Commit-ID: eb58157b92bfdddc5257f9a170edd3db96e96748 Gitweb: https://git.kernel.org/tip/eb58157b92bfdddc5257f9a170edd3db96e96748 Author: Jin Yao <yao....@linux.intel.com> AuthorDate: Fri, 30 Nov 2018 21:54:57 +0800 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Fri, 30 Nov 2018 17:14:52 -0300
perf report: Documentation average IPC and IPC coverage 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....@linux.intel.com> Reviewed-by: Ingo Molnar <mi...@kernel.org> Reviewed-by: Jiri Olsa <jo...@kernel.org> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Andi Kleen <a...@linux.intel.com> Cc: Kan Liang <kan.li...@linux.intel.com> Cc: Peter Zijlstra <pet...@infradead.org> Link: http://lkml.kernel.org/r/1543586097-27632-5-git-send-email-yao....@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- 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 474a4941f65d..ed2bf37ab132 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.
