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Message-ID: <20200914160434.GH160517@kernel.org>
Date: Mon, 14 Sep 2020 13:04:34 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Olsa <jolsa@...nel.org>
Cc: 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>,
"Frank Ch. Eigler" <fche@...hat.com>,
Ian Rogers <irogers@...gle.com>,
Stephane Eranian <eranian@...gle.com>,
Alexey Budankov <alexey.budankov@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>,
Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 06/26] perf tools: Add support to read build id from
compressed elf
Em Sun, Sep 13, 2020 at 11:02:53PM +0200, Jiri Olsa escreveu:
> Adding support to decompress file before reading build id.
>
> Adding filename__read_build_id and change its current
> versions to read_build_id.
Also a standalone, generally useful, prep patch, applyed.
- Arnaldo
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
> tools/perf/util/symbol-elf.c | 37 ++++++++++++++++++++++++++++++++++--
> 1 file changed, 35 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
> index 94a156df22d5..6770572620f3 100644
> --- a/tools/perf/util/symbol-elf.c
> +++ b/tools/perf/util/symbol-elf.c
> @@ -534,7 +534,7 @@ static int elf_read_build_id(Elf *elf, void *bf, size_t size)
>
> #ifdef HAVE_LIBBFD_BUILDID_SUPPORT
>
> -int filename__read_build_id(const char *filename, void *bf, size_t size)
> +static int read_build_id(const char *filename, void *bf, size_t size)
> {
> int err = -1;
> bfd *abfd;
> @@ -562,7 +562,7 @@ int filename__read_build_id(const char *filename, void *bf, size_t size)
>
> #else // HAVE_LIBBFD_BUILDID_SUPPORT
>
> -int filename__read_build_id(const char *filename, void *bf, size_t size)
> +static int read_build_id(const char *filename, void *bf, size_t size)
> {
> int fd, err = -1;
> Elf *elf;
> @@ -591,6 +591,39 @@ int filename__read_build_id(const char *filename, void *bf, size_t size)
>
> #endif // HAVE_LIBBFD_BUILDID_SUPPORT
>
> +int filename__read_build_id(const char *filename, void *bf, size_t size)
> +{
> + struct kmod_path m = { .name = NULL, };
> + char path[PATH_MAX];
> + int err;
> +
> + if (!filename)
> + return -EFAULT;
> +
> + err = kmod_path__parse(&m, filename);
> + if (err)
> + return -1;
> +
> + if (m.comp) {
> + int error = 0, fd;
> +
> + fd = filename__decompress(filename, path, sizeof(path), m.comp, &error);
> + if (fd < 0) {
> + pr_debug("Failed to decompress (error %d) %s\n",
> + error, filename);
> + return -1;
> + }
> + close(fd);
> + filename = path;
> + }
> +
> + err = read_build_id(filename, bf, size);
> +
> + if (m.comp)
> + unlink(filename);
> + return err;
> +}
> +
> int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
> {
> int fd, err = -1;
> --
> 2.26.2
>
--
- Arnaldo
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