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| author | Kiyoshi Ueda <k-ueda@ct.jp.nec.com> | 2009-01-06 03:05:07 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-01-06 03:05:07 +0000 |
| commit | 7d76345da6ed3927c9cbf5d3f7a7021e8bba7374 (patch) | |
| tree | d0b470dd1a55dfffb27ffa012e4a5afebd133495 /net/ipv4/tcp_output.c | |
| parent | 8fbf26ad5b16ad3a826ca7fe3e86700420abed1f (diff) | |
dm request: extend target interface
This patch adds the following target interfaces for request-based dm.
map_rq : for mapping a request
rq_end_io : for finishing a request
busy : for avoiding performance regression from bio-based dm.
Target can tell dm core not to map requests now, and
that may help requests in the block layer queue to be
bigger by I/O merging.
In bio-based dm, this behavior is done by device
drivers managing the block layer queue.
But in request-based dm, dm core has to do that
since dm core manages the block layer queue.
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'net/ipv4/tcp_output.c')
0 files changed, 0 insertions, 0 deletions