perf_counter: add more context information

Change the callchain context entries to u16, so as to gain some space.

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: <20090406094517.457320003@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index e22ab47a2f41..f9d5cf0bfbdd 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -507,10 +507,10 @@ extern void perf_counter_mmap(unsigned long addr, unsigned long len,
 extern void perf_counter_munmap(unsigned long addr, unsigned long len,
                                 unsigned long pgoff, struct file *file);
 
-#define MAX_STACK_DEPTH         254
+#define MAX_STACK_DEPTH         255
 
 struct perf_callchain_entry {
-        u32     nr, hv, kernel, user;
+        u16     nr, hv, kernel, user;
         u64     ip[MAX_STACK_DEPTH];
 };