Merge tag 'perf-core-for-mingo-20161201' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

New features:

 - Support AArch64 in the 'annotate' code, native/local and
   cross-arch/remote (Kim Phillips)

 - Allow considering just events in a given time interval, via the
   '--time start.s.ms,end.s.ms' command line, added to 'perf kmem',
   'perf report', 'perf sched timehist' and 'perf script' (David Ahern)

 - Add option to stop printing a callchain at one of a given group of
   symbol names (David Ahern)

 - Handle CPU migration events in 'perf sched timehist' (David Ahern)

 - Track memory freed in 'perf kmem stat' (David Ahern)

Infrastructure:

 - Add initial support (and perf test entry) for tooling hooks, starting with
   'record_start' and 'record_end', that will have as its initial user the
   eBPF infrastructure, where perf_ prefixed functions will be JITed and
   run when such hooks are called (Wang Nan)

 - Remove redundant "test" and similar strings from 'perf test' descriptions
   (Arnaldo Carvalho de Melo)

 - Implement assorted libbpf improvements (Wang Nan)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/tools/perf/tests/perf-hooks.c b/tools/perf/tests/perf-hooks.c
new file mode 100644
index 000000000000..9338cb2c25ab
--- /dev/null
+++ b/tools/perf/tests/perf-hooks.c
@@ -0,0 +1,44 @@
+#include <signal.h>
+#include <stdlib.h>
+
+#include "tests.h"
+#include "debug.h"
+#include "util.h"
+#include "perf-hooks.h"
+
+static void sigsegv_handler(int sig __maybe_unused)
+{
+	pr_debug("SIGSEGV is observed as expected, try to recover.\n");
+	perf_hooks__recover();
+	signal(SIGSEGV, SIG_DFL);
+	raise(SIGSEGV);
+	exit(-1);
+}
+
+static int hook_flags;
+
+static void the_hook(void)
+{
+	int *p = NULL;
+
+	hook_flags = 1234;
+
+	/* Generate a segfault, test perf_hooks__recover */
+	*p = 0;
+}
+
+int test__perf_hooks(int subtest __maybe_unused)
+{
+	signal(SIGSEGV, sigsegv_handler);
+	perf_hooks__set_hook("test", the_hook);
+	perf_hooks__invoke_test();
+
+	/* hook is triggered? */
+	if (hook_flags != 1234)
+		return TEST_FAIL;
+
+	/* the buggy hook is removed? */
+	if (perf_hooks__get_hook("test"))
+		return TEST_FAIL;
+	return TEST_OK;
+}