perf_counter: Add fork event

Create a fork event so that we can easily clone the comm and
dso maps without having to generate all those events.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 37d5541d74cb..380247bdb918 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -277,6 +277,14 @@ enum perf_event_type {
         PERF_EVENT_UNTHROTTLE           = 6,
 
         /*
+         * struct {
+         *      struct perf_event_header        header;
+         *      u32                             pid, ppid;
+         * };
+         */
+        PERF_EVENT_FORK                 = 7,
+
+        /*
          * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
          * will be PERF_RECORD_*
          *
@@ -618,6 +626,7 @@ extern void perf_counter_munmap(unsigned long addr, unsigned long len,
                                 unsigned long pgoff, struct file *file);
 
 extern void perf_counter_comm(struct task_struct *tsk);
+extern void perf_counter_fork(struct task_struct *tsk);
 
 extern void perf_counter_task_migration(struct task_struct *task, int cpu);
 
@@ -673,6 +682,7 @@ perf_counter_munmap(unsigned long addr, unsigned long len,
                     unsigned long pgoff, struct file *file)             { }
 
 static inline void perf_counter_comm(struct task_struct *tsk)           { }
+static inline void perf_counter_fork(struct task_struct *tsk)           { }
 static inline void perf_counter_init(void)                              { }
 static inline void perf_counter_task_migration(struct task_struct *task,
                                                int cpu)                 { }