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dm: eliminate some holes data structures

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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>
This commit is contained in:
Mike Snitzer
2010-03-06 02:32:33 +00:00
committed by Alasdair G Kergon
parent 3abf85b5b5
commit 924e600d41
2 changed files with 15 additions and 15 deletions
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4
include/linux/dm-io.h
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@@ -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 {