perf_counter: frequency based adaptive irq_period
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>
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index e543ecc..004b6e1 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -130,7 +130,11 @@
*/
__u64 config;
- __u64 irq_period;
+ union {
+ __u64 irq_period;
+ __u64 irq_freq;
+ };
+
__u32 record_type;
__u32 read_format;
@@ -146,8 +150,9 @@
mmap : 1, /* include mmap data */
munmap : 1, /* include munmap data */
comm : 1, /* include comm data */
+ freq : 1, /* use freq, not period */
- __reserved_1 : 52;
+ __reserved_1 : 51;
__u32 extra_config_len;
__u32 wakeup_events; /* wakeup every n events */
@@ -337,6 +342,7 @@
atomic64_t prev_count;
u64 irq_period;
atomic64_t period_left;
+ u64 interrupts;
#endif
};