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authorWang Nan <wangnan0@huawei.com>2016-11-26 07:03:28 +0000
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-11-29 12:13:27 -0300
commita074865e60edd762b99ec5dacec69b406f702e66 (patch)
tree774e0abac8cf015dad77638c3c79aa56609dbb82 /tools/perf/util/Build
parent5a6acad17d2e81765dd4c2fce7346a6f045eab25 (diff)
perf tools: Introduce perf hooks
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>
Diffstat (limited to 'tools/perf/util/Build')
-rw-r--r--tools/perf/util/Build2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 1dc67efad634..b2a47aac8d1c 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -123,6 +123,8 @@ libperf-$(CONFIG_LIBELF) += genelf.o
libperf-$(CONFIG_DWARF) += genelf_debug.o
endif
+libperf-y += perf-hooks.o
+
CFLAGS_config.o += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
# avoid compiler warnings in 32-bit mode
CFLAGS_genelf_debug.o += -Wno-packed