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author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-11-14 12:18:04 -0500 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-11-14 12:18:53 -0500 |
commit | 632448f65001c4935ed0d3bb362017d773da2eca (patch) | |
tree | d1daf415fecdc1b9e353e3ad82e30c555961d325 | |
parent | af4c68740e848019d8d14c52704ed8eacceddac6 (diff) |
[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 <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r-- | arch/s390/kernel/process.c | 3 |
1 files changed, 3 insertions, 0 deletions
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) | |||
136 | return; | 136 | return; |
137 | } | 137 | } |
138 | trace_hardirqs_on(); | 138 | trace_hardirqs_on(); |
139 | /* Don't trace preempt off for idle. */ | ||
140 | stop_critical_timings(); | ||
139 | /* Wait for external, I/O or machine check interrupt. */ | 141 | /* Wait for external, I/O or machine check interrupt. */ |
140 | __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | | 142 | __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | |
141 | PSW_MASK_IO | PSW_MASK_EXT); | 143 | PSW_MASK_IO | PSW_MASK_EXT); |
144 | start_critical_timings(); | ||
142 | } | 145 | } |
143 | 146 | ||
144 | void cpu_idle(void) | 147 | void cpu_idle(void) |