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author | Pekka Paalanen <pq@iki.fi> | 2008-05-12 21:21:02 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-24 11:27:08 +0200 |
commit | 2039238b79b51a50f8477f53f33750e1c3fc146a (patch) | |
tree | 4ce2cf80d840b1846c416e376e0e8391f8f3c0f6 | |
parent | d0a7e8ca5b996d36219e6fc002907291c8ee677b (diff) | |
download | op-kernel-dev-2039238b79b51a50f8477f53f33750e1c3fc146a.zip op-kernel-dev-2039238b79b51a50f8477f53f33750e1c3fc146a.tar.gz |
mmiotrace: print overrun counts
Signed-off-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r-- | kernel/trace/trace_mmiotrace.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c index 6d2edbd..d0f649a 100644 --- a/kernel/trace/trace_mmiotrace.c +++ b/kernel/trace/trace_mmiotrace.c @@ -17,11 +17,13 @@ struct header_iter { }; static struct trace_array *mmio_trace_array; +static bool overrun_detected; static void mmio_reset_data(struct trace_array *tr) { int cpu; + overrun_detected = false; tr->time_start = ftrace_now(tr->cpu); for_each_online_cpu(cpu) @@ -124,12 +126,34 @@ static void mmio_close(struct trace_iterator *iter) iter->private = NULL; } +static unsigned long count_overruns(struct trace_iterator *iter) +{ + int cpu; + unsigned long cnt = 0; + for_each_online_cpu(cpu) { + cnt += iter->overrun[cpu]; + iter->overrun[cpu] = 0; + } + return cnt; +} + static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { ssize_t ret; struct header_iter *hiter = iter->private; struct trace_seq *s = &iter->seq; + unsigned long n; + + n = count_overruns(iter); + if (n) { + /* XXX: This is later than where events were lost. */ + trace_seq_printf(s, "MARK 0.000000 Lost %lu events.\n", n); + if (!overrun_detected) + pr_warning("mmiotrace has lost events.\n"); + overrun_detected = true; + goto print_out; + } if (!hiter) return 0; @@ -142,6 +166,7 @@ static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp, iter->private = NULL; } +print_out: ret = trace_seq_to_user(s, ubuf, cnt); return (ret == -EBUSY) ? 0 : ret; } |