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Intel PT uses the time members from the perf_event_mmap_page to convert between TSC and perf time. Due to a lack of foresight when Intel PT was implemented, those time members were recorded in the (implementation dependent) AUXTRACE_INFO event, the structure of which is generally inaccessible outside of the Intel PT decoder. However now the conversion between TSC and perf time is needed when processing a jitdump file when Intel PT has been used for tracing. So add a user event to record the time members. 'perf record' will synthesize the event if the information is available. And session processing will put a copy of the event on the session so that tools like 'perf inject' can easily access it. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1457426324-30158-1-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
23 lines
502 B
C
23 lines
502 B
C
#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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#include "../arch/x86/util/tsc.h"
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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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struct perf_event_mmap_page;
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struct perf_tool;
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struct machine;
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int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc,
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struct perf_tool *tool,
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perf_event__handler_t process,
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struct machine *machine);
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#endif
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