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authormajianpeng <majianpeng@gmail.com>2012-10-31 11:59:10 +1100
committerNeilBrown <neilb@suse.de>2012-12-13 16:41:40 +1100
commit54f89341e8b8da0cdac8a7b873491739de19f098 (patch)
tree360f937ada4613db9772ef1a28f9503cb4457169 /drivers/md
parent35d78c66969fbbb51046e9f251849cf54e9ed88c (diff)
md: Update checkpoint of resync/recovery based on time.
md will current only only checkpoint recovery or resync ever 1/16th of the device size. As devices get larger this can become a long time an so a lot of work that might need to be duplicated after a shutdown. So add a time-based checkpoint. Every 5 minutes limits the amount of duplicated effort to at most 5 minutes, and has almost zero impact on performance. [changelog entry re-written by NeilBrown] Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index f9708347647..6aefa443481 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7277,6 +7277,7 @@ EXPORT_SYMBOL_GPL(md_allow_write);
#define SYNC_MARKS 10
#define SYNC_MARK_STEP (3*HZ)
+#define UPDATE_FREQUENCY (5*60*HZ)
void md_do_sync(struct md_thread *thread)
{
struct mddev *mddev = thread->mddev;
@@ -7285,6 +7286,7 @@ void md_do_sync(struct md_thread *thread)
window;
sector_t max_sectors,j, io_sectors;
unsigned long mark[SYNC_MARKS];
+ unsigned long update_time;
sector_t mark_cnt[SYNC_MARKS];
int last_mark,m;
struct list_head *tmp;
@@ -7444,6 +7446,7 @@ void md_do_sync(struct md_thread *thread)
mddev->curr_resync_completed = j;
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
md_new_event(mddev);
+ update_time = jiffies;
blk_start_plug(&plug);
while (j < max_sectors) {
@@ -7455,6 +7458,7 @@ void md_do_sync(struct md_thread *thread)
((mddev->curr_resync > mddev->curr_resync_completed &&
(mddev->curr_resync - mddev->curr_resync_completed)
> (max_sectors >> 4)) ||
+ time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
(j - mddev->curr_resync_completed)*2
>= mddev->resync_max - mddev->curr_resync_completed
)) {
@@ -7465,6 +7469,7 @@ void md_do_sync(struct md_thread *thread)
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
j > mddev->recovery_cp)
mddev->recovery_cp = j;
+ update_time = jiffies;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
}