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The --total-cycles may output wrong information with the --stdio.
For example:
# perf record -e "{cycles,instructions}",cache-misses -b sleep 1
# perf report --total-cycles --stdio
The total cycles output of {cycles,instructions} and cache-misses are
almost the same.
# Samples: 938 of events 'anon group { cycles, instructions }'
# Event count (approx.): 938
#
# Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles [Program Block Range]
# ............... .............. ........... .......... ..................................................>
#
11.19% 2.6K 0.10% 21 [perf_iterate_ctx+48 -> >
5.79% 1.4K 0.45% 97 [__intel_pmu_enable_all.constprop.0+80 -> __intel_>
5.11% 1.2K 0.33% 71 [native_write_msr+0 ->>
# Samples: 293 of event 'cache-misses'
# Event count (approx.): 293
#
# Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles [Program Block Range]
# ............... .............. ........... .......... ..................................................>
#
11.19% 2.6K 0.13% 21 [perf_iterate_ctx+48 -> >
5.79% 1.4K 0.59% 97 [__intel_pmu_enable_all.constprop.0+80 -> __intel_>
5.11% 1.2K 0.43% 71 [native_write_msr+0 ->>
With the symbol_conf.event_group, the 'perf report' should only report the
block information of the leader event in a group.
However, the current implementation retrieves the next event's block
information, rather than the next group leader's block information.
Make sure the index is updated even if the event is skipped.
With the patch,
# Samples: 293 of event 'cache-misses'
# Event count (approx.): 293
#
# Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles [Program Block Range]
# ............... .............. ........... .......... ..................................................>
#
37.98% 9.0K 4.05% 299 [perf_event_addr_filters_exec+0 -> perf_event_a>
11.19% 2.6K 0.28% 21 [perf_iterate_ctx+48 -> >
5.79% 1.4K 1.32% 97 [__intel_pmu_enable_all.constprop.0+80 -> __intel_>
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.