md/raid1/raid10: add a cond_resched

During 'check' of a raid1 or raid10 it is possible for the management
thread to spend a lot of time running 'memcmp' on blocks from
different devices, so make sure the thread has a chance to schedule.
raid5d already has a cond_resched (in process_stripe).

Reported-By: Lee Howard <faxguy@howardsilvan.com>
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index d1b9bd5..71a01a2 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1683,6 +1683,7 @@ static void raid1d(mddev_t *mddev)
                                generic_make_request(bio);
                        }
                }
+               cond_resched();
        }
        if (unplug)
                unplug_slaves(mddev);

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 51c4c5c..69fc76c 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1632,6 +1632,7 @@ static void raid10d(mddev_t *mddev)
                                generic_make_request(bio);
                        }
                }
+               cond_resched();
        }
        if (unplug)
                unplug_slaves(mddev);