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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-11-14 20:18:04 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-11-14 20:18:53 +0300 |
| commit | 632448f65001c4935ed0d3bb362017d773da2eca (patch) | |
| tree | d1daf415fecdc1b9e353e3ad82e30c555961d325 | |
| parent | af4c68740e848019d8d14c52704ed8eacceddac6 (diff) | |
| download | linux-632448f65001c4935ed0d3bb362017d773da2eca.tar.xz | |
[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) 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) |