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authorMilan Broz <mbroz@redhat.com>2008-04-24 21:42:36 +0100
committerAlasdair G Kergon <agk@redhat.com>2008-04-25 13:26:35 +0100
commit8ee2767a5903fde549fd3597690f64c8d951051a (patch)
treed419a324e1da7323113e8b6e0063ba94ab70fa70 /drivers/md/dm-snap.c
parent924362629bf5645aee5f49f8a0d0d5b193e65997 (diff)
downloadop-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.c4
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);
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