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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e9024d519d
When processing using 'perf report -g caller', which is the default, we ended up reverting the callchain entries received from the kernel, but simply reverting throws away the information that tells that from a point onwards the addresses are for userspace, kernel, guest kernel, guest user, hypervisor. The idea is that if we are walking backwards, for each cluster of non-cpumode entries we have to first scan backwards for the next one and use that for the cluster. This seems silly and more expensive than it needs to be but it is enough for a initial fix. The code here is really complicated because it is intimately intertwined with the lbr and branch handling, as well as this callchain order, further fixes will be needed to properly take into account the cpumode in those cases. Another problem with ORDER_CALLER is that the NULL "0" IP that is at the end of most callchains shows up at the top of the histogram because every callchain contains it and with ORDER_CALLER it is the first entry. Signed-off-by: David S. Miller <davem@davemloft.net> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Souvik Banerjee <souvik1997@gmail.com> Cc: Wang Nan <wangnan0@huawei.com> Cc: stable@vger.kernel.org # 4.19 Link: https://lkml.kernel.org/n/tip-2wt3ayp6j2y2f2xowixa8y6y@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
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| net | ||
| samples | ||
| scripts | ||
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| sound | ||
| tools | ||
| usr | ||
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| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| 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.