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The number of hardware counters is limited. The multiplexing feature enables OProfile to gather more events than counters are provided by the hardware. This is realized by switching between events at an user specified time interval. A new file (/dev/oprofile/time_slice) is added for the user to specify the timer interval in ms. If the number of events to profile is higher than the number of hardware counters available, the patch will schedule a work queue that switches the event counter and re-writes the different sets of values into it. The switching mechanism needs to be implemented for each architecture to support multiplexing. This patch only implements AMD CPU support, but multiplexing can be easily extended for other models and architectures. There are follow-on patches that rework parts of this patch. Signed-off-by: Jason Yeh <jason.yeh@amd.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
30 lines
510 B
C
30 lines
510 B
C
/**
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* @file op_counter.h
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*
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* @remark Copyright 2002 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon
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*/
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#ifndef OP_COUNTER_H
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#define OP_COUNTER_H
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#define OP_MAX_COUNTER 32
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/* Per-perfctr configuration as set via
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* oprofilefs.
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*/
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struct op_counter_config {
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unsigned long count;
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unsigned long enabled;
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unsigned long event;
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unsigned long kernel;
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unsigned long user;
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unsigned long unit_mask;
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};
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extern struct op_counter_config counter_config[];
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#endif /* OP_COUNTER_H */
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