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authorMikulas Patocka <mpatocka@redhat.com>2011-05-29 16:03:09 +0400
committerAlasdair G Kergon <agk@redhat.com>2011-05-29 16:03:09 +0400
commitbda8efec5c706a672e0714d341a342e811f0262a (patch)
tree7daf7b505723f5ed2767353dc3fe53b939c46d87 /drivers/md/dm-log.c
parentd04714580f12379fcf7a0f799e86c92b96dd4e1f (diff)
downloadlinux-bda8efec5c706a672e0714d341a342e811f0262a.tar.xz
dm io: use fixed initial mempool size
Replace the arbitrary calculation of an initial io struct mempool size with a constant. The code calculated the number of reserved structures based on the request size and used a "magic" multiplication constant of 4. This patch changes it to reserve a fixed number - itself still chosen quite arbitrarily. Further testing might show if there is a better number to choose. Note that if there is no memory pressure, we can still allocate an arbitrary number of "struct io" structures. One structure is enough to process the whole request. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-log.c')
-rw-r--r--drivers/md/dm-log.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index a1f321889676..948e3f4925bf 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -449,8 +449,7 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
lc->io_req.mem.type = DM_IO_VMA;
lc->io_req.notify.fn = NULL;
- lc->io_req.client = dm_io_client_create(dm_div_up(buf_size,
- PAGE_SIZE));
+ lc->io_req.client = dm_io_client_create();
if (IS_ERR(lc->io_req.client)) {
r = PTR_ERR(lc->io_req.client);
DMWARN("couldn't allocate disk io client");