[tip:perf/core] perf/x86: Dump DEBUGCTL in PMU dump

From: tip-bot for Andi Kleen
Date: Thu Apr 02 2015 - 14:46:00 EST

Commit-ID: da3e606d885a17525eb18afd423f5c438860b833
Gitweb: http://git.kernel.org/tip/da3e606d885a17525eb18afd423f5c438860b833
Author: Andi Kleen <ak@xxxxxxxxxxxxxxx>
AuthorDate: Fri, 27 Feb 2015 09:48:31 -0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 2 Apr 2015 17:33:17 +0200

perf/x86: Dump DEBUGCTL in PMU dump

LBRs and LBR freezing are controlled through the DEBUGCTL MSR. So
dump the state of DEBUGCTL too when dumping the PMU state.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: eranian@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1425059312-18217-3-git-send-email-andi@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
arch/x86/kernel/cpu/perf_event.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index b8b7a12..9947372 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1171,7 +1171,7 @@ static void x86_pmu_start(struct perf_event *event, int flags)
void perf_event_print_debug(void)
u64 ctrl, status, overflow, pmc_ctrl, pmc_count, prev_left, fixed;
- u64 pebs;
+ u64 pebs, debugctl;
struct cpu_hw_events *cpuc;
unsigned long flags;
int cpu, idx;
@@ -1197,6 +1197,10 @@ void perf_event_print_debug(void)
pr_info("CPU#%d: overflow: %016llx\n", cpu, overflow);
pr_info("CPU#%d: fixed: %016llx\n", cpu, fixed);
pr_info("CPU#%d: pebs: %016llx\n", cpu, pebs);
+ if (x86_pmu.lbr_nr) {
+ rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl);
+ pr_info("CPU#%d: debugctl: %016llx\n", cpu, debugctl);
+ }
pr_info("CPU#%d: active: %016llx\n", cpu, *(u64 *)cpuc->active_mask);

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