perf_counter: use misc field to widen type

Push the PERF_EVENT_COUNTER_OVERFLOW bit into the misc field so that
we can have the full 32bit for PERF_RECORD_ bits.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090408130408.891867663@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 10 insertions, 18 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 5bd8817b12d4..4809ae18a940 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -201,8 +201,9 @@ struct perf_counter_mmap_page {
         __u32   data_head;              /* head in the data section */
 };
 
-#define PERF_EVENT_MISC_KERNEL  (1 << 0)
-#define PERF_EVENT_MISC_USER    (1 << 1)
+#define PERF_EVENT_MISC_KERNEL          (1 << 0)
+#define PERF_EVENT_MISC_USER            (1 << 1)
+#define PERF_EVENT_MISC_OVERFLOW        (1 << 2)
 
 struct perf_event_header {
         __u32   type;
@@ -230,36 +231,27 @@ enum perf_event_type {
         PERF_EVENT_MUNMAP               = 2,
 
         /*
-         * Half the event type space is reserved for the counter overflow
-         * bitfields, as found in hw_event.record_type.
-         *
-         * These events will have types of the form:
-         *   PERF_EVENT_COUNTER_OVERFLOW { | __PERF_EVENT_* } *
+         * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
+         * will be PERF_RECORD_*
          *
          * struct {
          *      struct perf_event_header        header;
          *
-         *      { u64                   ip;       } && __PERF_EVENT_IP
-         *      { u32                   pid, tid; } && __PERF_EVENT_TID
+         *      { u64                   ip;       } && PERF_RECORD_IP
+         *      { u32                   pid, tid; } && PERF_RECORD_TID
          *
          *      { u64                   nr;
-         *        { u64 event, val; }   cnt[nr];  } && __PERF_EVENT_GROUP
+         *        { u64 event, val; }   cnt[nr];  } && PERF_RECORD_GROUP
          *
          *      { u16                   nr,
          *                              hv,
          *                              kernel,
          *                              user;
-         *        u64                   ips[nr];  } && __PERF_EVENT_CALLCHAIN
+         *        u64                   ips[nr];  } && PERF_RECORD_CALLCHAIN
          *
-         *      { u64                   time;     } && __PERF_EVENT_TIME
+         *      { u64                   time;     } && PERF_RECORD_TIME
          * };
          */
-        PERF_EVENT_COUNTER_OVERFLOW     = 1UL << 31,
-        __PERF_EVENT_IP                 = PERF_RECORD_IP,
-        __PERF_EVENT_TID                = PERF_RECORD_TID,
-        __PERF_EVENT_GROUP              = PERF_RECORD_GROUP,
-        __PERF_EVENT_CALLCHAIN          = PERF_RECORD_CALLCHAIN,
-        __PERF_EVENT_TIME               = PERF_RECORD_TIME,
 };
 
 #ifdef __KERNEL__