linux-ext4 - Re: [PATCH] ext4: remove unnecessary operation in ext4_mb_normalize_group

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Date:	Fri, 26 Mar 2010 21:44:33 +0800
From:	jing zhang <zj.barak@...il.com>
To:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>,
	"Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger@....com>,
	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Subject: Re: [PATCH] ext4: remove unnecessary operation in 
	ext4_mb_normalize_group_request()

2010/3/26, Aneesh Kumar K. V <aneesh.kumar@...ux.vnet.ibm.com>:
> On Thu, 25 Mar 2010 22:54:21 +0800, jing zhang <zj.barak@...il.com> wrote:
>> From: Jing Zhang <zj.barak@...il.com>
>>
>> Date: Wed Mar 25  22:55:04   2010
>>
>> Checking bug seems not at right place, and the function itself should
>> be inlined.
>>
>> Cc: Theodore Ts'o <tytso@....edu>
>> Cc: Andreas Dilger <adilger@....com>
>> Cc: Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
>> Cc: "Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
>> Signed-off-by: Jing Zhang <zj.barak@...il.com>
>>
>> ---
>>
>> --- linux-2.6.32/fs/ext4/mballoc.c	2009-12-03 11:51:22.000000000 +0800
>> +++ ext4_mm_leak/mballoc-10.c	2010-03-25 22:44:00.000000000 +0800
>> @@ -2786,9 +2786,7 @@ out_err:
>>  static void ext4_mb_normalize_group_request(struct
>> ext4_allocation_context *ac)
>>  {
>>  	struct super_block *sb = ac->ac_sb;
>> -	struct ext4_locality_group *lg = ac->ac_lg;
>>
>> -	BUG_ON(lg == NULL);
>>  	if (EXT4_SB(sb)->s_stripe)
>>  		ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_stripe;
>>  	else
>
> That BUG_ON is to ensure that the allocation context is actually having
> a locality group which is needed for group allocation request.
>
> -aneesh
>

Please check
1, the 3 lines at the end of ext4_mb_group_or_file()
2, the function name of this patch

              - zj
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