Re: [Valgrind-users] Valgrind works with APK's?

[Marc S. <mar...@gm...>]

All my tries using logwrapper always ends with a system death and the
kernel reboot.

And of course Dalvik has a built-in debugging systeam using JDWP and little
extensions for DDMS. But this only works when the system is in debugging
mode.

And I need to break that restriction. Thats why Im trying to instrument DVM
with Valgrind.


2013/11/22 Josef Weidendorfer <Jos...@gm...>

> Am 21.11.2013 21:06, schrieb Marc Sampé:
> > In Android most of people uses APK as aplication not as file. But I
> > didn't understand if it works or not with an application (apk) running
> > inside the DVM.
>
> It may work, but you get the call-graph of how Dalvik is executing
> your application (ie. the internal functions executed in Dalvik for
> translating, or for GC, and so on).
> Most probably, this is not what you want. Unless you want to profile
> own native code behind JNI.
>
> Any good high-level-language VM should have a profiler built in.
> Not sure about Dalvik.
>
> Josef
>
> >
> >
> > 2013/11/21 John Reiser <jr...@bi... <mailto:
> jr...@bi...>>
> >
> >     > I'm trying to use callgrind with an APK in the emulator with API15
> >     and valgrind 3.9 without any success.
> >     >
> >     > Can valgrind instrument APKs or not?
> >
> >     No.  An .apk is a file which is a container for many kinds of
> >     information.
> >     Valgrind tools instrument the instantiation of a process, and not a
> >     container.
> >
> >     The "hook" for valgrind, the place where valgrind intercepts control
> >     and begins co-execution of the valgrind tool with the target
> >     program, is execve().
> >     execve() is an very clean interface.  The operating system discards
> >     entirely
> >     the old memory image, and instantiates a new memory image "from
> >     scratch."
> >     This cleanliness is essential for the valgrind tool to identify and
> >     understand easily the initial state of what is being instrumented.
> >
> >     --
> >
> >
> >
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> > --
> > Marc
> >
> >
> >
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-- 
Marc