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2016-12-05perf tools: Pass context to perf hook functionsWang Nan1-2/+4
Pass a pointer to perf hook functions so they receive context information during setup. Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Joe Stringer <joe@ovn.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-6-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-11-29perf tools: Introduce perf hooksWang Nan1-0/+37
Perf hooks allow hooking user code at perf events. They can be used for manipulation of BPF maps, taking snapshot and reporting results. In this patch two perf hook points are introduced: record_start and record_end. To avoid buggy user actions, a SIGSEGV signal handler is introduced into 'perf record'. It turns off perf hook if it causes a segfault and report an error to help debugging. A test case for perf hook is introduced. Test result: $ ./buildperf/perf test -v hook 50: Test perf hooks : --- start --- test child forked, pid 10311 SIGSEGV is observed as expected, try to recover. Fatal error (SEGFAULT) in perf hook 'test' test child finished with 0 ---- end ---- Test perf hooks: Ok Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Joe Stringer <joe@ovn.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-5-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>