forked from luck/tmp_suning_uos_patched
x86, mmiotrace: fix buffer overrun detection
Impact: fix mmiotrace overrun tracing
When ftrace framework moved to use the ring buffer facility, the buffer
overrun detection was broken after 2.6.27 by commit
| commit 3928a8a2d9
| Author: Steven Rostedt <rostedt@goodmis.org>
| Date: Mon Sep 29 23:02:41 2008 -0400
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| ftrace: make work with new ring buffer
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| This patch ports ftrace over to the new ring buffer.
The detection is now fixed by using the ring buffer API.
When mmiotrace detects a buffer overrun, it will report the number of
lost events. People reading an mmiotrace log must know if something was
missed, otherwise the data may not make sense.
Signed-off-by: Pekka Paalanen <pq@iki.fi>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
parent
522a110b42
commit
7ee1768ddb
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@ -18,12 +18,14 @@ struct header_iter {
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static struct trace_array *mmio_trace_array;
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static bool overrun_detected;
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static unsigned long prev_overruns;
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static void mmio_reset_data(struct trace_array *tr)
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{
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int cpu;
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overrun_detected = false;
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prev_overruns = 0;
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tr->time_start = ftrace_now(tr->cpu);
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for_each_online_cpu(cpu)
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@ -128,16 +130,12 @@ static void mmio_close(struct trace_iterator *iter)
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static unsigned long count_overruns(struct trace_iterator *iter)
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{
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int cpu;
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unsigned long cnt = 0;
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/* FIXME: */
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#if 0
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for_each_online_cpu(cpu) {
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cnt += iter->overrun[cpu];
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iter->overrun[cpu] = 0;
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}
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#endif
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(void)cpu;
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unsigned long over = ring_buffer_overruns(iter->tr->buffer);
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if (over > prev_overruns)
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cnt = over - prev_overruns;
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prev_overruns = over;
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return cnt;
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}
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