Messages in this thread |  | | From | Jin Yao <> | Subject | [PATCH v4 0/6] perf report: Show branch flags/cycles in --branch-history callgraph view | Date | Mon, 31 Oct 2016 09:19:48 +0800 |
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v4: Update according to Andi's comments. The requirement is not displaying the number of removed loops. It needs to display the average number of iterations. It computes out the number of iterations by counting the removed loops.
v3: 1. Display the count for tsx abort, remove the abort percentage.
2. Since the branch history code has a loop detection that removes small loops in util/machine.c:remove_loops(). It would be nice to note how many loops were removed. So it adds the note on some callchain entries.
v2: Just a rebase to Arnaldo's perf/core branch, no functional changes.
Initial post
perf record -g -b ... perf report --branch-history
Currently it only shows the branches from the LBR in the callgraph view. It would be useful to annotate branch predictions and TSX aborts and also timed LBR cycles also in the callgraph view.
This would allow a quick overview where branch predictions are and how costly basic blocks are.
For example:
# Overhead Source:Line Symbol Shared Object Predicted Abort Cycles # ........ ........................... ........................... ................. ......... ..... ...... # 38.25% div.c:45 [.] main div 97.6% 0 3 | ---main div.c:42 (cycles:2) compute_flag div.c:28 (cycles:2) compute_flag div.c:27 (cycles:1) rand rand.c:28 (cycles:1) rand rand.c:28 (cycles:1) __random random.c:298 (cycles:1) __random random.c:297 (cycles:1) __random random.c:295 (cycles:1) __random random.c:295 (cycles:1) __random random.c:295 (cycles:1) __random random.c:295 (cycles:9) | |--36.73%--__random_r random_r.c:392 (cycles:9) | __random_r random_r.c:357 (cycles:1) | __random random.c:293 (cycles:1) | __random random.c:293 (cycles:1) | __random random.c:291 (cycles:1) | __random random.c:291 (cycles:1) | __random random.c:291 (cycles:1) | __random random.c:288 (cycles:1) | rand rand.c:27 (cycles:1) | rand rand.c:26 (cycles:1) | rand@plt +4194304 (cycles:1) | rand@plt +4194304 (cycles:1) | compute_flag div.c:25 (cycles:1) | compute_flag div.c:22 (cycles:1) | main div.c:40 (cycles:1) | main div.c:40 (cycles:16) | main div.c:39 (cycles:16) | | | |--29.93%--main div.c:39 (predicted:50.6%, cycles:1, iterations:18) | | main div.c:44 (predicted:50.6%, cycles:1) | | | | | --22.69%--main div.c:42 (cycles:2, iterations:17) | | compute_flag div.c:28 (cycles:2) | | | | | --10.52%--compute_flag div.c:27 (cycles:1) | | rand rand.c:28 (cycles:1)
Jin Yao (6): perf report: Add branch flag to callchain cursor node perf report: Create a symbol_conf flag for showing branch flag counting perf report: Caculate and return the branch flag counting perf report: Show branch info in callchain entry for stdio mode perf report: Show branch info in callchain entry for browser mode perf report: Display columns Predicted/Abort/Cycles in --branch-history
tools/perf/Documentation/perf-report.txt | 9 ++ tools/perf/builtin-report.c | 9 +- tools/perf/ui/browsers/hists.c | 20 ++- tools/perf/ui/stdio/hist.c | 35 +++++- tools/perf/util/callchain.c | 203 ++++++++++++++++++++++++++++++- tools/perf/util/callchain.h | 22 +++- tools/perf/util/hist.c | 3 + tools/perf/util/hist.h | 3 + tools/perf/util/machine.c | 82 ++++++++++--- tools/perf/util/sort.c | 113 ++++++++++++++++- tools/perf/util/sort.h | 3 + tools/perf/util/symbol.h | 1 + 12 files changed, 476 insertions(+), 27 deletions(-)
-- 2.7.4
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