linux-kernel - Re: [PATCHv6 0/4] perf: Add mmap2 build id support

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Date:   Wed, 13 Jan 2021 19:26:44 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCHv6 0/4] perf: Add mmap2 build id support

On Tue, Jan 12, 2021 at 1:19 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Mon, Jan 11, 2021 at 06:49:58PM -0800, Alexei Starovoitov wrote:
> > On Mon, Jan 11, 2021 at 10:38:19PM +0100, Jiri Olsa wrote:
> > > hi,
> > > adding the support to have buildid stored in mmap2 event,
> > > so we can bypass the final perf record hunt on build ids.
> > >
> > > This patchset allows perf to record build ID in mmap2 event,
> > > and adds perf tooling to store/download binaries to .debug
> > > cache based on these build IDs.
> > >
> > > Note that the build id retrieval code is stolen from bpf
> > > code, where it's been used (together with file offsets)
> > > to replace IPs in user space stack traces. It's now added
> > > under lib directory.
> > >
> > > v6 changes:
> > >   - last 4 patches rebased Arnaldo's perf/core
> >
> > There were no issues with v5 as far as I can remember.
> > This is just a resubmit to get it landed ?
>
> yes, exactly
>
> > Last time we couldn't quite figure out which tree to go through.
> > I think the recommend path was to go via bpf-next.
> > Is it still the case?
>
> bpf-next would be best for kernel changes,
>   perf: Add build id data in mmap2 event
>   bpf: Add size arg to build_id_parse function
>   bpf: Move stack_map_get_build_id into lib

Then please cc them to bpf@...r and add [PATCH bpf-next]
otherwise it's all very confusing.

> the 'perf buildid-cache' change needs to go through Arnaldo's tree,
> because it depends on changes he already pulled in

Also don't include the 4th patch in the series if it isn't meant for bpf-next.