[PATCH 1/2] perf: replace irq_period with union in design document

[Tim Blechmann <tim@klingt.org>]

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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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