[tip:perfcounters/urgent] perf_counter: Split the mmap control page in two parts

[tip-bot for Peter Zijlstra]

Commit-ID:  41f95331b972a039f519ae0c70f051b7121f7346
Gitweb:     http://git.kernel.org/tip/41f95331b972a039f519ae0c70f051b7121f7346
Author:     Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Tue, 23 Jun 2009 17:55:18 +0200
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 25 Jun 2009 21:39:05 +0200

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@xxxxxxxxx>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 include/linux/perf_counter.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

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.
 	 *
--
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