04-24-2012
How do you want it to "touch" only 10%, on what criteria?
In the simplest way,you would need to count how many, and compute to get 10%, then use a counter to get out of the loop
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LEARN ABOUT CENTOS
libpfm_intel_core
LIBPFM(3) Linux Programmer's Manual LIBPFM(3)
NAME
libpfm_intel_core - support for Intel Core-based processors
SYNOPSIS
#include <perfmon/pfmlib.h>
PMU name: core
PMU desc: Intel Core
DESCRIPTION
The library supports all Intel Core-based processors that includes models 15, 23, 29.
MODIFIERS
The following modifiers are supported on Intel Core processors:
u Measure at user level which includes privilege levels 1, 2, 3. This corresponds to PFM_PLM3. This is a boolean modifier.
k Measure at kernel level which includes privilege level 0. This corresponds to PFM_PLM0. This is a boolean modifier.
i Invert the meaning of the event. The counter will now count cycles in which the event is not occurring. This is a boolean modifier
e Enable edge detection, i.e., count only when there is a state transition from no occurrence of the event to at least one occurrence.
This modifier must be combined with a counter mask modifier (m) with a value greater or equal to one. This is a boolean modifier.
c Set the counter mask value. The mask acts as a threshold. The counter will count the number of cycles in which the number of occur-
rences of the event is greater or equal to the threshold. This is an integer modifier with values in the range [0:255].
AUTHORS
Stephane Eranian <eranian@gmail.com>
September, 2009 LIBPFM(3)