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| author | Mike Snitzer <snitzer@redhat.com> | 2010-03-06 02:32:33 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2010-03-06 02:32:33 +0000 |
| commit | 924e600d417ead9ef67043988055ba236f114718 (patch) | |
| tree | 338db5dfc0f8fe8f9aa39bd19639ad1f1dc27e46 /include | |
| parent | 3abf85b5b5851b5f28d3d8a920ebb844edd08352 (diff) | |
| download | blackbird-op-linux-924e600d417ead9ef67043988055ba236f114718.tar.gz blackbird-op-linux-924e600d417ead9ef67043988055ba236f114718.zip | |
dm: eliminate some holes data structures
Eliminate a 4-byte hole in 'struct dm_io_memory' by moving 'offset' above the
'ptr' to which it applies (size reduced from 24 to 16 bytes). And by
association, 1-4 byte hole is eliminated in 'struct dm_io_request' (size
reduced from 56 to 48 bytes).
Eliminate all 6 4-byte holes and 1 cache-line in 'struct dm_snapshot' (size
reduced from 392 to 368 bytes).
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dm-io.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/dm-io.h b/include/linux/dm-io.h index b6bf17ee2f61..5c9186b93fff 100644 --- a/include/linux/dm-io.h +++ b/include/linux/dm-io.h @@ -37,14 +37,14 @@ enum dm_io_mem_type { struct dm_io_memory { enum dm_io_mem_type type; + unsigned offset; + union { struct page_list *pl; struct bio_vec *bvec; void *vma; void *addr; } ptr; - - unsigned offset; }; struct dm_io_notify { |
