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Commit ce5c1fe9 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf/x86: Fix USER/KERNEL tagging of samples 



Several perf interrupt handlers (PEBS,IBS,BTS) re-write regs->ip but
do not update the segment registers. So use an regs->ip based test
instead of an regs->cs/regs->flags based test.

Reported-and-tested-by: default avatarStephane Eranian <eranian@google.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/n/tip-xxrt0a1zronm1sm36obwc2vy@git.kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 9e85a6f9

arch/x86/kernel/cpu/perf_event.c

+1 −1
Original line number Diff line number Diff line
@@ -1863,7 +1863,7 @@ unsigned long perf_misc_flags(struct pt_regs *regs) 
		else

			misc |= PERF_RECORD_MISC_GUEST_KERNEL;

	} else {

		if (user_mode(regs))

		if (!kernel_ip(regs->ip))

			misc |= PERF_RECORD_MISC_USER;

		else

			misc |= PERF_RECORD_MISC_KERNEL;