linux-kernel - Re: [PATCH] perf symbols: Fix wrong symbol offset according to p

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Date:	Mon, 11 Jan 2016 12:25:34 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	He Kuang <hekuang@...wei.com>
Cc:	peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
	jolsa@...hat.com, rabin.vincent@...s.com, namhyung@...nel.org,
	wangnan0@...wei.com, mark.rutland@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf symbols: Fix wrong symbol offset according to p_addr


* He Kuang <hekuang@...wei.com> wrote:

> Perf missed the 'VirtAddr' value in elf program_headers when adjusting
> symbol address for dynamic libraries. This patch considers the p_addr
> value and gets the right symbol offset.

s/gets/calculates

> 
> Before this patch, some symbols can not be right parsed on android phone:

s/Before this patch, some symbols are not parsed correctly on android phones:

> 
>   init   369 [002]   339.970607: raw_syscalls:sys_enter: NR 22 (b, 7fd9e360a0, 10, ffffffff, 0, 8)
>                      ...
>                    230ac [unknown] (/system/lib64/libsurfaceflinger.so)
>                     11a0 main (/system/bin/surfaceflinger)
>                    1c3fc __libc_init (/system/lib64/libc.so)
>                      fd0 _start (/system/bin/surfaceflinger)
>                     29ec __dl__start (/system/bin/linker64)
> 
> After this patch:
> 
>   init   369 [002]   339.970607: raw_syscalls:sys_enter: NR 22 (b, 7fd9e360a0, 10, ffffffff, 0, 8)
>                      ...
>                    3a0ac _ZN7android14SurfaceFlinger3runEv (/system/lib64/libsurfaceflinger.so)
>                     11a0 main (/system/bin/surfaceflinger)
>                    1c3fc __libc_init (/system/lib64/libc.so)
>                      fd0 _start (/system/bin/surfaceflinger)
>                     29ec __dl__start (/system/bin/linker64)

> --- a/tools/perf/util/dso.h
> +++ b/tools/perf/util/dso.h
> @@ -166,6 +166,7 @@ struct dso {
>  	const char	 *long_name;
>  	u16		 long_name_len;
>  	u16		 short_name_len;
> +	u64		vaddr;
>  	void		*dwfl;			/* DWARF debug info */

btw., looks like there's some extra spaces in front of those other field 
definitions.

Also, might make sense to describe what 'vaddr' stands for precisely, the naming 
is pretty ambiguous.

Thanks,

	Ingo