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
