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authorMikulas Patocka <mpatocka@redhat.com>2011-05-29 13:03:11 +0100
committerAlasdair G Kergon <agk@redhat.com>2011-05-29 13:03:11 +0100
commit5f43ba2950414dc0abf4ac44c397d88069056746 (patch)
treef80df9947ef30f965d9c33e649d1856f1e47220f /drivers/md/dm-kcopyd.c
parentbda8efec5c706a672e0714d341a342e811f0262a (diff)
downloadlinux-5f43ba2950414dc0abf4ac44c397d88069056746.tar.bz2
dm kcopyd: reserve fewer pages
Reserve just the minimum of pages needed to process one job. Because we allocate pages from page allocator, we don't need to reserve a large number of pages. The maximum job size is SUB_JOB_SIZE and we calculate the number of reserved pages based on this. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-kcopyd.c')
-rw-r--r--drivers/md/dm-kcopyd.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index 719693340d1d..579647f8b4d2 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -30,6 +30,7 @@
#define SUB_JOB_SIZE 128
#define SPLIT_COUNT 8
#define MIN_JOBS 8
+#define RESERVE_PAGES (DIV_ROUND_UP(SUB_JOB_SIZE << SECTOR_SHIFT, PAGE_SIZE))
/*-----------------------------------------------------------------
* Each kcopyd client has its own little pool of preallocated
@@ -636,8 +637,7 @@ int kcopyd_cancel(struct kcopyd_job *job, int block)
/*-----------------------------------------------------------------
* Client setup
*---------------------------------------------------------------*/
-int dm_kcopyd_client_create(unsigned min_pages,
- struct dm_kcopyd_client **result)
+int dm_kcopyd_client_create(struct dm_kcopyd_client **result)
{
int r = -ENOMEM;
struct dm_kcopyd_client *kc;
@@ -663,7 +663,7 @@ int dm_kcopyd_client_create(unsigned min_pages,
kc->pages = NULL;
kc->nr_reserved_pages = kc->nr_free_pages = 0;
- r = client_reserve_pages(kc, min_pages);
+ r = client_reserve_pages(kc, RESERVE_PAGES);
if (r)
goto bad_client_pages;