perf_counter: frequency based adaptive irq_period

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Instead of specifying the irq_period for a counter, provide a target interrupt
frequency and dynamically adapt the irq_period to match this frequency.

[ Impact: new perf-counter attribute/feature ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20090515132018.646195868@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

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Peter Zijlstra 2009-05-15 15:19:28 +02:00 • committed by Ingo Molnar

parent 789f90fcf6

commit 60db5e09c1

4 changed files with 68 additions and 27 deletions

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13

arch/powerpc/kernel/perf_counter.c

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9

arch/x86/kernel/cpu/perf_counter.c

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10

include/linux/perf_counter.h

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63

kernel/perf_counter.c

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