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performance counters: x86 support

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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>
This commit is contained in:
Ingo Molnar
2008-12-03 10:39:53 +01:00
parent e7bc62b6b3
commit 241771ef01
21 changed files with 652 additions and 21 deletions
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7
arch/x86/kernel/signal.c
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@@ -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 */