linux-kernel - Re: [PATCH] perf tools: Adjust symbols in VDSO

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Date:	Thu, 17 Apr 2014 11:46:42 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Vladimir Nikulichev <nvs@...icks.com>, Jiri Olsa <jolsa@...hat.com>
CC:	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf tools: Adjust symbols in VDSO

On 04/11/2014 05:25 PM, Vladimir Nikulichev wrote:
> perf tools: Adjust symbols in VDSO
> 
> pert-report doesn't resolve function names in VDSO:
> 
> $ perf report --stdio -g flat,0.0,15,callee --sort pid
> ...
>             8.76%
>                0x7fff6b1fe861
>                __gettimeofday
>                ACE_OS::gettimeofday()
> ...
> 
> In this case symbol values should be adjusted the same way as for executables,
> relocatable objects and prelinked libraries.
> 
> After fix:
> 
> $ perf report --stdio -g flat,0.0,15,callee --sort pid
> ...
>             8.76%
>                __vdso_gettimeofday
>                __gettimeofday
>                ACE_OS::gettimeofday()
> 
> Signed-off-by: Vladimir Nikulichev <nvs@...icks.com>

Annotation still doesn't work. but this is a start, so:

Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>


> 
> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
> index 3b7dbf5..6864661 100644
> --- a/tools/perf/util/symbol-elf.c
> +++ b/tools/perf/util/symbol-elf.c
> @@ -6,6 +6,7 @@
> #include <inttypes.h>
> 
> #include "symbol.h"
> +#include "vdso.h"
> #include <symbol/kallsyms.h>
> #include "debug.h"
> 
> @@ -618,6 +619,7 @@ int symsrc__init(struct symsrc *ss, struct dso *dso,
> const char *name,
>         GElf_Shdr shdr;
>         ss->adjust_symbols = (ehdr.e_type == ET_EXEC ||
>                 ehdr.e_type == ET_REL ||
> +                is_vdso_map(dso->short_name) ||
>                 elf_section_by_name(elf, &ehdr, &shdr,
>                              ".gnu.prelink_undo",
>                              NULL) != NULL);

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