linux-kernel - Re: [PATCHv7 1/1] block: introduce content activity based ioprio

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Message-ID: <CAGWkznF2EeLFyKqDP1EMgKz333TyS-pA8+9-KdDLTuZyD1C==w@mail.gmail.com>
Date: Mon, 5 Feb 2024 15:13:15 +0800
From: Zhaoyang Huang <huangzhaoyang@...il.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: "zhaoyang.huang" <zhaoyang.huang@...soc.com>, Jens Axboe <axboe@...nel.dk>, 
	Yu Zhao <yuzhao@...gle.com>, linux-block@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	steve.kang@...soc.com
Subject: Re: [PATCHv7 1/1] block: introduce content activity based ioprio

On Mon, Feb 5, 2024 at 3:08 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Mon, Feb 05, 2024 at 01:57:05PM +0800, zhaoyang.huang wrote:
> > +/*
> > + * bio_set_active_ioprio() is helper function for fs to adjust the bio's ioprio via
> > + * calculating the content's activity which measured from MGLRU.
> > + * The file system should call this function before submit_bio for the buffered
> > + * read/write/sync.
> > + */
> > +#ifdef CONFIG_BLK_CONT_ACT_BASED_IOPRIO
> > +void bio_set_active_ioprio(struct bio *bio)
> > +{
> > +     struct bio_vec bv;
> > +     struct bvec_iter iter;
> > +     struct page *page;
> > +     int class, level, hint;
> > +     int activity = 0;
> > +     int cnt = 0;
> > +
> > +     class = IOPRIO_PRIO_CLASS(bio->bi_ioprio);
> > +     level = IOPRIO_PRIO_LEVEL(bio->bi_ioprio);
> > +     hint = IOPRIO_PRIO_HINT(bio->bi_ioprio);
> > +     /*apply legacy ioprio policy on RT task*/
> > +     if (task_is_realtime(current)) {
> > +             bio->bi_ioprio = IOPRIO_PRIO_VALUE_HINT(IOPRIO_CLASS_RT, level, hint);
> > +             return;
> > +     }
> > +     bio_for_each_bvec(bv, bio, iter) {
> > +             page = bv.bv_page;
>
> I gave you the prototype:
>
> : No, stop this.  What the filesystem needs to do is not
> : s/bio_add_folio/act_bio_add_folio/.  There needs to be an API to set the
> : bio prio; something like:
> :
> :         bio_set_active_prio(bio, folio);
>
> Do not iterate over the bio.  Use the folio provided to set the prio.
ok. I should miss the above information. I will update them in the next version
>
> Or is there some reason this doesn't work?