linux-kernel - Re: [PATCH] md: use interruptible apis in idle/frozen_sync

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Date:   Fri, 8 Sep 2023 13:29:59 -0700
From:   Song Liu <song@...nel.org>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     Li Nan <linan122@...wei.com>, linux-raid@...r.kernel.org,
        linux-kernel@...r.kernel.org, yi.zhang@...wei.com,
        houtao1@...wei.com, yangerkun@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] md: use interruptible apis in idle/frozen_sync_thread

On Wed, Sep 6, 2023 at 11:31 PM Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> 在 2023/09/06 16:44, Li Nan 写道:
> > Before refactoring idle and frozen from action_store, interruptible apis
> > is used so that hungtask warning won't be triggered if it takes too long
> > to finish indle/frozen sync_thread. So change to use interruptible apis.
> >
> LGTM
>
> Reviewed-by: Yu Kuai <yukuai3@...wei.com>
>
> > Signed-off-by: Li Nan <linan122@...wei.com>

I think we will need a fix tag and send this via md-fixes branch (to 6.6)?

Thanks,
Song



> > ---
> >   drivers/md/md.c | 13 +++++++++----
> >   1 file changed, 9 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/md/md.c b/drivers/md/md.c
> > index 46badd13a687..52689adfa37f 100644
> > --- a/drivers/md/md.c
> > +++ b/drivers/md/md.c
> > @@ -4834,11 +4834,14 @@ static void idle_sync_thread(struct mddev *mddev)
> >   {
> >       int sync_seq = atomic_read(&mddev->sync_seq);
> >
> > -     mutex_lock(&mddev->sync_mutex);
> > +     if (mutex_lock_interruptible(&mddev->sync_mutex))
> > +             return;
> > +
> >       clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
> >       stop_sync_thread(mddev);
> >
> > -     wait_event(resync_wait, sync_seq != atomic_read(&mddev->sync_seq) ||
> > +     wait_event_interruptible(resync_wait,
> > +                     sync_seq != atomic_read(&mddev->sync_seq) ||
> >                       !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));
> >
> >       mutex_unlock(&mddev->sync_mutex);
> > @@ -4846,11 +4849,13 @@ static void idle_sync_thread(struct mddev *mddev)
> >
> >   static void frozen_sync_thread(struct mddev *mddev)
> >   {
> > -     mutex_lock(&mddev->sync_mutex);
> > +     if (mutex_lock_interruptible(&mddev->sync_mutex))
> > +             return;
> > +
> >       set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
> >       stop_sync_thread(mddev);
> >
> > -     wait_event(resync_wait, mddev->sync_thread == NULL &&
> > +     wait_event_interruptible(resync_wait, mddev->sync_thread == NULL &&
> >                       !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery));
> >
> >       mutex_unlock(&mddev->sync_mutex);
> >
>