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From: Andi Kleen <andi@firstfloor.org>
To: linux-kernel@vger.kernel.org
Cc: acme@redhat.com, peterz@infradead.org, jolsa@redhat.com,
	eranian@google.com, mingo@kernel.org, namhyung@kernel.org,
	Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 18/32] perf, x86: Support for printing PMU state on spurious PMIs v3
Date: Tue, 30 Oct 2012 17:34:09 -0700	[thread overview]
Message-ID: <1351643663-23828-19-git-send-email-andi@firstfloor.org> (raw)
In-Reply-To: <1351643663-23828-1-git-send-email-andi@firstfloor.org>

From: Andi Kleen <ak@linux.intel.com>

I had some problems with spurious PMIs, so print the PMU state
on a spurious one. This will not interact well with other NMI users.
Disabled by default, has to be explicitely enabled through sysfs.

Optional, but useful for debugging.

v2: Move to /sys/devices/cpu
v3: Print in more cases
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 arch/x86/kernel/cpu/perf_event.c       |    3 +++
 arch/x86/kernel/cpu/perf_event.h       |    2 ++
 arch/x86/kernel/cpu/perf_event_intel.c |   11 ++++++-----
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index ec3c549..57bb4ce 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -38,6 +38,7 @@
 #include "perf_event.h"
 
 struct x86_pmu x86_pmu __read_mostly;
+int	       print_spurious_pmi __read_mostly;
 
 DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = {
 	.enabled = 1,
@@ -1758,9 +1759,11 @@ static ssize_t set_attr_rdpmc(struct device *cdev,
 }
 
 static DEVICE_ATTR(rdpmc, S_IRUSR | S_IWUSR, get_attr_rdpmc, set_attr_rdpmc);
+static DEVICE_INT_ATTR(print_spurious_pmi, 0644, print_spurious_pmi);
 
 static struct attribute *x86_pmu_attrs[] = {
 	&dev_attr_rdpmc.attr,
+	&dev_attr_print_spurious_pmi.attr.attr,
 	NULL,
 };
 
diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
index d55e502..2ef5b20 100644
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -664,3 +664,5 @@ static inline struct intel_shared_regs *allocate_shared_regs(int cpu)
 }
 
 #endif /* CONFIG_CPU_SUP_INTEL */
+
+extern int print_spurious_pmi;
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 20caf0a..dc2f2a1 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -1146,11 +1146,8 @@ static int intel_pmu_handle_irq(struct pt_regs *regs)
 	intel_pmu_disable_all();
 	handled = intel_pmu_drain_bts_buffer();
 	status = intel_pmu_get_status();
-	if (!status) {
-		intel_pmu_enable_all(0);
-		return handled;
-	}
-
+	if (!status)
+		goto done;
 	loops = 0;
 again:
 	intel_pmu_ack_status(status);
@@ -1210,6 +1207,10 @@ again:
 		goto again;
 
 done:
+	if (!handled && print_spurious_pmi) {
+		pr_debug("Spurious PMI\n");
+		perf_event_print_debug();
+	}
 	intel_pmu_enable_all(0);
 	return handled;
 }
-- 
1.7.7.6


  parent reply	other threads:[~2012-10-31  0:39 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-31  0:33 perf PMU support for Haswell v5 Andi Kleen
2012-10-31  0:33 ` [PATCH 01/32] perf, x86: Add PEBSv2 record support Andi Kleen
2012-10-31  0:33 ` [PATCH 02/32] perf, x86: Basic Haswell PMU support v2 Andi Kleen
2012-10-31  0:33 ` [PATCH 03/32] perf, x86: Basic Haswell PEBS support v3 Andi Kleen
2012-10-31  0:33 ` [PATCH 04/32] perf, x86: Support the TSX intx/intx_cp qualifiers v2 Andi Kleen
2012-10-31  0:33 ` [PATCH 05/32] perf, kvm: Support the intx/intx_cp modifiers in KVM arch perfmon emulation v3 Andi Kleen
2012-10-31 10:27   ` Gleb Natapov
2012-10-31 10:32     ` Andi Kleen
2012-10-31 10:38       ` Gleb Natapov
2012-10-31 16:43         ` Andi Kleen
2012-11-01 16:50   ` Andi Kleen
2012-10-31  0:33 ` [PATCH 06/32] perf, x86: Support PERF_SAMPLE_ADDR on Haswell Andi Kleen
2012-10-31  0:33 ` [PATCH 07/32] perf, x86: Support Haswell v4 LBR format Andi Kleen
2012-10-31  0:33 ` [PATCH 08/32] perf, x86: Disable LBR recording for unknown LBR_FMT Andi Kleen
2012-10-31  0:34 ` [PATCH 09/32] perf, x86: Support LBR filtering by INTX/NOTX/ABORT v2 Andi Kleen
2012-10-31  0:34 ` [PATCH 10/32] perf, tools: Add abort_tx,no_tx,in_tx branch filter options to perf record -j v3 Andi Kleen
2012-10-31  0:34 ` [PATCH 11/32] perf, tools: Support sorting by intx, abort branch flags Andi Kleen
2012-10-31  0:34 ` [PATCH 12/32] perf, x86: Support full width counting Andi Kleen
2012-10-31  0:34 ` [PATCH 13/32] perf, x86: Avoid checkpointed counters causing excessive TSX aborts v3 Andi Kleen
2012-10-31  0:34 ` [PATCH 14/32] perf, core: Add a concept of a weightened sample Andi Kleen
2012-10-31  0:34 ` [PATCH 15/32] perf, x86: Support weight samples for PEBS Andi Kleen
2012-10-31  0:34 ` [PATCH 16/32] perf, tools: Add support for weight v3 Andi Kleen
2012-10-31  0:34 ` [PATCH 17/32] perf, tools: Handle XBEGIN like a jump Andi Kleen
2012-11-14  6:35   ` [tip:perf/core] perf annotate: " tip-bot for Andi Kleen
2012-10-31  0:34 ` Andi Kleen [this message]
2012-10-31  0:34 ` [PATCH 19/32] perf, core: Add generic transaction flags v2 Andi Kleen
2012-10-31  0:34 ` [PATCH 20/32] perf, x86: Add Haswell specific transaction flag reporting Andi Kleen
2012-10-31  0:34 ` [PATCH 21/32] perf, tools: Add support for record transaction flags v2 Andi Kleen
2012-10-31  0:34 ` [PATCH 22/32] perf, tools: Point --sort documentation to --help Andi Kleen
2012-10-31  0:34 ` [PATCH 23/32] perf, tools: Add browser support for transaction flags v2 Andi Kleen
2012-10-31  9:02   ` [PATCH] perf, tools: Fix WERROR=1 build with transction flags and fix browser Andi Kleen
2012-10-31  0:34 ` [PATCH 24/32] perf, tools: Add arbitary aliases and support names with - Andi Kleen
2012-10-31  0:34 ` [PATCH 25/32] tools, perf: Add a precise event qualifier Andi Kleen
2012-10-31  0:34 ` [PATCH 26/32] perf, x86: improve sysfs event mapping with event string Andi Kleen
2012-10-31  0:34 ` [PATCH 27/32] perf, x86: Support CPU specific sysfs events Andi Kleen
2012-11-07 14:41   ` Stephane Eranian
2012-10-31  0:34 ` [PATCH 28/32] perf, x86: Add Haswell TSX event aliases v2 Andi Kleen
2012-10-31  0:34 ` [PATCH 29/32] perf, tools: Add perf stat --transaction v2 Andi Kleen
2012-10-31  0:34 ` [PATCH 30/32] perf, x86: Add a Haswell precise instructions event v2 Andi Kleen
2012-10-31  0:34 ` [PATCH 31/32] perf, tools: Default to cpu// for events v3 Andi Kleen
2012-10-31  0:34 ` [PATCH 32/32] perf, tools: List kernel supplied event aliases in perf list v2 Andi Kleen
2012-11-10  1:27 perf PMU support for Haswell v6 Andi Kleen
2012-11-10  1:27 ` [PATCH 18/32] perf, x86: Support for printing PMU state on spurious PMIs v3 Andi Kleen

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