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SubjectRe: [PATCH 2/3] perf tools: Add callchain order support for libunwind DWARF unwinder
On Wed, Nov 18, 2015 at 08:54:31AM +0100, Jiri Olsa wrote:
> On Wed, Nov 18, 2015 at 12:13:08PM +0800, Wangnan (F) wrote:
>
> SNIP
>
> > 3.38% a.out a.out [.] funcc
> > |
> > ---funcc
> > |
> > |--2.70%-- funcb
> > | funca
> > | main
> > | __libc_start_main
> > | _start
> > |
> > --0.68%-- 0
> >
> >
> > I'm not sure whether we can regard this behavior changing as a bugfix? I
> > think
> > there may be some reason the original code explicitly avoid creating an '0'
> > entry.
> >
> > Then I tried to find why perf can't get call frame on my case, and
> > I guess there's something wrong whe dealing with 'call' command, because
> > the instruction on it I can't get callchain from libunwind is a 'callq':
> >
> > ...
> > 4005bf: be 00 00 00 00 mov $0x0,%esi
> > 4005c4: 48 89 c7 mov %rax,%rdi
> > 4005c7: e8 74 fe ff ff callq 400440 <gettimeofday@plt>
> > us2 = tv2.tv_sec * 1000000 + tv2.tv_usec;
> > 4005cc: 48 8b 04 24 mov (%rsp),%rax
> > ...
> >
> > But this is another problem, we can discuss it in a new thread.
>
> so the problem is you dont see the gettimeofday call at the end?
>
> could you share the test code?

just saw your other email on this issue.. let's continue there

jirka


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