linux-kernel - Re: [PATCH 0/5] Improvements to incremental builds

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Date:   Tue, 13 Dec 2022 13:31:43 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Nicolas Schier <nicolas@...sle.eu>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org, llvm@...ts.linux.dev,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 0/5] Improvements to incremental builds

On Mon, Dec 12, 2022 at 12:31 PM Nicolas Schier <nicolas@...sle.eu> wrote:
>
> On Thu, Dec 01, 2022 at 08:57:38PM -0800 Ian Rogers wrote:
> > Switching to using install_headers caused incremental builds to always
> > rebuild most targets. This was caused by the headers always being
> > reinstalled and then getting new timestamps causing dependencies to be
> > rebuilt. Follow the convention in libbpf where the install targets are
> > separated and trigger when the target isn't present or is out-of-date.
> >
> > Further, fix an issue in the perf build with libpython where
> > python/perf.so was also regenerated as the target name was incorrect.
> >
> > Ian Rogers (5):
> >   tools lib api: Add dependency test to install_headers
> >   tools lib perf: Add dependency test to install_headers
> >   tools lib subcmd: Add dependency test to install_headers
> >   tools lib symbol: Add dependency test to install_headers
> >   perf build: Fix python/perf.so library's name
> >
> >  tools/lib/api/Makefile     | 38 ++++++++++++++++++++++-----------
> >  tools/lib/perf/Makefile    | 43 +++++++++++++++++++-------------------
> >  tools/lib/subcmd/Makefile  | 23 +++++++++++---------
> >  tools/lib/symbol/Makefile  | 21 ++++++++++++-------
> >  tools/perf/Makefile.config |  4 +++-
> >  tools/perf/Makefile.perf   |  2 +-
> >  6 files changed, 79 insertions(+), 52 deletions(-)
> >
> > --
> > 2.39.0.rc0.267.gcb52ba06e7-goog
>
> Hi Ian,
>
> which tree is your patch set based on?  At least it doesn't apply on the
> current kbuild trees.
>
> Kind regards,
> Nicolas

Hi Nicolas,

for the perf tool the branch to follow is Arnaldo's perf/core one:
https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/?h=perf%2Fcore

I may have done this work on Arnaldo's tmp.perf/core branch, which is
used for work-in-progress merges.

Thanks,
Ian

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