From 632448f65001c4935ed0d3bb362017d773da2eca Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 14 Nov 2008 18:18:04 +0100 Subject: [PATCH] [S390] ftrace: disable tracing on idle psw Disable tracing on idle psw. Otherwise it would give us huge preempt off times for idle. Which is rather pointless. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index 3e2c05cb6a87..04f8c67a6101 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -136,9 +136,12 @@ static void default_idle(void) return; } trace_hardirqs_on(); + /* Don't trace preempt off for idle. */ + stop_critical_timings(); /* Wait for external, I/O or machine check interrupt. */ __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | PSW_MASK_IO | PSW_MASK_EXT); + start_critical_timings(); } void cpu_idle(void) -- 2.30.2