linux-kernel - Re: [PATCH 2/2] f2fs: add REQ_META about metadata requests for submit bio

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Message-ID: <CAKYAXd_VCEdN-qfu4-yZk847hYbBi=5dtGFKYGPYJDRQ0PAkKQ@mail.gmail.com>
Date:	Mon, 22 Apr 2013 12:39:09 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	jaegeuk.kim@...sung.com
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH 2/2] f2fs: add REQ_META about metadata requests for submit bio

2013/4/22, Jaegeuk Kim <jaegeuk.kim@...sung.com>:
> 2013-04-20 (토), 01:27 +0900, Namjae Jeon:
>> From: Namjae Jeon <namjae.jeon@...sung.com>
>>
>> Adding REQ_META for all the metadata requests can help in improving the
>> FS performance, if the underlying device supports TAGGING.
>> So, when considering the submit_bio path for all the f2fs requests. We
>> can
>> add REQ_META for all the META requests.
>> As a precursor to this change we considered the commit
>> 4265900e0be653f5b78baf2816857ef57cf1332f 'mmc: MMC-4.5 Data Tag Support'
>>
>> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
>> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
>> ---
>>  fs/f2fs/segment.c |    3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>> index 1193a26..a2e5de7 100644
>> --- a/fs/f2fs/segment.c
>> +++ b/fs/f2fs/segment.c
>> @@ -689,6 +689,9 @@ static void do_submit_bio(struct f2fs_sb_info *sbi,
>>  	if (type >= META_FLUSH)
>>  		rw = WRITE_FLUSH_FUA;
>>
>> +	if (type == META)
>
> Should be if (btype == META).
> Thanks,
Yes, Right :)
Thanks for fixing.
>
>> +		rw |= REQ_META;
>> +
>>  	if (sbi->bio[btype]) {
>>  		struct bio_private *p = sbi->bio[btype]->bi_private;
>>  		trace_f2fs_do_submit_bio(sbi->sb, btype, sync,
>
> --
> Jaegeuk Kim
> Samsung
>
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