Re: No useful callgraphs on Fedora 27

On Sun, 11 Feb 2018, Clemens Eisserer wrote:
> Hi,
> 
> I would like to use oprofile to analyze some interaction between a poor
> performing graphical program and the Xorg x-server.
> I know the function which consumes most of the cpu cycles (fbBltOne),
> and a callstack could help to diagnose which X11 protocol request
> causes this behaviour.
> 
> However on fedora 27, despite having all the debuginfo-packages
> installed, I don't get a useful callgraph:
> 
> 
> CPU: AMD64 family15h, speed 4000 MHz (estimated)
> Counted CPU_CLK_UNHALTED events (CPU Clocks not Halted) with a unit
> mask of 0x00 (No unit mask) count 100000
> samples  %        image name               symbol name
> -------------------------------------------------------------------------------
> 167267   37.1351  libfb.so                 fbBltOne
>   167267   100.000  libfb.so                 fbBltOne [self]
> -------------------------------------------------------------------------------
> 45871    10.1839  libc-2.26.so             __memcpy_ssse3
>   45871    100.000  libc-2.26.so             __memcpy_ssse3 [self]
> -------------------------------------------------------------------------------
> 17944     3.9838  kallsyms                 copy_user_generic_string
>   17944    100.000  kallsyms                 copy_user_generic_string [self]
> -------------------------------------------------------------------------------
> 
Hi, how could I reproduce the problem? What commands did you use?

Cheers,
Michael

> Any ideas what could be wrong with my system?
> 
> Thank you in advance & best regards, Clemens
> 
> PS: Sorry for the cross-post (sysprof mailing list), I posted there
> before I realized there isn't much traffic going on.
> 
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