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49c0ae80eb
Stephane reported that we don't set properly PERIOD sample type for events with period term defined. Before: $ perf record -e cpu/cpu-cycles,period=1000/u ls $ perf evlist -v cpu/cpu-cycles,period=1000/u: ... sample_type: IP|TID|TIME|PERIOD, ... After: $ perf record -e cpu/cpu-cycles,period=1000/u ls $ perf evlist -v cpu/cpu-cycles,period=1000/u: ... sample_type: IP|TID|TIME, ... Setting PERIOD sample type based on period term setup. Committer note: When we use -c or a period=N term in the event definition, then we don't need to ask the kernel, for this event, via perf_event_attr.sample_type |= PERF_SAMPLE_PERIOD, to put the event period in each sample for this event, as we know it already, it is in perf_event_attr.sample_period. Reported-by: Stephane Eranian <eranian@google.com> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Stephane Eranian <eranian@google.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20180201083812.11359-2-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.