On Fri, Apr 15, 2016 at 09:38:03AM +0200, Ivo Raisr wrote:
> 2016-04-15 2:56 GMT+02:00 John Reiser <jrei...@bitwagon.com>:
> > ===== massif/tests/new-cpp.post.diff (post)
> > - 1 4,008 4,008 4,000 8
> > 0
> > - 2 8,016 8,016 8,000 16
> > 0
> > - 3 10,024 10,024 10,000 24
> > 0
> > - 4 12,032 12,032 12,000 32
> > 0
> > - 5 12,032 12,032 12,000 32
> > 0
> > -99.73% (12,000B) (heap allocation functions) malloc/new/new[],
> > --alloc-fns, etc.
> > -->33.24% (4,000B) 0x........: main (new-cpp.cpp:19)
> > + 1 72,712 72,712 72,704 8
> > 0
> > + 2 76,720 76,720 76,704 16
> > 0
> > + 3 80,728 80,728 80,704 24
> > 0
> > + 4 82,736 82,736 82,704 32
> > 0
> > + 5 84,744 84,744 84,704 40
> > 0
> > + 6 84,744 84,744 84,704 40
> > 0
> > +99.95% (84,704B) (heap allocation functions) malloc/new/new[],
> > --alloc-fns, etc.
> > +->85.79% (72,704B) 0x........: ??? (in /usr/lib64/libstdc++.so.6.0.21)
> > +| ->85.79% (72,704B) 0x........: call_init.part.0 (dl-init.c:72)
> > +| ->85.79% (72,704B) 0x........: _dl_init (dl-init.c:30)
> > +| ->85.79% (72,704B) 0x........: ??? (in /usr/lib64/ld-2.21.so)
> > +|
> > +->04.72% (4,000B) 0x........: main (new-cpp.cpp:19)
> >
> > I believe that this change in output from massif has the same underlying
> > cause
> > as the change above in the output from memcheck.
> >
>
> Agreed. I tried to fix this in bug 345307 ignoring allocations
> done by _GLOBAL__sub_I_eh_alloc.cc. This worked for Linux/Ubuntu 15.10
> and Solaris 12. Apparently on this distribution, things are a bit different
> so another
> function needs to be ignored. A little investigation should show what needs
> to be done here.
The issue I believe is that unless we have the full symtab (from the
separate libstdc++-debuginfo package) we don't know the name of the
function. For memcheck the following suppression seems to work, with
a variant that is stripped and one with full symtab debug symbols:
{
malloc-leaks-cxx-stl-string-classes
Memcheck:Leak
match-leak-kinds: reachable
fun:malloc
obj:*/*lib*/libstdc++.so*
fun:call_init.part.0
fun:call_init
fun:_dl_init
obj:/usr/*lib*/ld-2.*.so
}
{
malloc-leaks-cxx-stl-string-classes-debug
Memcheck:Leak
match-leak-kinds: reachable
fun:malloc
fun:pool
fun:__static_initialization_and_destruction_0
fun:_GLOBAL__sub_I_eh_alloc.cc
fun:call_init.part.0
fun:call_init
fun:_dl_init
obj:/usr/*lib*/ld-2.*.so
}
I don't know how to do a similar dual suppression using the massif
--ignore-fn option.
Cheers,
Mark
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