* [PATCH 1/2] perf: replace irq_period with union in design document
@ 2009-12-28 11:20 Tim Blechmann
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From: Tim Blechmann @ 2009-12-28 11:20 UTC (permalink / raw)
To: linux-kernel
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perf_event_attr.irq_period has been renamed to sample_period/sample_freq.
the design document was still using the old name, though.
Signed-off-by: Tim Blechmann <tim@klingt.org>
---
tools/perf/design.txt | 12 ++++++++----
1 files changed, 8 insertions(+), 4 deletions(-)
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diff --git a/tools/perf/design.txt b/tools/perf/design.txt
index a58cc9a..d68515f 100644
--- a/tools/perf/design.txt
+++ b/tools/perf/design.txt
@@ -43,7 +43,11 @@ struct perf_event_attr {
*/
__u64 config;
- __u64 irq_period;
+ union {
+ __u64 sample_period;
+ __u64 sample_freq;
+ };
+
__u32 record_type;
__u32 read_format;
@@ -147,7 +151,7 @@ tracer is available, and event_id values can be obtained from
Counters come in two flavours: counting counters and sampling
counters. A "counting" counter is one that is used for counting the
number of events that occur, and is characterised by having
-irq_period = 0.
+sample_period = 0.
A read() on a counter returns the current value of the counter and possible
@@ -170,8 +174,8 @@ into account.
A "sampling" counter is one that is set up to generate an interrupt
-every N events, where N is given by 'irq_period'. A sampling counter
-has irq_period > 0. The record_type controls what data is recorded on each
+every N events, where N is given by 'sample_period'. A sampling counter
+has sample_period > 0. The record_type controls what data is recorded on each
interrupt:
/*
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2009-12-28 11:20 [PATCH 1/2] perf: replace irq_period with union in design document Tim Blechmann
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