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raid5-cache: suspend reclaim thread instead of shutdown 

There is mechanism to suspend a kernel thread. Use it instead of playing
create/destroy game.

Signed-off-by: Shaohua Li <shli@fb.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Cc: Song Liu <songliubraving@fb.com>
This commit is contained in:
Shaohua Li 2016-11-21 10:29:18 -08:00
parent 1919cbb23b
commit ce1ccd079f
2 changed files with 8 additions and 14 deletions
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4
drivers/md/md.c
View File

@ -7187,10 +7187,12 @@ static int md_thread(void *arg)
wait_event_interruptible_timeout
(thread->wqueue,
test_bit(THREAD_WAKEUP, &thread->flags)
|| kthread_should_stop(),
|| kthread_should_stop() || kthread_should_park(),
thread->timeout);
clear_bit(THREAD_WAKEUP, &thread->flags);
if (kthread_should_park())
kthread_parkme();
if (!kthread_should_stop())
thread->run(thread);
}

18
drivers/md/raid5-cache.c
View File

@ -19,6 +19,7 @@
#include <linux/raid/md_p.h>
#include <linux/crc32c.h>
#include <linux/random.h>
#include <linux/kthread.h>
#include "md.h"
#include "raid5.h"
#include "bitmap.h"
@ -1437,23 +1438,14 @@ void r5l_quiesce(struct r5l_log *log, int state)
struct mddev *mddev;
if (!log || state == 2)
return;
if (state == 0) {
/*
* This is a special case for hotadd. In suspend, the array has
* no journal. In resume, journal is initialized as well as the
* reclaim thread.
*/
if (log->reclaim_thread)
return;
log->reclaim_thread = md_register_thread(r5l_reclaim_thread,
log->rdev->mddev, "reclaim");
log->reclaim_thread->timeout = R5C_RECLAIM_WAKEUP_INTERVAL;
} else if (state == 1) {
if (state == 0)
kthread_unpark(log->reclaim_thread->tsk);
else if (state == 1) {
/* make sure r5l_write_super_and_discard_space exits */
mddev = log->rdev->mddev;
wake_up(&mddev->sb_wait);
kthread_park(log->reclaim_thread->tsk);
r5l_wake_reclaim(log, MaxSector);
md_unregister_thread(&log->reclaim_thread);
r5l_do_reclaim(log);
}
}