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authorIngo Molnar <mingo@elte.hu>2008-12-03 10:39:53 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-08 15:47:15 +0100
commit241771ef016b5c0c83cd7a4372a74321c973c1e6 (patch)
tree5893d72f1721af34daee82f27449bd35c9f65363 /arch/x86/kernel/signal.c
parente7bc62b6b3aeaa8849f8383e0cfb7ca6c003adc6 (diff)
performance counters: x86 support
Implement performance counters for x86 Intel CPUs. It's simplified right now: the PERFMON CPU feature is assumed, which is available in Core2 and later Intel CPUs. The design is flexible to be extended to more CPU types as well. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/signal.c')
-rw-r--r--arch/x86/kernel/signal.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index b1cc6da6420..dee553c503d 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -6,7 +6,7 @@
* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
* 2000-2002 x86-64 support by Andi Kleen
*/
-
+#include <linux/perf_counter.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
@@ -891,6 +891,11 @@ do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
tracehook_notify_resume(regs);
}
+ if (thread_info_flags & _TIF_PERF_COUNTERS) {
+ clear_thread_flag(TIF_PERF_COUNTERS);
+ perf_counter_notify(regs);
+ }
+
#ifdef CONFIG_X86_32
clear_thread_flag(TIF_IRET);
#endif /* CONFIG_X86_32 */