linux-kernel - Re: [f2fs-dev] [PATCH v4 2/2] f2fs: introduce periodic iostat io latency traces

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Date:   Fri, 20 Aug 2021 08:23:05 -0700
From:   Daeho Jeong <daeho43@...il.com>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v4 2/2] f2fs: introduce periodic iostat io
 latency traces

On Fri, Aug 20, 2021 at 3:50 AM Chao Yu <chao@...nel.org> wrote:
>
> On 2021/8/20 11:52, Daeho Jeong wrote:
> > +void iostat_update_and_unbind_ctx(struct bio *bio, int rw)
> > +{
> > +     struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
> > +     int sync_type = bio->bi_opf & REQ_SYNC ? 0 : 1;
>
> int sync_type = bio->bi_opf & REQ_SYNC ? 1 : 0;
>
> Right?

This means just type, not boolean number. So, I set type 0 is sync and
type 1 is async.

>
> >   int f2fs_init_iostat(struct f2fs_sb_info *sbi)
> >   {
> >       /* init iostat info */
> >       spin_lock_init(&sbi->iostat_lock);
> > +     spin_lock_init(&sbi->iostat_lat_lock);
> >       sbi->iostat_enable = false;
> >       sbi->iostat_period_ms = DEFAULT_IOSTAT_PERIOD_MS;
> > +     sbi->iostat_io_lat = f2fs_kzalloc(sbi, sizeof(struct iostat_lat_info),
> > +                                     GFP_KERNEL);
> > +     if (!sbi->iostat_io_lat)
> > +             return -ENOMEM;
>
> What do you think of just embedding iostat_io_lat structure into f2fs_sb_info
> structure? it's minor thing though.
>

I also wanted to do that, but if we embed this type, we need to define
that structure in f2fs.h file.
Is it okay with you?

> Thanks,