perf, x86: Improve the PEBS ABI

Rename perf_event_attr::precise to perf_event_attr::precise_ip and
widen it to 2 bits. This new field describes the required precision of
the PERF_SAMPLE_IP field:

  0 - SAMPLE_IP can have arbitrary skid
  1 - SAMPLE_IP must have constant skid
  2 - SAMPLE_IP requested to have 0 skid
  3 - SAMPLE_IP must have 0 skid

And modify the Intel PEBS code accordingly. The PEBS implementation
now supports up to precise_ip == 2, where we perform the IP fixup.

Also s/PERF_RECORD_MISC_EXACT/&_IP/ to clarify its meaning, this bit
should be set for each PERF_SAMPLE_IP field known to match the actual
instruction triggering the event.

This new scheme allows for a PEBS mode that uses the buffer for more
than a single event.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 16 insertions, 9 deletions

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index bc8b7e614207..ae7f5917935c 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -654,10 +654,6 @@ parse_raw_event(const char **strp, struct perf_event_attr *attr)
                 return EVT_FAILED;
         n = hex2u64(str + 1, &config);
         if (n > 0) {
-                if (str[n+1] == 'p') {
-                        attr->precise = 1;
-                        n++;
-                }
                 *strp = str + n + 1;
                 attr->type = PERF_TYPE_RAW;
                 attr->config = config;
@@ -692,19 +688,29 @@ static enum event_result
 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
 {
         const char *str = *strp;
-        int eu = 1, ek = 1, eh = 1;
+        int exclude = 0;
+        int eu = 0, ek = 0, eh = 0, precise = 0;
 
         if (*str++ != ':')
                 return 0;
         while (*str) {
-                if (*str == 'u')
+                if (*str == 'u') {
+                        if (!exclude)
+                                exclude = eu = ek = eh = 1;
                         eu = 0;
-                else if (*str == 'k')
+                } else if (*str == 'k') {
+                        if (!exclude)
+                                exclude = eu = ek = eh = 1;
                         ek = 0;
-                else if (*str == 'h')
+                } else if (*str == 'h') {
+                        if (!exclude)
+                                exclude = eu = ek = eh = 1;
                         eh = 0;
-                else
+                } else if (*str == 'p') {
+                        precise++;
+                } else
                         break;
+
                 ++str;
         }
         if (str >= *strp + 2) {
@@ -712,6 +718,7 @@ parse_event_modifier(const char **strp, struct perf_event_attr *attr)
                 attr->exclude_user   = eu;
                 attr->exclude_kernel = ek;
                 attr->exclude_hv     = eh;
+                attr->precise_ip     = precise;
                 return 1;
         }
         return 0;