[lttng-dev] LTTNG on Android ICS

Ionut D. ionut5001 at gmail.com
Tue May 21 06:26:25 EDT 2013 

I tried to compile lttng-tools and at compile time exits with the bellow
error. I looked in the sources and it looks like for arm this is not
implemented. Do you have any idea about how could this be fixed?


In file included from
external/lttng-tools/src/common/compat/compat-fcntl.c:19:
external/lttng-tools/src/common/compat/../../../src/common/compat/fcntl.h:
In function 'splice':
external/lttng-tools/src/common/compat/../../../src/common/compat/fcntl.h:44:
error: '__NR_splice' undeclared (first use in this function)
external/lttng-tools/src/common/compat/../../../src/common/compat/fcntl.h:44:
error: (Each undeclared identifier is reported only once
external/lttng-tools/src/common/compat/../../../src/common/compat/fcntl.h:44:
error: for each function it appears in.)
In file included from
external/lttng-tools/src/common/compat/compat-fcntl.c:19:
external/lttng-tools/src/common/compat/../../../src/common/compat/fcntl.h:48:1:
warning: "POSIX_FADV_DONTNEED" redefined
In file included from
external/lttng-tools/src/common/compat/../../../src/common/compat/fcntl.h:47,
                 from
external/lttng-tools/src/common/compat/compat-fcntl.c:19:
bionic/libc/kernel/common/linux/fadvise.h:24:1: warning: this is the
location of the previous definition
In file included from bionic/libc/include/sys/select.h:34,
                 from bionic/libc/include/unistd.h:34,
                 from
external/lttng-tools/src/common/compat/compat-fcntl.c:20:
external/lttng-tools/src/common/compat/signal.h: At top level:
external/lttng-tools/src/common/compat/signal.h:27: error: expected ';',
',' or ')' before '*' token
external/lttng-tools/src/common/compat/signal.h:28: error: expected ';',
',' or ')' before '*' token
external/lttng-tools/src/common/compat/signal.h:29: error: expected ';',
',' or ')' before '*' token
In file included from bionic/libc/include/unistd.h:34,
                 from
external/lttng-tools/src/common/compat/compat-fcntl.c:20:
bionic/libc/include/sys/select.h:42: error: expected ';', ',' or ')' before
'*' token



On Sat, May 18, 2013 at 10:21 AM, Ionut D. <ionut5001 at gmail.com> wrote:

> Great informations! I will post back the results.
>
>
> On Fri, May 17, 2013 at 4:47 PM, Pierre-Luc St-Charles <
> pierre-luc.st-charles at polymtl.ca> wrote:
>
>> Alright, small update for all following a quick (non-mailing-list)
>> exchange:
>>
>> We did successfully complete a kernel-tracing port of LTTng for Android
>> (somewhat old news), but we are still working on bringing our patches back
>> up to date with the current version of the different projects (soon-ish
>> still applies here, we're talking days). So far, we dwelled a little bit in
>> LTTng-UST, but haven't done much changes, so userspace tracing is still not
>> functional. Device that ran kernel traces successfully so far were the
>> Nexus S and the Nexus 7 (example Nexus S trace available here<https://drive.google.com/folderview?id=0B55Ba7lWTLh4U0hGeTQ4bmRYRjQ&usp=sharing>;
>> still not perfect).
>>
>> Basically, we cross-compiled everything via the Android NDK (no Android
>> makefiles involved here), and pushed all required bins to a device without
>> having to flash it (unless the default kernel config didn't allow tracing
>> -- then we'd have to flash). This approach is not compatible with the
>> official Android build system (meaning we wouldn't be able to add it to
>> Android like this), but we might eventually get working on the damned
>> Android makefiles (they're extremely painful to write, especially since
>> LTTng uses Autotools).
>>
>> The librairies required by LTTng that are not already included in a
>> regular Android build (uuid/popt) can actually be found/compiled from the
>> official repo, in its 'external' directory (see oprofile and e2fsprog --
>> from memory). That might not be the easiest way to get them (full repo
>> download is BIG), but compatibility is assured, and you can skip a full
>> build by simply making those two individually for your device (if that's
>> all you need).
>>
>> You'll also need your device to be rooted to use LTTng at all; then, most
>> initializations are done via scripts (we'll also provide those with our
>> patches). We still had some trouble automating everything via daemons, so
>> we always ran the sessiond locally (with success).
>>
>> Major problems we encountered so far were missing posix functions, and
>> sysv shared memory. Basically, Android relies on Bionic for its system
>> calls and other low-level functions, and since Bionic is pretty
>> 'lightweight', they trimmed most of the fat out for performance. We had to
>> make some more-or-less sketchy replacements here and there, but everything
>> seems to be working decently now.
>>
>> So, simple 'how do I put LTTng on Android' workflow would be this:
>>
>>   - Compile modules (using NDK) against device's kernel, making sure its
>> config is appropriate, ship them over via ADB
>>
>>   - Compile required external libraries (using repo build system) for the
>> device, ship them over via ADB
>>
>>   - Patch up LTTng-* (soon-ish! I could send you the outdated patches
>> right now if you're interested though, they might be a month behind or so
>> on the current trunks)
>>
>>   - Cross-compile LTTng-* for the device (using NDK), ship binaries over
>> via ADB
>>
>> Then, on the device, start up the sessiond manually & start tracing.
>>
>>
>> I think I went over everything, but if there's a part that's still
>> cloudy, don't hesitate.
>>
>>
>> -PL
>>
>>
>> On May 17, 2013 1:32 AM, "Ionut D." <ionut5001 at gmail.com> wrote:
>>
>>> Hello all,
>>>
>>> Recently I started to integrate LTTNG in Android ICS by compiling each
>>> package, each dependency, by using the Android build system. It is a lot of
>>> work because I met different problems and to be sincere, I do not know if
>>> at the end will work and I do not know how much I will need to modify the
>>> sources in order to work.
>>>
>>> My questions are about this integration. I mention that I read a lot of
>>> discussions about this on Internet, on this mailing list, but the things
>>> are still not very clear for me.
>>>
>>> It is ok? what I am trying to do ? to integrate and build by using the
>>> Android build system.
>>> Could you give me some guidelines, indications about how I should
>>> proceed, maybe a tutorial or maybe some android make files/patches that
>>> would help me to see how the job must be done and if I am doing it right ?
>>>
>>> Until now I managed to build lttng-modules, liburcu, libuuid from
>>> util-linux and configure lttng-ust by using the android toolchain for arm.
>>> I got a lot of errors but until now I managed to configure/make these
>>> packages.
>>>
>>> I mention that I am trying to build lttng 2.x on ICS 4.0.3.
>>>
>>> Would be great if you will give me a tutorial about how to do it.
>>>
>>> Ionut
>>>
>>> _______________________________________________
>>> lttng-dev mailing list
>>> lttng-dev at lists.lttng.org
>>> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>>>
>>>
>
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