Re: [lmi] perf+wine

[Vadim Zeitlin]

On Fri, 2 Mar 2018 11:30:55 +0000 Greg Chicares <address@hidden> wrote:

GC> On 2018-02-28 13:15, Vadim Zeitlin wrote:
GC> [...]
GC> >  Also, running perf under Linux is always worthwhile -- and very simple to
GC> > do, so I'd also do this and see if you notice anything unusual in its
GC> > output. You could run just the Wine process itself under it or even run it
GC> > system-wide, if your system is reasonably idle, Wine should dominate all
GC> > the statistics anyhow.
GC> $perf record wine ./lmi_wx_shared --ash_nazg --data_path=/opt/lmi/data
GC> 
GC> $perf report
GC> Samples: 350K of event 'cycles', Event count (approx.): 260014842317
GC> Overhead  Command        Shared Object      Symbol
GC>   66.60%  lmi_wx_shared  [unknown]          [.] 0x000000007bc50843
GC>    1.04%  lmi_wx_shared  [unknown]          [.] 0x000000007bc50830
GC>    0.69%  lmi_wx_shared  [unknown]          [.] 0x000000007bc3d88c
GC>    0.67%  lmi_wx_shared  perf-19333.map     [.] 0x000000006d0d38dc
GC>    0.65%  lmi_wx_shared  [unknown]          [.] 0x000000007bc3d744

 Argh, sorry, it looks painfully obvious, but, of course, perf is not going
to show anything useful for lmi_wx_shared as it doesn't know anything about
the symbols in PE files :-(

GC> $perf report -s sym,srcline
GC>   66.60%  [.] 0x000000007bc50843                      ??:0
GC>    1.04%  [.] 0x000000007bc50830                      ??:0
GC>    0.69%  [.] 0x000000007bc3d88c                      ??:0
GC>    0.67%  [.] 0x000000006d0d38dc                      
perf-19333.map[6d0d38dc]
GC>    0.65%  [.] 0x000000007bc3d744                      ??:0
GC> 
GC> /opt/lmi/bin[0]$addr2line -e ./lmi_wx_shared.exe 0x000000007bc50843
GC> ??:0
GC> /opt/lmi/bin[0]$i686-w64-mingw32-addr2line -e ./lmi_wx_shared.exe 
0x000000007bc50843 
GC> ??:0

 I think this doesn't work because you need to subtract the load address
from this address. I'm not sure how to find it though, I'll have to
experiment with it.

GC> Is there a simple magical incantation that translates
GC>     66.60%  lmi_wx_shared  [unknown]          [.] 0x000000007bc50843
GC> to a symbol name?

 Let me check in my grimoires and I'll get back to you a.s.a.p...
VZ