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authorAdrian Hunter <adrian.hunter@intel.com>2020-05-12 15:19:18 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2020-07-10 08:20:01 -0300
commit246eba8e9041c4774738645c72b6efac7601db22 (patch)
treed56b865a1e0cd39f3264ac8b67d492ff35fefe21 /tools/include
parentb39730a6633d630b2a7bc61e597a0c671eb753b4 (diff)
downloadlinux-246eba8e9041c4774738645c72b6efac7601db22.tar.bz2
perf tools: Add support for PERF_RECORD_TEXT_POKE
Add processing for PERF_RECORD_TEXT_POKE events. When a text poke event is processed, then the kernel dso data cache is updated with the poked bytes. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: x86@kernel.org Link: http://lore.kernel.org/lkml/20200512121922.8997-12-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/include')
-rw-r--r--tools/include/uapi/linux/perf_event.h21
1 files changed, 20 insertions, 1 deletions
diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index 7b2d6fc9e6ed..e5bee6c17b86 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -383,7 +383,8 @@ struct perf_event_attr {
bpf_event : 1, /* include bpf events */
aux_output : 1, /* generate AUX records instead of events */
cgroup : 1, /* include cgroup events */
- __reserved_1 : 31;
+ text_poke : 1, /* include text poke events */
+ __reserved_1 : 30;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -1024,6 +1025,24 @@ enum perf_event_type {
*/
PERF_RECORD_CGROUP = 19,
+ /*
+ * Records changes to kernel text i.e. self-modified code. 'old_len' is
+ * the number of old bytes, 'new_len' is the number of new bytes. Either
+ * 'old_len' or 'new_len' may be zero to indicate, for example, the
+ * addition or removal of a trampoline. 'bytes' contains the old bytes
+ * followed immediately by the new bytes.
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u64 addr;
+ * u16 old_len;
+ * u16 new_len;
+ * u8 bytes[];
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_TEXT_POKE = 20,
+
PERF_RECORD_MAX, /* non-ABI */
};