linux-kernel - [GIT PULL] perfcounters fixes

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Date:	Fri, 4 Sep 2009 10:49:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: [GIT PULL] perfcounters fixes

Linus,

Please pull the latest perfcounters-fixes-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git perfcounters-fixes-for-linus

Would be nice if you could pull this into .31-final, due to the 
security and the stability fix.

 Thanks,

	Ingo

------------------>
Ingo Molnar (1):
      perf_counters: Increase paranoia level

Paul Mackerras (1):
      perf_counter/powerpc: Fix cache event codes for POWER7

Peter Zijlstra (1):
      perf_counter: Fix /0 bug in swcounters


 arch/powerpc/kernel/power7-pmu.c |    6 +++---
 kernel/perf_counter.c            |    3 ++-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/power7-pmu.c b/arch/powerpc/kernel/power7-pmu.c
index 388cf57..018d094 100644
--- a/arch/powerpc/kernel/power7-pmu.c
+++ b/arch/powerpc/kernel/power7-pmu.c
@@ -317,7 +317,7 @@ static int power7_generic_events[] = {
  */
 static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 	[C(L1D)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
-		[C(OP_READ)] = {	0x400f0,	0xc880	},
+		[C(OP_READ)] = {	0xc880,		0x400f0	},
 		[C(OP_WRITE)] = {	0,		0x300f0	},
 		[C(OP_PREFETCH)] = {	0xd8b8,		0	},
 	},
@@ -327,8 +327,8 @@ static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 		[C(OP_PREFETCH)] = {	0x408a,		0	},
 	},
 	[C(LL)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
-		[C(OP_READ)] = {	0x6080,		0x6084	},
-		[C(OP_WRITE)] = {	0x6082,		0x6086	},
+		[C(OP_READ)] = {	0x16080,	0x26080	},
+		[C(OP_WRITE)] = {	0x16082,	0x26082	},
 		[C(OP_PREFETCH)] = {	0,		0	},
 	},
 	[C(DTLB)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index f274e19..d7cbc57 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -50,7 +50,7 @@ static atomic_t nr_task_counters __read_mostly;
  *  1 - disallow cpu counters to unpriv
  *  2 - disallow kernel profiling to unpriv
  */
-int sysctl_perf_counter_paranoid __read_mostly;
+int sysctl_perf_counter_paranoid __read_mostly = 1;
 
 static inline bool perf_paranoid_cpu(void)
 {
@@ -4066,6 +4066,7 @@ perf_counter_alloc(struct perf_counter_attr *attr,
 	hwc->sample_period = attr->sample_period;
 	if (attr->freq && attr->sample_freq)
 		hwc->sample_period = 1;
+	hwc->last_period = hwc->sample_period;
 
 	atomic64_set(&hwc->period_left, hwc->sample_period);
 
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