linux-kernel - Re: [PATCH v2 1/2] blk-wbt: Fix some comments

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Message-ID: <CAOB9oOYvSOeTTvF9nsWH4Fbqx0DKSG0kh8m5Fc0XYoKnPBBpYA@mail.gmail.com>
Date: Tue, 25 Feb 2025 20:38:13 +0800
From: Yizhou Tang <tangyeechou@...il.com>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: Tang Yizhou <yizhou.tang@...pee.com>, axboe@...nel.dk, linux-block@...r.kernel.org, 
	linux-kernel@...r.kernel.org, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH v2 1/2] blk-wbt: Fix some comments

On Thu, Feb 13, 2025 at 7:06 PM Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> Hi,
>
> 在 2025/02/13 18:06, Tang Yizhou 写道:
> > From: Tang Yizhou <yizhou.tang@...pee.com>
> >
> > wbt_wait() no longer uses a spinlock as a parameter. Update the function
> > comments accordingly.
> >
> > RWB_UNKNOWN_BUMP is used when we gradually adjust scale_steps toward the
> > center state, which is a value of 0.
> >
> > Signed-off-by: Tang Yizhou <yizhou.tang@...pee.com>
> > ---
> >   block/blk-wbt.c | 11 ++++-------
> >   1 file changed, 4 insertions(+), 7 deletions(-)
> >
>
> LGTM
> Reviewed-by: Yu Kuai <yukuai3@...wei.com>

Hi Jens, could you kindly review and consider merging this patch?

Yi.

>
> > diff --git a/block/blk-wbt.c b/block/blk-wbt.c
> > index 6dfc659d22e2..8b73c0c11aec 100644
> > --- a/block/blk-wbt.c
> > +++ b/block/blk-wbt.c
> > @@ -136,8 +136,9 @@ enum {
> >       RWB_MIN_WRITE_SAMPLES   = 3,
> >
> >       /*
> > -      * If we have this number of consecutive windows with not enough
> > -      * information to scale up or down, scale up.
> > +      * If we have this number of consecutive windows without enough
> > +      * information to scale up or down, slowly return to center state
> > +      * (step == 0).
> >        */
> >       RWB_UNKNOWN_BUMP        = 5,
> >   };
> > @@ -638,11 +639,7 @@ static void wbt_cleanup(struct rq_qos *rqos, struct bio *bio)
> >       __wbt_done(rqos, flags);
> >   }
> >
> > -/*
> > - * May sleep, if we have exceeded the writeback limits. Caller can pass
> > - * in an irq held spinlock, if it holds one when calling this function.
> > - * If we do sleep, we'll release and re-grab it.
> > - */
> > +/* May sleep, if we have exceeded the writeback limits. */
> >   static void wbt_wait(struct rq_qos *rqos, struct bio *bio)
> >   {
> >       struct rq_wb *rwb = RQWB(rqos);
> >
>
>