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| author | majianpeng <majianpeng@gmail.com> | 2012-10-31 11:59:10 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-12-13 16:41:40 +1100 |
| commit | 54f89341e8b8da0cdac8a7b873491739de19f098 (patch) | |
| tree | 360f937ada4613db9772ef1a28f9503cb4457169 | |
| parent | 35d78c66969fbbb51046e9f251849cf54e9ed88c (diff) | |
| download | op-kernel-dev-54f89341e8b8da0cdac8a7b873491739de19f098.zip op-kernel-dev-54f89341e8b8da0cdac8a7b873491739de19f098.tar.gz | |
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>
| -rw-r--r-- | drivers/md/md.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index f970834..6aefa44 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"); } |
