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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2011-06-22 16:24:09 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-06-22 16:24:20 +0200 |
| commit | 6815823431296082fa20c2f14007e194424660b8 (patch) | |
| tree | 98bc558b3ce9c4f044a0fc5a3f99d6da86e7b895 /arch/s390 | |
| parent | b530ce7a1af5a9355be518557d86b33c6d2cf088 (diff) | |
| download | op-kernel-dev-6815823431296082fa20c2f14007e194424660b8.zip op-kernel-dev-6815823431296082fa20c2f14007e194424660b8.tar.gz | |
[S390] hwsampler: Set a sane default sampling rate
The sampling interval for the hardware sampler is specified in cycles.
(see SA23-2260-01 The Load-Program-Parameter and the CPU-Measurement
Facilities)
The current default value will therefore result in millions of samples.
This patch changes the default sampling interval to 4M, which will
result in ~1500 samples per second on a z196 reducing the overhead
of sampling.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/oprofile/init.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/oprofile/init.c b/arch/s390/oprofile/init.c index 5e2ab03..0e358c2 100644 --- a/arch/s390/oprofile/init.c +++ b/arch/s390/oprofile/init.c @@ -25,7 +25,7 @@ extern void s390_backtrace(struct pt_regs * const regs, unsigned int depth); #include "hwsampler.h" -#define DEFAULT_INTERVAL 4096 +#define DEFAULT_INTERVAL 4127518 #define DEFAULT_SDBT_BLOCKS 1 #define DEFAULT_SDB_BLOCKS 511 |
