From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 23 Jun 2009 15:55:18 +0000 (+0200)
Subject: perf_counter: Split the mmap control page in two parts
X-Git-Tag: v2.6.31-rc2~30^2~25
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=41f95331b972a039f519ae0c70f051b7121f7346;p=platform%2Fkernel%2Flinux-3.10.git

perf_counter: Split the mmap control page in two parts

Since there are two distinct sections to the control page,
move them apart so that possible extentions don't overlap.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index e7213e4..489d5cb 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -233,6 +233,12 @@ struct perf_counter_mmap_page {
 	__u32	index;			/* hardware counter identifier */
 	__s64	offset;			/* add to hardware counter value */
 
+		/*
+		 * Hole for extension of the self monitor capabilities
+		 */
+
+	__u64	__reserved[125];	/* align to 1k */
+
 	/*
 	 * Control data for the mmap() data buffer.
 	 *