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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 /include/linux/dm-io.h
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 'include/linux/dm-io.h')
-rw-r--r--include/linux/dm-io.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/dm-io.h b/include/linux/dm-io.h
index 5c9186b93fff..f4b0aa3126f5 100644
--- a/include/linux/dm-io.h
+++ b/include/linux/dm-io.h
@@ -69,8 +69,7 @@ struct dm_io_request {
*
* Create/destroy may block.
*/
-struct dm_io_client *dm_io_client_create(unsigned num_pages);
-int dm_io_client_resize(unsigned num_pages, struct dm_io_client *client);
+struct dm_io_client *dm_io_client_create(void);
void dm_io_client_destroy(struct dm_io_client *client);
/*