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[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>
This commit is contained in:
Christian Borntraeger 2011-06-22 16:24:09 +02:00 committed by Martin Schwidefsky
parent b530ce7a1a
commit 6815823431
1 changed files with 1 additions and 1 deletions
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2
arch/s390/oprofile/init.c
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@ -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