocks_counter, -count);
> +	percpu_counter_add(&sbi->s_freeblocks_counter, -count);

Out of curiosity, I noticed similar thing being done in the vm code, what is
preferred:

	foobar_add(&counter, -num);

or

	foobar_sub(&counter, num);

?

Josef 'Jeff' Sipek.

-- 
Research, n.:
  Consider Columbus:
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