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| author | Milan Broz <mbroz@redhat.com> | 2008-04-24 21:42:36 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2008-04-25 13:26:35 +0100 |
| commit | 8ee2767a5903fde549fd3597690f64c8d951051a (patch) | |
| tree | d419a324e1da7323113e8b6e0063ba94ab70fa70 /drivers/md/dm-snap.c | |
| parent | 924362629bf5645aee5f49f8a0d0d5b193e65997 (diff) | |
| download | op-kernel-dev-8ee2767a5903fde549fd3597690f64c8d951051a.zip op-kernel-dev-8ee2767a5903fde549fd3597690f64c8d951051a.tar.gz | |
dm snapshot: reduce default memory allocation
Limit the amount of memory allocated per snapshot on systems
with a large page size. (The larger default chunk size on
these systems compensates for the smaller number of pages reserved.)
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-snap.c')
| -rw-r--r-- | drivers/md/dm-snap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 4dc8a43c..08047fb 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -36,9 +36,9 @@ #define SNAPSHOT_COPY_PRIORITY 2 /* - * Each snapshot reserves this many pages for io + * Reserve 1MB for each snapshot initially (with minimum of 1 page). */ -#define SNAPSHOT_PAGES 256 +#define SNAPSHOT_PAGES (((1UL << 20) >> PAGE_SHIFT) ? : 1) static struct workqueue_struct *ksnapd; static void flush_queued_bios(struct work_struct *work); |
