linux-kernel - Re: [PATCH] perf: Avoid resolving [kernel.kallsyms] to real path for buildid cache

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Date:	Wed, 9 Mar 2011 22:38:52 +0800
From:	Lin Ming <minggr@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Lin Ming <ming.m.lin@...el.com>
Cc:	Han Pingtian <phan@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf: Avoid resolving [kernel.kallsyms] to real path for
 buildid cache

Hi, Arnaldo

Could you have a look at this patch?

Thanks,
Lin Ming

On Thu, Mar 3, 2011 at 11:23 PM, Lin Ming <ming.m.lin@...el.com> wrote:
> kallsyms has a virtual file name [kernel.kallsyms].
> Currently, it can't be added to buildid cache successfully
> because the code(build_id_cache__add_s) tries to resolve
> [kernel.kallsyms]to a real absolute pathname and that fails.
>
> Fixes it by not resolving it and just use the name [kernel.kallsyms].
> So dir ~/.debug/[kernel.kallsyms] is created.
>
> Original bug report at:
> https://lkml.org/lkml/2011/3/1/524
>
> Tested-by: Han Pingtian <phan@...hat.com>
> Signed-off-by: Lin Ming <ming.m.lin@...el.com>
> ---
>  tools/perf/util/header.c |   11 ++++++++---
>  1 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 72c124d..1f8883b 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -271,11 +271,15 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
>                          const char *name, bool is_kallsyms)
>  {
>        const size_t size = PATH_MAX;
> -       char *realname = realpath(name, NULL),
> -            *filename = malloc(size),
> +       char *realname, *filename = malloc(size),
>             *linkname = malloc(size), *targetname;
>        int len, err = -1;
>
> +       if (is_kallsyms)
> +               realname = (char *)name;
> +       else
> +               realname = realpath(name, NULL);
> +
>        if (realname == NULL || filename == NULL || linkname == NULL)
>                goto out_free;
>
> @@ -307,7 +311,8 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
>        if (symlink(targetname, linkname) == 0)
>                err = 0;
>  out_free:
> -       free(realname);
> +       if (!is_kallsyms)
> +               free(realname);
>        free(filename);
>        free(linkname);
>        return err;
> --
> 1.7.2.3
>
> --
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