linux-kernel - Re: [PATCH v3 10/30] perf clang: Add builtin clang support ant test case

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Date:   Tue, 6 Dec 2016 18:02:12 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Wang Nan <wangnan0@...wei.com>, ast@...com, lizefan@...wei.com,
        hekuang@...wei.com, Ingo Molnar <mingo@...nel.org>,
        linux-kernel@...r.kernel.org, pi3orama@....com, joe@....org,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH v3 10/30] perf clang: Add builtin clang support ant test
 case

Em Tue, Dec 06, 2016 at 04:19:34PM -0300, Arnaldo Carvalho de Melo escreveu:
> 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:
> > >   make LIBCLANGLLVM=1 O=/tmp/build/perf -C tools/perf install-bin
> > > 
> > > the resulting binary:
> > > 
> > > [acme@...et linux]$ 
> > > [acme@...et linux]$ ls -la ~/bin/perf
> > > -rwxr-xr-x. 2 acme acme 131689136 Dec  2 12:31 /home/acme/bin/perf
> > > [acme@...et linux]$ ls -lah ~/bin/perf
> > > -rwxr-xr-x. 2 acme acme 126M Dec  2 12:31 /home/acme/bin/perf
> > > [acme@...et linux]$
> > > 
> > > Huge, after stripping it:
> > > 
> > > [acme@...et linux]$ ls -la /tmp/perf
> > > -rwxr-xr-x. 1 root root 76759056 Dec  2 12:33 /tmp/perf
> > > [acme@...et linux]$ ls -lah /tmp/perf
> > > -rwxr-xr-x. 1 root root 74M Dec  2 12:33 /tmp/perf
> > > [acme@...et 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 :-)

Almost halved the size:

[acme@...et build]$ llvm-config --build-mode --assertion-mode
Release
OFF
[acme@...et build]$ clang -v
clang version 4.0.0 (http://llvm.org/git/clang.git b7a0d79a6691813bf7d6ade1b4e8b21fd502f50a) (http://llvm.org/git/llvm.git 3a783f8716bfc621355e8ae61daf3a2093c341fc)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/6.2.1
Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/6.2.1
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
[acme@...et build]$ llvm-config --version
4.0.0svn
[acme@...et build]$

[acme@...et linux]$ ls -la /tmp/perf
-rwxr-xr-x. 1 acme acme 63641016 Dec  6 17:58 /tmp/perf
[acme@...et linux]$ size /tmp/perf
   text	   data	    bss	    dec	    hex	filename
40877921	1577232	24065712	66520865	3f70721
/tmp/perf
[acme@...et linux]$ strip /tmp/perf
[acme@...et linux]$ ls -la /tmp/perf
-rwxr-xr-x. 1 acme acme 42460904 Dec  6 17:58 /tmp/perf
[acme@...et linux]$ ls -lah /tmp/perf
-rwxr-xr-x. 1 acme acme 41M Dec  6 17:58 /tmp/perf
[acme@...et linux]$ size /tmp/perf
   text	   data	    bss	    dec	    hex	filename
40877921	1577232	24065712	66520865	3f70721
/tmp/perf
[acme@...et linux]$