e60b7cb089
All the information required by the PERF_SAMPLE_WEIGHT is available in the pebs record. Thus large PEBS could be enabled for PERF_SAMPLE_WEIGHT sample type to save PMIs overhead until other non-compatible flags such as PERF_SAMPLE_DATA_PAGE_SIZE (due to lack of munmap tracking) stop it. To cover new weight extension, add PERF_SAMPLE_WEIGHT_TYPE to the guardian LARGE_PEBS_FLAGS. Tested it with: $ perf mem record -c 1000 workload Before: Captured and wrote 0.126 MB perf.data (958 samples) [958 PMIs] After: Captured and wrote 0.313 MB perf.data (4859 samples) [3 PMIs] Reported-by: Yongchao Duan <yongduan@tencent.com> Signed-off-by: Like Xu <likexu@tencent.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20220519151913.80545-1-likexu@tencent.com |
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|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 Restructured Text 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.