Em Mon, Aug 03, 2015 at 12:07:28PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Aug 03, 2015 at 10:37:59AM +0800, Wangnan (F) escreveu:
> > On 2015/8/1 4:31, Arnaldo Carvalho de Melo wrote:
> > >Somehow it is not calling what the changeset says it would call when
> > >passing
> > >"-e foo.o", investigating...
>
> > Have you tried
>
> > /root/bin/perf record -e ./foo.o sleep 1
>
> > The key is './'.
>
> Nope, trying it now I get:
>
> [root@felicio ~]# perf record -e ./foo.o sleep 1
> libbpf: failed to open ./foo.o: No such file or directory
> bpf: failed to load ./foo.o
And with a .c suffix:
[root@felicio ~]# perf record -e ./foo.c sleep 1
clang-3.8: error: no such file or directory: '/root/./foo.c'
clang-3.8: error: no input files
ERROR: unable to compile ./foo.c
Hint: Check error message shown above.
LLVM 3.7 or newer is required. Which can be found from http://llvm.org
You may want to try git trunk:
git clone http://llvm.org/git/llvm.git
and
git clone http://llvm.org/git/clang.git
Or fetch the latest clang/llvm 3.7 from pre-built llvm packages for
debian/ubuntu:
http://llvm.org/apt
If you are using old version of clang, change 'clang-bpf-cmd-template'
option in [llvm] section of ~/.perfconfig to:
"$CLANG_EXEC $CLANG_OPTIONS $KERNEL_INC_OPTIONS \
-working-directory $WORKING_DIR -c $CLANG_SOURCE \
-emit-llvm -o - | /path/to/llc -march=bpf -filetype=obj -o -"
(Replace /path/to/llc with path to your llc)
Hint: You can also pre-compile it into .o
invalid or unsupported event: './foo.c'
Run 'perf list' for a list of valid events
usage: perf record [<options>] [<command>]
or: perf record [<options>] -- <command> [<options>]
-e, --event <event> event selector. use 'perf list' to list available
events
[root@felicio ~]#
Now to find a hello.c BPF scriptlet...
- Arnaldo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
