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AUX area data is not processed by 'perf record' and consequently the --timestamp-boundary option may result in no values for "time of first sample" and "time of last sample". However there are non-sample events that can be used instead, namely 'itrace_start' and 'aux'. 'itrace_start' is issued before tracing starts, and 'aux' is issued every time data is ready. Implement tool callbacks for those two for 'perf record', to update the timestamp boundary. Example: $ perf record -e intel_pt//u --timestamp-boundary uname Linux [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.022 MB perf.data ] $ perf script --header-only | grep "time of" # time of first sample : 4574.835541 # time of last sample : 4574.835907 $ perf script --itrace=be -F-ip | head -1 uname 13752 [001] 4574.835589: 1 branches:uH: $ perf script --itrace=be -F-ip | tail -1 uname 13752 [001] 4574.835867: 1 branches:uH: $ Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lore.kernel.org/lkml/20210503064222.5319-1-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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certs | ||
crypto | ||
Documentation | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
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mm | ||
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sound | ||
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usr | ||
virt | ||
.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.