From: Roel Kluin <12o3l@tiscali.nl>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] block/blk-merge.c: inverted likeliness in ll_back_merge_fn()
Date: Tue, 11 Mar 2008 09:18:09 +0100 [thread overview]
Message-ID: <47D64041.7050903@tiscali.nl> (raw)
In-Reply-To: <20080311061148.GC17940@kernel.dk>
Jens Axboe wrote:
> On Tue, Mar 11 2008, Roel Kluin wrote:
>> In my likely profile it appears this one is inverted.
>
> Depends entirely on the workload, it should be removed rather than
> inverted.
>
---
Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
---
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 0f58616..7651c3b 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -305,7 +305,7 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
}
if (unlikely(!bio_flagged(req->biotail, BIO_SEG_VALID)))
blk_recount_segments(q, req->biotail);
- if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
+ if (!bio_flagged(bio, BIO_SEG_VALID))
blk_recount_segments(q, bio);
len = req->biotail->bi_hw_back_size + bio->bi_hw_front_size;
if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(req->biotail), __BVEC_START(bio))
prev parent reply other threads:[~2008-03-11 8:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-11 1:35 [PATCH] block/blk-merge.c: inverted likeliness in ll_back_merge_fn() Roel Kluin
2008-03-11 6:11 ` Jens Axboe
2008-03-11 8:18 ` Roel Kluin [this message]
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