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bc2373a58a
The TSC frequency information is required for the event metrics with the literal, system_tsc_freq. For the newer Intel platform, the TSC frequency information can be retrieved from the CPUID leaf 0x15. If the TSC frequency information isn't present the /proc/cpuinfo approach is used. Refactor cpuid() for this use. Note, the previous stack pushing/popping approach was broken on x86-64 that has stack red zones that would be clobbered. Committer testing: Before: $ perf record sleep 0.0001 [ perf record: Woken up 1 times to write data ] $ perf report --header-only |& grep cpuid # cpuid : AuthenticAMD,25,33,0 $ After the patch: $ perf record sleep 0.0001 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.002 MB perf.data (8 samples) ] $ perf report --header-only |& grep cpuid # cpuid : AuthenticAMD,25,33,0 $ Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexandre Torgue <alexandre.torgue@foss.st.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Caleb Biggers <caleb.biggers@intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.garry@huawei.com> Cc: Kshipra Bopardikar <kshipra.bopardikar@intel.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Perry Taylor <perry.taylor@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Link: https://lore.kernel.org/r/20220718164312.3994191-2-irogers@google.com Signed-off-by: Ian Rogers <irogers@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
32 lines
710 B
C
32 lines
710 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_TSC_H
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#define __PERF_TSC_H
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#include <linux/types.h>
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#include "event.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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u64 time_cycles;
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u64 time_mask;
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bool cap_user_time_zero;
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bool cap_user_time_short;
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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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u64 rdtsc(void);
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double arch_get_tsc_freq(void);
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size_t perf_event__fprintf_time_conv(union perf_event *event, FILE *fp);
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#endif // __PERF_TSC_H
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