From 5a5e3d3ceae2121590d67258a4e658d938b4a46d Mon Sep 17 00:00:00 2001 From: Ravi Bangoria Date: Mon, 20 Aug 2018 10:12:50 +0530 Subject: perf probe: Support SDT markers having reference counter (semaphore) With this, perf buildid-cache will save SDT markers with reference counter in probe cache. Perf probe will be able to probe markers having reference counter. Ex, # readelf -n /tmp/tick | grep -A1 loop2 Name: loop2 ... Semaphore: 0x0000000010020036 # ./perf buildid-cache --add /tmp/tick # ./perf probe sdt_tick:loop2 # ./perf stat -e sdt_tick:loop2 /tmp/tick hi: 0 hi: 1 hi: 2 ^C Performance counter stats for '/tmp/tick': 3 sdt_tick:loop2 2.561851452 seconds time elapsed Link: http://lkml.kernel.org/r/20180820044250.11659-5-ravi.bangoria@linux.ibm.com Acked-by: Arnaldo Carvalho de Melo Acked-by: Masami Hiramatsu Acked-by: Srikar Dronamraju Reviewed-by: Song Liu Tested-by: Song Liu Signed-off-by: Ravi Bangoria Signed-off-by: Steven Rostedt (VMware) --- tools/perf/util/probe-file.h | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/perf/util/probe-file.h') diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h index 63f29b1d22c1..2a249182f2a6 100644 --- a/tools/perf/util/probe-file.h +++ b/tools/perf/util/probe-file.h @@ -69,6 +69,7 @@ struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache, int probe_cache__show_all_caches(struct strfilter *filter); bool probe_type_is_available(enum probe_type type); bool kretprobe_offset_is_supported(void); +bool uprobe_ref_ctr_is_supported(void); #else /* ! HAVE_LIBELF_SUPPORT */ static inline struct probe_cache *probe_cache__new(const char *tgt __maybe_unused, struct nsinfo *nsi __maybe_unused) { -- cgit v1.2.3