linux-kernel - Re: [PATCH 1/3] f2fs: avoid redundant call to has_not_enough_free_secs in f2fs

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Date:	Thu, 31 Jan 2013 10:10:42 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	jaegeuk.kim@...sung.com
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH 1/3] f2fs: avoid redundant call to has_not_enough_free_secs
 in f2fs_gc

2013/1/31, Jaegeuk Kim <jaegeuk.kim@...sung.com>:
> 2013-01-30 (수), 22:47 +0900, Namjae Jeon:
>> From: Namjae Jeon <namjae.jeon@...sung.com>
>>
>> After doing a write_checkpoint from garbage collection path if there is
>> still
>> need to do more garbage collection, gc_more label is used to jump and
>> start
>> the process again. And in that process, first step before getting victim
>> is to
>> check if there are not enough free sections, which is already done before
>> doing a jump to gc_more. We can avoid the redundant call to check free
>> sections, by checking the gc_type flag which will remain FG_GC(value 1)
>> under
>> this condition.
>>
>> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
>> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
>> ---
>>  fs/f2fs/gc.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
>> index 9b5d0aa..0dfdaa5 100644
>> --- a/fs/f2fs/gc.c
>> +++ b/fs/f2fs/gc.c
>> @@ -672,7 +672,7 @@ gc_more:
>>  	if (!(sbi->sb->s_flags & MS_ACTIVE))
>>  		goto stop;
>>
>> -	if (has_not_enough_free_secs(sbi))
>> +	if (!gc_type && has_not_enough_free_secs(sbi))
>
> I applied this patch with the following change:
> 	if (gc_type == BG_GC && has_not_enough_free_secs(sbi))
>
> Thank you. :)

Right!, Thanks Jaegeuk :)
>
>>  		gc_type = FG_GC;
>>
>>  	if (!__get_victim(sbi, &segno, gc_type, NO_CHECK_TYPE))
>
> --
> Jaegeuk Kim
> Samsung
>
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