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authorRafael J. Wysocki <rjw@sisk.pl>2009-09-14 20:26:05 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2009-09-14 20:26:05 +0200
commitac8d513a6801c8636922ccf4f30211810c9a56ce (patch)
tree83ba584487a6a612c8fcf2563c28c0263df35ba2 /arch/x86/include/asm/perf_counter.h
parentbf992fa2bc1ad1bb2aeb0bdfadb43f236b9297fd (diff)
parent99bc47067910f7070e65ee318a6dd79a2371f1e5 (diff)
Merge branch 'master' into for-linus
Diffstat (limited to 'arch/x86/include/asm/perf_counter.h')
-rw-r--r--arch/x86/include/asm/perf_counter.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/include/asm/perf_counter.h b/arch/x86/include/asm/perf_counter.h
index fa64e401589..e7b7c938ae2 100644
--- a/arch/x86/include/asm/perf_counter.h
+++ b/arch/x86/include/asm/perf_counter.h
@@ -84,6 +84,16 @@ union cpuid10_edx {
#define MSR_ARCH_PERFMON_FIXED_CTR2 0x30b
#define X86_PMC_IDX_FIXED_BUS_CYCLES (X86_PMC_IDX_FIXED + 2)
+/*
+ * We model BTS tracing as another fixed-mode PMC.
+ *
+ * We choose a value in the middle of the fixed counter range, since lower
+ * values are used by actual fixed counters and higher values are used
+ * to indicate other overflow conditions in the PERF_GLOBAL_STATUS msr.
+ */
+#define X86_PMC_IDX_FIXED_BTS (X86_PMC_IDX_FIXED + 16)
+
+
#ifdef CONFIG_PERF_COUNTERS
extern void init_hw_perf_counters(void);
extern void perf_counters_lapic_init(void);