发自我的 iPhone
> 在 2015年8月3日,下午11:19,Arnaldo Carvalho de Melo <a...@kernel.org> 写道: > > 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 What's the content of your foo.c? Could you please have a look? I considered moving .o enabler down so when you see that patch the filter will be workable. However , like the llvm support, doing so will enable a bulk of code by one patch, that's not good. Moving .c enabler down is easy. Now I'm working on a BPF testcase. Tomorrow you will see a new test: # perf test BPF It enforces test__llvm, and forks a 'perf record' to do the filtering, then checks the result using perf report -D. The patch of the new test is a mark which indicates the basic function of BPF filter is done. What do you think about this idea? Thank you. > 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/