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Subject[PATCH 5/5] perf top: check the latency of perf_top__mmap_read
Date
From: Kan Liang <kan.liang@intel.com>

The latency of perf_top__mmap_read should be lower than refresh time.
If not, give some hints to reduce the latency.

Signed-off-by: Kan Liang <kan.liang@intel.com>
---
tools/perf/builtin-top.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 721d786..f36936c 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -872,13 +872,23 @@ static void perf_top__mmap_read_idx(struct perf_top *top, int idx)

static void perf_top__mmap_read(struct perf_top *top)
{
+ unsigned long long start, end;
int i;

+ start = rdclock();
perf_evlist__toggle_bkw_mmap(top->evlist, BKW_MMAP_DATA_PENDING);
for (i = 0; i < top->evlist->nr_mmaps; i++)
perf_top__mmap_read_idx(top, i);
perf_evlist__toggle_bkw_mmap(top->evlist, BKW_MMAP_EMPTY);
perf_evlist__toggle_bkw_mmap(top->evlist, BKW_MMAP_RUNNING);
+ end = rdclock();
+
+ if ((end - start) > (unsigned long long)top->delay_secs * NSEC_PER_SEC)
+ ui__warning("Too slow to read ring buffer.\n"
+ "Please try increasing the period (-c) or\n"
+ "decreasing the freq (-F) or\n"
+ "limiting the number of CPUs (-C)\n");
+
}

static int perf_top__start_counters(struct perf_top *top)
--
2.5.5
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