linux-kernel - Re: [PATCH V3 07/12] perf mmap: discard legacy interface for mmap read

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Date:   Fri, 12 Jan 2018 11:52:49 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     "Liang, Kan" <kan.liang@...el.com>
Cc:     "acme@...nel.org" <acme@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "wangnan0@...wei.com" <wangnan0@...wei.com>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "yao.jin@...ux.intel.com" <yao.jin@...ux.intel.com>
Subject: Re: [PATCH V3 07/12] perf mmap: discard legacy interface for mmap
 read

On Thu, Jan 11, 2018 at 09:28:07PM +0000, Liang, Kan wrote:
> > On Thu, Dec 21, 2017 at 10:08:49AM -0800, kan.liang@...el.com wrote:
> > > From: Kan Liang <kan.liang@...el.com>
> > >
> > > Discards perf_mmap__read_backward and perf_mmap__read_catchup.
> > No tools
> > > use them.
> > >
> > > There are tools still use perf_mmap__read_forward. Keep it, but add
> > > comments to point to the new interface for future use.
> > >
> > > Signed-off-by: Kan Liang <kan.liang@...el.com>
> > > ---
> > >  tools/perf/util/mmap.c | 50 ++++----------------------------------------------
> > >  tools/perf/util/mmap.h |  3 ---
> > >  2 files changed, 4 insertions(+), 49 deletions(-)
> > >
> > > diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
> > > index d0ca3ba..650e0a7 100644
> > > --- a/tools/perf/util/mmap.c
> > > +++ b/tools/perf/util/mmap.c
> > > @@ -63,6 +63,10 @@ static union perf_event *perf_mmap__read(struct
> > perf_mmap *map,
> > >  	return event;
> > >  }
> > >
> > > +/*
> > > + * legacy interface for mmap read.
> > > + * Don't use it. Use perf_mmap__read_event().
> > > + */
> > 
> > could we get rid of it then? looks like it's not much work,
> > seems it's used only in:
> >
> 
> To get rid of it, it has to introduce the whole 
> perf_mmap__read_init/_read_event/_done.
> 
> Besides perf top, kvm and trace need to be changed.
> There are also 11 perf test cases need to be changed as well.
> 
> I think that would make current patch series too huge.
> I can submit a separated patch series later to get rid of
> the legacy interface. Is it OK?

ok

jirka