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perf tools: Add support for PERF_RECORD_TEXT_POKE

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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>
This commit is contained in:
Adrian Hunter 2020-05-12 15:19:18 +03:00 • committed by Arnaldo Carvalho de Melo
parent b39730a663
commit 246eba8e90
14 changed files with 216 additions and 3 deletions
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21
tools/include/uapi/linux/perf_event.h
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@ -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 */
};