linux-kernel - Re: [RFC 8/9] ext4: Convert ext4_fc_track_dentry type events to use event class

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Message-ID: <CAD+ocby2Z7AS+5x_AKswpzeSezpoQBp9DHLu+n9jR5P7ZRBWWg@mail.gmail.com>
Date:   Sun, 27 Feb 2022 10:35:31 -0800
From:   harshad shirwadkar <harshadshirwadkar@...il.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Ritesh Harjani <riteshh@...ux.ibm.com>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        "Theodore Ts'o" <tytso@....edu>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC 8/9] ext4: Convert ext4_fc_track_dentry type events to use
 event class

Nice! Thanks for fixing this.

Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>


- Harshad

On Wed, 23 Feb 2022 at 01:49, Jan Kara <jack@...e.cz> wrote:
>
> On Wed 23-02-22 02:04:16, Ritesh Harjani wrote:
> > One should use DECLARE_EVENT_CLASS for similar event types instead of
> > defining TRACE_EVENT for each event type. This is helpful in reducing
> > the text section footprint for e.g. [1]
> >
> > [1]: https://lwn.net/Articles/381064/
> >
> > Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>
>
> Looks good. Feel free to add:
>
> Reviewed-by: Jan Kara <jack@...e.cz>
>
>                                                                 Honza
>
> > ---
> >  include/trace/events/ext4.h | 57 +++++++++++++++++++++----------------
> >  1 file changed, 32 insertions(+), 25 deletions(-)
> >
> > diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
> > index 233dbffa5ceb..33a059d845d6 100644
> > --- a/include/trace/events/ext4.h
> > +++ b/include/trace/events/ext4.h
> > @@ -2783,33 +2783,40 @@ TRACE_EVENT(ext4_fc_stats,
> >                 __entry->fc_numblks)
> >  );
> >
> > -#define DEFINE_TRACE_DENTRY_EVENT(__type)                            \
> > -     TRACE_EVENT(ext4_fc_track_##__type,                             \
> > -         TP_PROTO(struct inode *inode, struct dentry *dentry, int ret), \
> > -                                                                     \
> > -         TP_ARGS(inode, dentry, ret),                                \
> > -                                                                     \
> > -         TP_STRUCT__entry(                                           \
> > -                 __field(dev_t, dev)                                 \
> > -                 __field(int, ino)                                   \
> > -                 __field(int, error)                                 \
> > -                 ),                                                  \
> > -                                                                     \
> > -         TP_fast_assign(                                             \
> > -                 __entry->dev = inode->i_sb->s_dev;                  \
> > -                 __entry->ino = inode->i_ino;                        \
> > -                 __entry->error = ret;                               \
> > -                 ),                                                  \
> > -                                                                     \
> > -         TP_printk("dev %d:%d, inode %d, error %d, fc_%s",           \
> > -                   MAJOR(__entry->dev), MINOR(__entry->dev),         \
> > -                   __entry->ino, __entry->error,                     \
> > -                   #__type)                                          \
> > +DECLARE_EVENT_CLASS(ext4_fc_track_dentry,
> > +
> > +     TP_PROTO(struct inode *inode, struct dentry *dentry, int ret),
> > +
> > +     TP_ARGS(inode, dentry, ret),
> > +
> > +     TP_STRUCT__entry(
> > +             __field(dev_t, dev)
> > +             __field(int, ino)
> > +             __field(int, error)
> > +     ),
> > +
> > +     TP_fast_assign(
> > +             __entry->dev = inode->i_sb->s_dev;
> > +             __entry->ino = inode->i_ino;
> > +             __entry->error = ret;
> > +     ),
> > +
> > +     TP_printk("dev %d,%d, inode %d, error %d",
> > +               MAJOR(__entry->dev), MINOR(__entry->dev),
> > +               __entry->ino, __entry->error
> >       )
> > +);
> > +
> > +#define DEFINE_EVENT_CLASS_TYPE(__type)                                      \
> > +DEFINE_EVENT(ext4_fc_track_dentry, ext4_fc_track_##__type,           \
> > +     TP_PROTO(struct inode *inode, struct dentry *dentry, int ret),  \
> > +     TP_ARGS(inode, dentry, ret)                                     \
> > +)
> > +
> >
> > -DEFINE_TRACE_DENTRY_EVENT(create);
> > -DEFINE_TRACE_DENTRY_EVENT(link);
> > -DEFINE_TRACE_DENTRY_EVENT(unlink);
> > +DEFINE_EVENT_CLASS_TYPE(create);
> > +DEFINE_EVENT_CLASS_TYPE(link);
> > +DEFINE_EVENT_CLASS_TYPE(unlink);
> >
> >  TRACE_EVENT(ext4_fc_track_inode,
> >           TP_PROTO(struct inode *inode, int ret),
> > --
> > 2.31.1
> >
> --
> Jan Kara <jack@...e.com>
> SUSE Labs, CR