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    Subject[PATCH 09/44] perf session: Add instruction tracing options
    Date
    It is assumed that AUX area decoding will
    synthesize events for consumption by other tools.
    At this time, the main use of AUX area tracing will be
    to capture instruction trace (aka processor trace) data.
    The nature of instruction tracing suggests the
    initial inclusion of options for "instructions"
    and "branches" events, but more could be added
    as needed.

    Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
    ---
    tools/perf/util/auxtrace.c | 131 +++++++++++++++++++++++++++++++++++++++++++++
    tools/perf/util/auxtrace.h | 43 +++++++++++++++
    tools/perf/util/session.h | 2 +
    3 files changed, 176 insertions(+)

    diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
    index 2cafea2..1bec3e6 100644
    --- a/tools/perf/util/auxtrace.c
    +++ b/tools/perf/util/auxtrace.c
    @@ -37,6 +37,7 @@

    #include "event.h"
    #include "debug.h"
    +#include "parse-options.h"

    int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
    struct auxtrace_mmap_params *mp,
    @@ -200,6 +201,136 @@ out_free:
    return err;
    }

    +#define PERF_ITRACE_DEFAULT_PERIOD_TYPE PERF_ITRACE_PERIOD_NANOSECS
    +#define PERF_ITRACE_DEFAULT_PERIOD 100000
    +#define PERF_ITRACE_DEFAULT_CALLCHAIN_SZ 16
    +#define PERF_ITRACE_MAX_CALLCHAIN_SZ 1024
    +
    +void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts)
    +{
    + synth_opts->instructions = true;
    + synth_opts->branches = true;
    + synth_opts->errors = true;
    + synth_opts->period_type = PERF_ITRACE_DEFAULT_PERIOD_TYPE;
    + synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
    + synth_opts->callchain_sz = PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
    +}
    +
    +int itrace_parse_synth_opts(const struct option *opt, const char *str,
    + int unset)
    +{
    + struct itrace_synth_opts *synth_opts = opt->value;
    + const char *p;
    + char *endptr;
    +
    + synth_opts->set = true;
    +
    + if (unset) {
    + synth_opts->dont_decode = true;
    + return 0;
    + }
    +
    + if (!str) {
    + itrace_synth_opts__set_default(synth_opts);
    + return 0;
    + }
    +
    + for (p = str; *p;) {
    + switch (*p++) {
    + case 'i':
    + synth_opts->instructions = true;
    + while (*p == ' ' || *p == ',')
    + p += 1;
    + if (isdigit(*p)) {
    + synth_opts->period = strtoull(p, &endptr, 10);
    + p = endptr;
    + while (*p == ' ' || *p == ',')
    + p += 1;
    + switch (*p++) {
    + case 'i':
    + synth_opts->period_type =
    + PERF_ITRACE_PERIOD_INSTRUCTIONS;
    + break;
    + case 't':
    + synth_opts->period_type =
    + PERF_ITRACE_PERIOD_TICKS;
    + break;
    + case 'm':
    + synth_opts->period *= 1000;
    + /* Fall through */
    + case 'u':
    + synth_opts->period *= 1000;
    + /* Fall through */
    + case 'n':
    + if (*p++ != 's')
    + goto out_err;
    + synth_opts->period_type =
    + PERF_ITRACE_PERIOD_NANOSECS;
    + break;
    + case '\0':
    + goto out;
    + default:
    + goto out_err;
    + }
    + }
    + break;
    + case 'b':
    + synth_opts->branches = true;
    + break;
    + case 'e':
    + synth_opts->errors = true;
    + break;
    + case 'd':
    + synth_opts->log = true;
    + break;
    + case 'c':
    + synth_opts->branches = true;
    + synth_opts->calls = true;
    + break;
    + case 'r':
    + synth_opts->branches = true;
    + synth_opts->returns = true;
    + break;
    + case 'g':
    + synth_opts->instructions = true;
    + synth_opts->callchain = true;
    + synth_opts->callchain_sz =
    + PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
    + while (*p == ' ' || *p == ',')
    + p += 1;
    + if (isdigit(*p)) {
    + unsigned int val;
    +
    + val = strtoul(p, &endptr, 10);
    + p = endptr;
    + if (!val || val > PERF_ITRACE_MAX_CALLCHAIN_SZ)
    + goto out_err;
    + synth_opts->callchain_sz = val;
    + }
    + break;
    + case ' ':
    + case ',':
    + break;
    + default:
    + goto out_err;
    + }
    + }
    +out:
    + if (synth_opts->instructions) {
    + if (!synth_opts->period_type)
    + synth_opts->period_type =
    + PERF_ITRACE_DEFAULT_PERIOD_TYPE;
    + if (!synth_opts->period)
    + synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
    + }
    +
    + return 0;
    +
    +out_err:
    + pr_err("Bad Instruction Tracing options '%s'\n", str);
    + return -EINVAL;
    +}
    +
    int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr,
    struct perf_tool *tool, process_auxtrace_t fn)
    {
    diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
    index 199fc27..6355315 100644
    --- a/tools/perf/util/auxtrace.h
    +++ b/tools/perf/util/auxtrace.h
    @@ -29,9 +29,49 @@ union perf_event;
    struct perf_session;
    struct perf_evlist;
    struct perf_tool;
    +struct option;
    struct record_opts;
    struct auxtrace_info_event;

    +enum itrace_period_type {
    + PERF_ITRACE_PERIOD_INSTRUCTIONS,
    + PERF_ITRACE_PERIOD_TICKS,
    + PERF_ITRACE_PERIOD_NANOSECS,
    +};
    +
    +/**
    + * struct itrace_synth_opts - AUX area tracing synthesis options.
    + * @set: indicates whether or not options have been set
    + * @inject: indicates the event (not just the sample) must be fully synthesized
    + * because 'perf inject' will write it out
    + * @instructions: whether to synthesize 'instructions' events
    + * @branches: whether to synthesize 'branches' events
    + * @errors: whether to synthesize decoder error events
    + * @dont_decode: whether to skip decoding entirely
    + * @log: write a decoding log
    + * @calls: limit branch samples to calls (can be combined with @returns)
    + * @returns: limit branch samples to returns (can be combined with @calls)
    + * @callchain: add callchain to 'instructions' events
    + * @callchain_sz: maximum callchain size
    + * @period: 'instructions' events period
    + * @period_type: 'instructions' events period type
    + */
    +struct itrace_synth_opts {
    + bool set;
    + bool inject;
    + bool instructions;
    + bool branches;
    + bool errors;
    + bool dont_decode;
    + bool log;
    + bool calls;
    + bool returns;
    + bool callchain;
    + unsigned int callchain_sz;
    + unsigned long long period;
    + enum itrace_period_type period_type;
    +};
    +
    /**
    * struct auxtrace - session callbacks to allow AUX area data decoding.
    * @process_event: lets the decoder see all session events
    @@ -186,6 +226,9 @@ int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
    struct perf_tool *tool,
    struct perf_session *session,
    perf_event__handler_t process);
    +int itrace_parse_synth_opts(const struct option *opt, const char *str,
    + int unset);
    +void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts);

    static inline int auxtrace__process_event(struct perf_session *session,
    union perf_event *event,
    diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
    index 8a69d3b..9ed5135 100644
    --- a/tools/perf/util/session.h
    +++ b/tools/perf/util/session.h
    @@ -16,12 +16,14 @@ struct ip_callchain;
    struct thread;

    struct auxtrace;
    +struct itrace_synth_opts;

    struct perf_session {
    struct perf_header header;
    struct machines machines;
    struct perf_evlist *evlist;
    struct auxtrace *auxtrace;
    + struct itrace_synth_opts *itrace_synth_opts;
    struct trace_event tevent;
    bool repipe;
    bool one_mmap;
    --
    1.9.1


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