md: allow parallel resync of md-devices.

In some configurations, a raid6 resync can be limited by CPU speed
(Calculating P and Q and moving data) rather than by device speed.  In
these cases there is nothing to be gained byt serialising resync of arrays
that share a device, and doing the resync in parallel can provide benefit.
 So add a sysfs tunable to flag an array as being allowed to resync in
parallel with other arrays that use (a different part of) the same device.

Signed-off-by: Bernd Schubert <bs@q-leap.de>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index e57213d..295be1a 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -74,6 +74,8 @@ static DEFINE_SPINLOCK(pers_lock);
 
 static void md_print_devices(void);
 
+static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
+
 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
 
 /*
@@ -3013,6 +3015,36 @@ degraded_show(mddev_t *mddev, char *page)
 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
 
 static ssize_t
+sync_force_parallel_show(mddev_t *mddev, char *page)
+{
+       return sprintf(page, "%d\n", mddev->parallel_resync);
+}
+
+static ssize_t
+sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
+{
+       long n;
+
+       if (strict_strtol(buf, 10, &n))
+               return -EINVAL;
+
+       if (n != 0 && n != 1)
+               return -EINVAL;
+
+       mddev->parallel_resync = n;
+
+       if (mddev->sync_thread)
+               wake_up(&resync_wait);
+
+       return len;
+}
+
+/* force parallel resync, even with shared block devices */
+static struct md_sysfs_entry md_sync_force_parallel =
+__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
+       sync_force_parallel_show, sync_force_parallel_store);
+
+static ssize_t
 sync_speed_show(mddev_t *mddev, char *page)
 {
        unsigned long resync, dt, db;
@@ -3187,6 +3219,7 @@ static struct attribute *md_redundancy_attrs[] = {
        &md_sync_min.attr,
        &md_sync_max.attr,
        &md_sync_speed.attr,
+       &md_sync_force_parallel.attr,
        &md_sync_completed.attr,
        &md_max_sync.attr,
        &md_suspend_lo.attr,
@@ -5487,8 +5520,6 @@ void md_allow_write(mddev_t *mddev)
 }
 EXPORT_SYMBOL_GPL(md_allow_write);
 
-static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
-
 #define SYNC_MARKS     10
 #define        SYNC_MARK_STEP  (3*HZ)
 void md_do_sync(mddev_t *mddev)
@@ -5552,8 +5583,9 @@ void md_do_sync(mddev_t *mddev)
                for_each_mddev(mddev2, tmp) {
                        if (mddev2 == mddev)
                                continue;
-                       if (mddev2->curr_resync && 
-                           match_mddev_units(mddev,mddev2)) {
+                       if (!mddev->parallel_resync
+                       &&  mddev2->curr_resync
+                       &&  match_mddev_units(mddev, mddev2)) {
                                DEFINE_WAIT(wq);
                                if (mddev < mddev2 && mddev->curr_resync == 2) {
                                        /* arbitrarily yield */

diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 812ffa5..a6d7ab6 100644 (file)
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -180,6 +180,9 @@ struct mddev_s
        int                             sync_speed_min;
        int                             sync_speed_max;
 
+       /* resync even though the same disks are shared among md-devices */
+       int                             parallel_resync;
+
        int                             ok_start_degraded;
        /* recovery/resync flags 
         * NEEDED:   we might need to start a resync/recover