linux-kernel - Re: [PATCH] perf, tool: Treat all memory maps without dso file as loaded

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Date:	Thu, 29 Sep 2011 19:09:47 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	a.p.zijlstra@...llo.nl, mingo@...e.hu, paulus@...ba.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf, tool: Treat all memory maps without dso file as
	loaded

Em Thu, Sep 29, 2011 at 06:11:03PM +0200, Jiri Olsa escreveu:
> > and here it is ;)
> 
> hi,
> any feedback?

I'm applying it now because the warning is annoying, but recently I
noticed that at least for vdso:


[admin@...icio x86_64]$ rpm -ql kernel-2.6.35.14-96.fc14 | grep vdso
/lib/modules/2.6.35.14-96.fc14.x86_64/vdso
/lib/modules/2.6.35.14-96.fc14.x86_64/vdso/vdso.so
/lib/modules/2.6.35.14-96.fc14.x86_64/vdso/vdso32-int80.so
/lib/modules/2.6.35.14-96.fc14.x86_64/vdso/vdso32-syscall.so
/lib/modules/2.6.35.14-96.fc14.x86_64/vdso/vdso32-sysenter.so
[admin@...icio x86_64]$ readelf -s /lib/modules/2.6.35.14-96.fc14.x86_64/vdso/vdso.so | head

Symbol table '.dynsym' contains 9 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
     0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND 
     1: ffffffffff70030c     0 SECTION LOCAL  DEFAULT    7 
     2: ffffffffff700830   133 FUNC    WEAK   DEFAULT   12 clock_gettime@@LINUX_2.6
     3: 0000000000000000     0 OBJECT  GLOBAL DEFAULT  ABS LINUX_2.6
     4: ffffffffff7008c0   139 FUNC    GLOBAL DEFAULT   12 __vdso_gettimeofday@@LINUX_2.6
     5: ffffffffff700950    61 FUNC    GLOBAL DEFAULT   12 __vdso_getcpu@@LINUX_2.6
     6: ffffffffff7008c0   139 FUNC    WEAK   DEFAULT   12 gettimeofday@@LINUX_2.6
[admin@...icio x86_64]$ rpm -ql kernel-debuginfo | grep vdso
/usr/lib/debug/lib/modules/2.6.35.14-96.fc14.x86_64/vdso
/usr/lib/debug/lib/modules/2.6.35.14-96.fc14.x86_64/vdso/vdso.so.debug
/usr/lib/debug/lib/modules/2.6.35.14-96.fc14.x86_64/vdso/vdso32-int80.so.debug
/usr/lib/debug/lib/modules/2.6.35.14-96.fc14.x86_64/vdso/vdso32-syscall.so.debug
/usr/lib/debug/lib/modules/2.6.35.14-96.fc14.x86_64/vdso/vdso32-sysenter.so.debug
[admin@...icio x86_64]$ 

So eventually we need to remove "[vdso]" from that function and make it use the
symtabs above.

- Arnaldo
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