top.c

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/*
 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Refactored from builtin-top.c, see that files for further copyright notes.
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */

#include "cpumap.h"
#include "event.h"
#include "evlist.h"
#include "evsel.h"
#include "parse-events.h"
#include "symbol.h"
#include "top.h"
#include <inttypes.h>

#define SNPRINTF(buf, size, fmt, args...) \
({ \
    size_t r = snprintf(buf, size, fmt, ## args); \
    r > size ?  size : r; \
})

size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size)
{
    float samples_per_sec;
    float ksamples_per_sec;
    float esamples_percent;
    struct record_opts *opts = &top->record_opts;
    struct target *target = &opts->target;
    size_t ret = 0;

    if (top->samples) {
        samples_per_sec = top->samples / top->delay_secs;
        ksamples_per_sec = top->kernel_samples / top->delay_secs;
        esamples_percent = (100.0 * top->exact_samples) / top->samples;
    } else {
        samples_per_sec = ksamples_per_sec = esamples_percent = 0.0;
    }

    if (!perf_guest) {
        float ksamples_percent = 0.0;

        if (samples_per_sec)
            ksamples_percent = (100.0 * ksamples_per_sec) /
                            samples_per_sec;
        ret = SNPRINTF(bf, size,
                   "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%%"
                   "  exact: %4.1f%% [", samples_per_sec,
                   ksamples_percent, esamples_percent);
    } else {
        float us_samples_per_sec = top->us_samples / top->delay_secs;
        float guest_kernel_samples_per_sec = top->guest_kernel_samples / top->delay_secs;
        float guest_us_samples_per_sec = top->guest_us_samples / top->delay_secs;

        ret = SNPRINTF(bf, size,
                   "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%% us:%4.1f%%"
                   " guest kernel:%4.1f%% guest us:%4.1f%%"
                   " exact: %4.1f%% [", samples_per_sec,
                   100.0 - (100.0 * ((samples_per_sec - ksamples_per_sec) /
                         samples_per_sec)),
                   100.0 - (100.0 * ((samples_per_sec - us_samples_per_sec) /
                         samples_per_sec)),
                   100.0 - (100.0 * ((samples_per_sec -
                          guest_kernel_samples_per_sec) /
                         samples_per_sec)),
                   100.0 - (100.0 * ((samples_per_sec -
                          guest_us_samples_per_sec) /
                         samples_per_sec)),
                   esamples_percent);
    }

    if (top->evlist->nr_entries == 1) {
        struct perf_evsel *first = perf_evlist__first(top->evlist);
        ret += SNPRINTF(bf + ret, size - ret, "%" PRIu64 "%s ",
                (uint64_t)first->attr.sample_period,
                opts->freq ? "Hz" : "");
    }

    ret += SNPRINTF(bf + ret, size - ret, "%s", perf_evsel__name(top->sym_evsel));

    ret += SNPRINTF(bf + ret, size - ret, "], ");

    if (target->pid)
        ret += SNPRINTF(bf + ret, size - ret, " (target_pid: %s",
                target->pid);
    else if (target->tid)
        ret += SNPRINTF(bf + ret, size - ret, " (target_tid: %s",
                target->tid);
    else if (target->uid_str != NULL)
        ret += SNPRINTF(bf + ret, size - ret, " (uid: %s",
                target->uid_str);
    else
        ret += SNPRINTF(bf + ret, size - ret, " (all");

    if (target->cpu_list)
        ret += SNPRINTF(bf + ret, size - ret, ", CPU%s: %s)",
                top->evlist->cpus->nr > 1 ? "s" : "",
                target->cpu_list);
    else {
        if (target->tid)
            ret += SNPRINTF(bf + ret, size - ret, ")");
        else
            ret += SNPRINTF(bf + ret, size - ret, ", %d CPU%s)",
                    top->evlist->cpus->nr,
                    top->evlist->cpus->nr > 1 ? "s" : "");
    }

    return ret;
}

void perf_top__reset_sample_counters(struct perf_top *top)
{
    top->samples = top->us_samples = top->kernel_samples =
    top->exact_samples = top->guest_kernel_samples =
    top->guest_us_samples = 0;
}