[llvmlinux] GSoC project ideas brainstorm
behanw at converseincode.com
Tue Mar 19 19:08:50 UTC 2013
On 03/19/13 10:29, Jan-Simon Möller wrote:
> Hi all!
> Find my comments (after having slept over it ;) ) inline ...
> Am Montag, 18. März 2013, 22:35:31 schrieb Tinti:
>> On Mon, Mar 18, 2013 at 2:20 PM, Jan-Simon Möller <dl9pf at gmx.de> wrote:
>>> Hi all!
>>> I'd like to start a brainstorm session on topics for GSoC. The org
>>> application phase starts now and we'll apply.
>>> I'd propose to have 3-5 ideas available with different level of
>>> - beaglebone target / $board target - including upstreaming and
>> Nice. Would be great specially for the new beaglebone.
> I like the idea, but have doubts if it is enough work for the time of gsoc.
> We'd need to define tasks around that - e.g. debugging / remote debugging for
> the target included.
I don't think it will be enough work for gsoc.
>>> - work on infra (build infra or buildbot/jenkins?)
>> Nice. But what exactly? Do we still need to use chroot? If we do, we could
>> work on fakeroot or the Yocto equivalent.
> No specific Idea right now - maybe Behan has more ideas here. I'd spend more
> time on the actual linux/llvm side.
I think this would need to include a complete rebuild of the buildbot
with a lot more test cases, multiple architecture builds etc.
>>> - Extend buildbot for x86
> Maybe not enough content wise - combine with others.
This would probably be bundled with the previous.
>>> - Add full ltp run with reporting
> Can be a good topic if done with reporting.
>>> - Add reporting of error/warning/msg statistics (how many warnings of
>>> type X)
>> Nice and very useful. Like a report at the end of the build: you have
>> warning X in the file.c:13 file3.c:19
>> Specially if this report could be stored by buildbot.
> Exactly. How many errors of type "foo" happened during that build and so on:
> Example: http://clang.debian.net/ -> rebuild results
>>> - checker
>> Do you mean the --emit-llvm and .bc? Yes, very good.
> I mean the static analysis tool.
Yeah. Getting it working with the kernel, extending it for common kernel
> Otherwise another highly experimental idea : compile the kernel to .bc and
> link it with llvm-link and then produce target specific code from there.
> Completely different compilation workflow as we use it right now.
A sort of half compiled kernel? I'm really not sure how this would be
useful. The BC would still be intended for a particular arch (since you
can't compile for more than one arch at a time). For a purely analysis
point of view, separate bc files would likely be all that's necessary,
and somebody has done that already.
It would probably me more about a tool around the bc files to analyze
the kernel code in some way (hopefully in a bid to make llvm toolset
more attractive to the kernel community). However, I'm not sure any of
us are qualified to specify that kind of work and/or project.
>>> - llvm macros, llvm + realmode
>> Nice. And how about llvm/clang self hosted (I mean try our builds from
>> llvm/clang built by llvm/clang)?
> Yes, but thats not really hard - we're just lazy and don't want to spend the
> time for the extra cycles.
I agree. Self hosted clang would be trivial, and largely a waste of time.
>>> - tracing, benchmarking, fix all errors in "make allyesconfig"
Some sort of complete validation suite on the complete kernel.
>> My suggestions:
>> - analyze common errors in mainline kernel and check if some of them could
>> be upstream. Once I found an ; in a if statement.
> This could be combined with the reporting above (how many warnings/errors of
> type X) and so on.
This is probably merely part of the checker work above.
>> - run Android CTS test in Nexus 7 and check if it has some parts broken or
>> not. Try to fix the ones that are broken.
>> - llvm/clang self hosted.
Finishing/validating an LLVM Android build? Would be cool.
>> - llvm/clang for u-boot. Would be nice to see what we get from these
> Same - core topic ? It helps on the boards for sure - no question. But thats
> step 2 for us right now.
>> - llvm/clang for buildroot. Same as before.
Both of these are probably beyond the scope of our project, which is
using clang with the Linux kernel.
Ideally a gsoc candidate would help the LLVMLinux project increase the
adoption of clang with the kernel community, or help with work which
will support getting patches upstream.
behanw at converseincode.com
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