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Groups > linux.kernel > #1185991
| From | Ming Lei <ming.lei@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v7 2/6] block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop |
| Date | 2015-07-16 17:40 +0200 |
| Message-ID | <pMTqs-2pX-63@gated-at.bofh.it> (permalink) |
| References | <pMTqq-2pX-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
It doesn't make sense to enable merge because the I/O submitted to backing file is handled page by page. Signed-off-by: Ming Lei <ming.lei@canonical.com> --- drivers/block/loop.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index f7a4c9d..e4381f8 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1595,6 +1595,12 @@ static int loop_add(struct loop_device **l, int i) } lo->lo_queue->queuedata = lo; + /* + * It doesn't make sense to enable merge because the I/O + * submitted to backing file is handled page by page. + */ + queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, lo->lo_queue); + INIT_LIST_HEAD(&lo->write_cmd_head); INIT_WORK(&lo->write_work, loop_queue_write_work); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH v7 0/6] block: loop: improve loop with AIO Ming Lei <ming.lei@canonical.com> - 2015-07-16 17:40 +0200
[PATCH v7 5/6] block: loop: introduce ioctl command of LOOP_SET_DIRECT_IO Ming Lei <ming.lei@canonical.com> - 2015-07-16 17:40 +0200
[PATCH v7 4/6] block: loop: prepare for supporing direct IO Ming Lei <ming.lei@canonical.com> - 2015-07-16 17:40 +0200
[PATCH v7 2/6] block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop Ming Lei <ming.lei@canonical.com> - 2015-07-16 17:40 +0200
[PATCH v7 1/6] fs: direct-io: don't dirtying pages for ITER_BVEC/ITER_KVEC direct read Ming Lei <ming.lei@canonical.com> - 2015-07-16 17:40 +0200
Re: [PATCH v7 1/6] fs: direct-io: don't dirtying pages for ITER_BVEC/ITER_KVEC direct read Dave Kleikamp <dave.kleikamp@oracle.com> - 2015-07-16 18:50 +0200
[PATCH v7 6/6] block: loop: support DIO & AIO Ming Lei <ming.lei@canonical.com> - 2015-07-16 17:40 +0200
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