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authorMike Snitzer <snitzer@redhat.com>2010-03-06 02:32:33 +0000
committerAlasdair G Kergon <agk@redhat.com>2010-03-06 02:32:33 +0000
commit924e600d417ead9ef67043988055ba236f114718 (patch)
tree338db5dfc0f8fe8f9aa39bd19639ad1f1dc27e46 /include
parent3abf85b5b5851b5f28d3d8a920ebb844edd08352 (diff)
downloadop-kernel-dev-924e600d417ead9ef67043988055ba236f114718.zip
op-kernel-dev-924e600d417ead9ef67043988055ba236f114718.tar.gz
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.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/dm-io.h b/include/linux/dm-io.h
index b6bf17e..5c9186b 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 {
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