3bd5a5fc8c
The test uses the newly added cap_usr_time_zero and time_zero of perf_event_mmap_page. TSC from rdtsc is compared with the time from 2 perf events. The test passes if the calculated times are all in the correct order. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/1372425741-1676-4-git-send-email-adrian.hunter@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
21 lines
508 B
C
21 lines
508 B
C
#ifndef TOOLS_PERF_ARCH_X86_UTIL_TSC_H__
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#define TOOLS_PERF_ARCH_X86_UTIL_TSC_H__
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#include "../../util/types.h"
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struct perf_tsc_conversion {
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u16 time_shift;
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u32 time_mult;
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u64 time_zero;
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};
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struct perf_event_mmap_page;
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int perf_read_tsc_conversion(const struct perf_event_mmap_page *pc,
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struct perf_tsc_conversion *tc);
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u64 perf_time_to_tsc(u64 ns, struct perf_tsc_conversion *tc);
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u64 tsc_to_perf_time(u64 cyc, struct perf_tsc_conversion *tc);
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#endif /* TOOLS_PERF_ARCH_X86_UTIL_TSC_H__ */
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