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SubjectRe: [PATCH v3 10/30] perf clang: Add builtin clang support ant test case
Em Mon, Dec 05, 2016 at 08:51:01AM -0800, Alexei Starovoitov escreveu:
> On Fri, Dec 02, 2016 at 01:44:40PM -0200, Arnaldo Carvalho de Melo wrote:
> > Em Sat, Nov 26, 2016 at 07:03:34AM +0000, Wang Nan escreveu:
> > > Add basic clang support in clang.cpp and test__clang() testcase. The
> > > first testcase checks if builtin clang is able to generate LLVM IR.
> > >
> > > tests/clang.c is a proxy. Real testcase resides in
> > > utils/c++/clang-test.cpp in c++ and exports C interface to perf test
> > > subsystem.
> > >
> > > Test result:
> > >
> > > $ perf test -v clang
> > > 51: Test builtin clang support :
> > > 51.1: Test builtin clang compile C source to IR :
> > > --- start ---
> > > test child forked, pid 13215
> > > test child finished with 0
> > > ---- end ----
> > > Test builtin clang support subtest 0: Ok
> >
> > While testing this I noticed that the perf binary got huge, can't this
> > be done in some other way, i.e. using dynamic library?
> >
> > [root@jouet ~]# size /tmp/perf
> > text data bss dec hex filename
> > 75333688 1421584 23962176 100717448 600d388 /tmp/perf
> > [root@jouet ~]#
> >
> > I've built it with this:
> >
> > make LIBCLANGLLVM=1 O=/tmp/build/perf -C tools/perf install-bin
> >
> > the resulting binary:
> >
> > [acme@jouet linux]$
> > [acme@jouet linux]$ ls -la ~/bin/perf
> > -rwxr-xr-x. 2 acme acme 131689136 Dec 2 12:31 /home/acme/bin/perf
> > [acme@jouet linux]$ ls -lah ~/bin/perf
> > -rwxr-xr-x. 2 acme acme 126M Dec 2 12:31 /home/acme/bin/perf
> > [acme@jouet linux]$
> >
> > Huge, after stripping it:
> >
> > [acme@jouet linux]$ ls -la /tmp/perf
> > -rwxr-xr-x. 1 root root 76759056 Dec 2 12:33 /tmp/perf
> > [acme@jouet linux]$ ls -lah /tmp/perf
> > -rwxr-xr-x. 1 root root 74M Dec 2 12:33 /tmp/perf
> > [acme@jouet linux]$
> >
> > Still huge :-\
>
> yeah. it's kinda high. I'm guessing rpm llvm libs are in debug mode.
> Try llvm-config --build-mode --assertion-mode
> it should be Release OFF

It was ON, rebuilding it with

$ cmake -DCMAKE_BUILD_TYPE=Release /home/acme/git/llvm
$ make -j4

Will take a (another) while :-)

- Arnaldo

> > But being a n00b on llvm/clang libraries, etc, my question goes back to:
> > can we have this using a libllvm.so or libclang.so dynamic libraries?
>
> that can also work. The reason we build iovisor/bcc into single binary
> is to ease operational headache.

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