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Subject[PATCH v5 4/4] perf report: Documentation average IPC and IPC coverage
Date
Add explanations for new columns "IPC" and "IPC coverage" in perf
documentation.

v5:
---
Update the description according to Ingo's comments.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
---
tools/perf/Documentation/perf-report.txt | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 474a494..ed2bf37 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -126,6 +126,14 @@ OPTIONS
And default sort keys are changed to comm, dso_from, symbol_from, dso_to
and symbol_to, see '--branch-stack'.

+ When the sort key symbol is specified, columns "IPC" and "IPC Coverage"
+ are enabled automatically. Column "IPC" reports the average IPC per function
+ and column "IPC coverage" reports the percentage of instructions with
+ sampled IPC in this function. IPC means Instruction Per Cycle. If it's low,
+ it indicates there may be a performance bottleneck when the function is
+ executed, such as a memory access bottleneck. If a function has high overhead
+ and low IPC, it's worth further analyzing it to optimize its performance.
+
If the --mem-mode option is used, the following sort keys are also available
(incompatible with --branch-stack):
symbol_daddr, dso_daddr, locked, tlb, mem, snoop, dcacheline.
--
2.7.4
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