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[PATCH] blktrace: only add a bounce trace when we really bounce

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Currently we issue a bounce trace when __blk_queue_bounce() is called,
but that merely means that the device has a lower dma mask than the
higher pages in the system. The bio itself may still be lower pages. So
move the bounce trace into __blk_queue_bounce(), when we know there will
actually be page bouncing.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jens Axboe 2007-01-12 12:20:26 +01:00 committed by Linus Torvalds
parent d39c9400ae
commit c43a5082a6
1 changed files with 2 additions and 2 deletions
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4
mm/bounce.c
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@ -237,6 +237,8 @@ static void __blk_queue_bounce(request_queue_t *q, struct bio **bio_orig,
if (!bio)
return;
blk_add_trace_bio(q, *bio_orig, BLK_TA_BOUNCE);
/*
* at least one page was bounced, fill in possible non-highmem
* pages
@ -291,8 +293,6 @@ void blk_queue_bounce(request_queue_t *q, struct bio **bio_orig)
pool = isa_page_pool;
}
blk_add_trace_bio(q, *bio_orig, BLK_TA_BOUNCE);
/*
* slow path
*/