diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2011-05-29 13:03:11 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-05-29 13:03:11 +0100 |
| commit | 5f43ba2950414dc0abf4ac44c397d88069056746 (patch) | |
| tree | f80df9947ef30f965d9c33e649d1856f1e47220f /drivers/md/dm-kcopyd.c | |
| parent | bda8efec5c706a672e0714d341a342e811f0262a (diff) | |
| download | linux-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.c | 6 |
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; |