在 2016/11/16 下午10:19, Coly Li 写道:
[snip]
> ---
> drivers/md/raid1.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> Index: linux-raid1/drivers/md/raid1.c
> ===================================================================
> --- linux-raid1.orig/drivers/md/raid1.c
> +++ linux-raid1/drivers/md/raid1.c
> @@ -2387,17 +2387,17 @@ static void raid1d(struct md_thread *thr
[snip]
> while (!list_empty(&tmp)) {
> r1_bio = list_first_entry(&tmp, struct r1bio,
> retry_list);
> list_del(&r1_bio->retry_list);
> + spin_lock_irqsave(&conf->device_lock, flags);
> + conf->nr_queued--;
> + spin_unlock_irqrestore(&conf->device_lock, flags);
[snip]
Now I work on another 2 patches for a simpler I/O barrier, and a
lockless I/O submit on raid1, where conf->nr_queued will be in atomic_t.
So spin lock expense will not exist any more. Just FYI.
Coly
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