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    Subject[PATCH v5 perf, bpf-next 5/7] perf util: handle PERF_RECORD_KSYMBOL
    Date
    This patch handles PERF_RECORD_KSYMBOL in perf record/report.
    Specifically, map and symbol are created for ksymbol register, and
    removed for ksymbol unregister.

    This patch also set perf_event_attr.ksymbol properly. The flag is
    ON by default.

    Signed-off-by: Song Liu <songliubraving@fb.com>
    ---
    tools/perf/util/event.c | 20 ++++++++++++++
    tools/perf/util/event.h | 18 +++++++++++++
    tools/perf/util/evsel.c | 9 +++++++
    tools/perf/util/evsel.h | 1 +
    tools/perf/util/machine.c | 57 +++++++++++++++++++++++++++++++++++++++
    tools/perf/util/machine.h | 5 +++-
    tools/perf/util/session.c | 4 +++
    tools/perf/util/tool.h | 4 ++-
    8 files changed, 116 insertions(+), 2 deletions(-)

    diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
    index e9c108a6b1c3..4b47194eaa4b 100644
    --- a/tools/perf/util/event.c
    +++ b/tools/perf/util/event.c
    @@ -24,6 +24,7 @@
    #include "symbol/kallsyms.h"
    #include "asm/bug.h"
    #include "stat.h"
    +#include "session.h"

    static const char *perf_event__names[] = {
    [0] = "TOTAL",
    @@ -43,6 +44,7 @@ static const char *perf_event__names[] = {
    [PERF_RECORD_SWITCH] = "SWITCH",
    [PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
    [PERF_RECORD_NAMESPACES] = "NAMESPACES",
    + [PERF_RECORD_KSYMBOL] = "KSYMBOL",
    [PERF_RECORD_HEADER_ATTR] = "ATTR",
    [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
    [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
    @@ -1335,6 +1337,14 @@ int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
    return machine__process_switch_event(machine, event);
    }

    +int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
    + union perf_event *event,
    + struct perf_sample *sample __maybe_unused,
    + struct machine *machine)
    +{
    + return machine__process_ksymbol(machine, event, sample);
    +}
    +
    size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
    {
    return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
    @@ -1467,6 +1477,13 @@ static size_t perf_event__fprintf_lost(union perf_event *event, FILE *fp)
    return fprintf(fp, " lost %" PRIu64 "\n", event->lost.lost);
    }

    +size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
    +{
    + return fprintf(fp, " ksymbol event with addr %lx len %lu name %s\n",
    + event->ksymbol_event.addr, event->ksymbol_event.len,
    + event->ksymbol_event.name);
    +}
    +
    size_t perf_event__fprintf(union perf_event *event, FILE *fp)
    {
    size_t ret = fprintf(fp, "PERF_RECORD_%s",
    @@ -1502,6 +1519,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
    case PERF_RECORD_LOST:
    ret += perf_event__fprintf_lost(event, fp);
    break;
    + case PERF_RECORD_KSYMBOL:
    + ret += perf_event__fprintf_ksymbol(event, fp);
    + break;
    default:
    ret += fprintf(fp, "\n");
    }
    diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
    index bfa60bcafbde..100b59f1fdec 100644
    --- a/tools/perf/util/event.h
    +++ b/tools/perf/util/event.h
    @@ -5,6 +5,7 @@
    #include <limits.h>
    #include <stdio.h>
    #include <linux/kernel.h>
    +#include <linux/bpf.h>

    #include "../perf.h"
    #include "build-id.h"
    @@ -84,6 +85,17 @@ struct throttle_event {
    u64 stream_id;
    };

    +#ifndef KSYM_NAME_LEN
    +#define KSYM_NAME_LEN 256
    +#endif
    +
    +struct ksymbol_event {
    + struct perf_event_header header;
    + u64 addr;
    + u64 len;
    + char name[KSYM_NAME_LEN];
    +};
    +
    #define PERF_SAMPLE_MASK \
    (PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
    PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
    @@ -651,6 +663,7 @@ union perf_event {
    struct stat_round_event stat_round;
    struct time_conv_event time_conv;
    struct feature_event feat;
    + struct ksymbol_event ksymbol_event;
    };

    void perf_event__print_totals(void);
    @@ -750,6 +763,10 @@ int perf_event__process_exit(struct perf_tool *tool,
    union perf_event *event,
    struct perf_sample *sample,
    struct machine *machine);
    +int perf_event__process_ksymbol(struct perf_tool *tool,
    + union perf_event *event,
    + struct perf_sample *sample,
    + struct machine *machine);
    int perf_tool__process_synth_event(struct perf_tool *tool,
    union perf_event *event,
    struct machine *machine,
    @@ -814,6 +831,7 @@ size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp);
    size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
    size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
    size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
    +size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
    size_t perf_event__fprintf(union perf_event *event, FILE *fp);

    int kallsyms__get_function_start(const char *kallsyms_filename,
    diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
    index dbc0466db368..de34ce875648 100644
    --- a/tools/perf/util/evsel.c
    +++ b/tools/perf/util/evsel.c
    @@ -1035,6 +1035,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
    attr->mmap = track;
    attr->mmap2 = track && !perf_missing_features.mmap2;
    attr->comm = track;
    + attr->ksymbol = track && !perf_missing_features.ksymbol;

    if (opts->record_namespaces)
    attr->namespaces = track;
    @@ -1652,6 +1653,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
    PRINT_ATTRf(context_switch, p_unsigned);
    PRINT_ATTRf(write_backward, p_unsigned);
    PRINT_ATTRf(namespaces, p_unsigned);
    + PRINT_ATTRf(ksymbol, p_unsigned);

    PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
    PRINT_ATTRf(bp_type, p_unsigned);
    @@ -1811,6 +1813,8 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
    PERF_SAMPLE_BRANCH_NO_CYCLES);
    if (perf_missing_features.group_read && evsel->attr.inherit)
    evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
    + if (perf_missing_features.ksymbol)
    + evsel->attr.ksymbol = 0;
    retry_sample_id:
    if (perf_missing_features.sample_id_all)
    evsel->attr.sample_id_all = 0;
    @@ -1955,6 +1959,11 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
    perf_missing_features.exclude_guest = true;
    pr_debug2("switching off exclude_guest, exclude_host\n");
    goto fallback_missing_features;
    + } else if (!perf_missing_features.ksymbol &&
    + evsel->attr.ksymbol) {
    + perf_missing_features.ksymbol = true;
    + pr_debug2("switching off ksymbol\n");
    + goto fallback_missing_features;
    } else if (!perf_missing_features.sample_id_all) {
    perf_missing_features.sample_id_all = true;
    pr_debug2("switching off sample_id_all\n");
    diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
    index 3147ca76c6fc..c647c1963f7a 100644
    --- a/tools/perf/util/evsel.h
    +++ b/tools/perf/util/evsel.h
    @@ -168,6 +168,7 @@ struct perf_missing_features {
    bool lbr_flags;
    bool write_backward;
    bool group_read;
    + bool ksymbol;
    };

    extern struct perf_missing_features perf_missing_features;
    diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
    index 8f36ce813bc5..5b50442d77c9 100644
    --- a/tools/perf/util/machine.c
    +++ b/tools/perf/util/machine.c
    @@ -681,6 +681,61 @@ int machine__process_switch_event(struct machine *machine __maybe_unused,
    return 0;
    }

    +static int machine__process_ksymbol_register(
    + struct machine *machine,
    + union perf_event *event,
    + struct perf_sample *sample __maybe_unused)
    +{
    + struct symbol *sym;
    + struct map *map;
    +
    + map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
    + if (!map) {
    + map = dso__new_map("bpf_prog");
    + if (!map)
    + return -ENOMEM;
    +
    + map->start = event->ksymbol_event.addr;
    + map->pgoff = map->start;
    + map->end = map->start + event->ksymbol_event.len;
    + map_groups__insert(&machine->kmaps, map);
    + }
    +
    + sym = symbol__new(event->ksymbol_event.addr, event->ksymbol_event.len,
    + 0, 0, event->ksymbol_event.name);
    + if (!sym)
    + return -ENOMEM;
    + dso__insert_symbol(map->dso, sym);
    + return 0;
    +}
    +
    +static int machine__process_ksymbol_unregister(
    + struct machine *machine,
    + union perf_event *event,
    + struct perf_sample *sample __maybe_unused)
    +{
    + struct map *map;
    +
    + map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
    + if (map)
    + map_groups__remove(&machine->kmaps, map);
    +
    + return 0;
    +}
    +
    +int machine__process_ksymbol(struct machine *machine __maybe_unused,
    + union perf_event *event,
    + struct perf_sample *sample)
    +{
    + if (dump_trace)
    + perf_event__fprintf_ksymbol(event, stderr);
    +
    + if (event->header.misc & PERF_RECORD_MISC_KSYMBOL_UNREGISTER)
    + return machine__process_ksymbol_unregister(machine, event,
    + sample);
    + return machine__process_ksymbol_register(machine, event, sample);
    +}
    +
    static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
    {
    const char *dup_filename;
    @@ -1812,6 +1867,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
    case PERF_RECORD_SWITCH:
    case PERF_RECORD_SWITCH_CPU_WIDE:
    ret = machine__process_switch_event(machine, event); break;
    + case PERF_RECORD_KSYMBOL:
    + ret = machine__process_ksymbol(machine, event, sample); break;
    default:
    ret = -1;
    break;
    diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
    index d856b85862e2..e92728fe66cd 100644
    --- a/tools/perf/util/machine.h
    +++ b/tools/perf/util/machine.h
    @@ -127,9 +127,12 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
    struct perf_sample *sample);
    int machine__process_mmap2_event(struct machine *machine, union perf_event *event,
    struct perf_sample *sample);
    +
    int machine__process_event(struct machine *machine, union perf_event *event,
    struct perf_sample *sample);
    -
    +int machine__process_ksymbol(struct machine *machine,
    + union perf_event *event,
    + struct perf_sample *sample);
    typedef void (*machine__process_t)(struct machine *machine, void *data);

    struct machines {
    diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
    index 7d2c8ce6cfad..2c1976a66164 100644
    --- a/tools/perf/util/session.c
    +++ b/tools/perf/util/session.c
    @@ -371,6 +371,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
    tool->itrace_start = perf_event__process_itrace_start;
    if (tool->context_switch == NULL)
    tool->context_switch = perf_event__process_switch;
    + if (tool->ksymbol == NULL)
    + tool->ksymbol = perf_event__process_ksymbol;
    if (tool->read == NULL)
    tool->read = process_event_sample_stub;
    if (tool->throttle == NULL)
    @@ -1300,6 +1302,8 @@ static int machines__deliver_event(struct machines *machines,
    case PERF_RECORD_SWITCH:
    case PERF_RECORD_SWITCH_CPU_WIDE:
    return tool->context_switch(tool, event, sample, machine);
    + case PERF_RECORD_KSYMBOL:
    + return tool->ksymbol(tool, event, sample, machine);
    default:
    ++evlist->stats.nr_unknown_events;
    return -1;
    diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
    index 56e4ca54020a..9c81ca2f3cf7 100644
    --- a/tools/perf/util/tool.h
    +++ b/tools/perf/util/tool.h
    @@ -53,7 +53,9 @@ struct perf_tool {
    itrace_start,
    context_switch,
    throttle,
    - unthrottle;
    + unthrottle,
    + ksymbol;
    +
    event_attr_op attr;
    event_attr_op event_update;
    event_op2 tracing_data;
    --
    2.17.1
    \
     
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      Last update: 2018-12-20 19:31    [W:4.272 / U:0.780 seconds]
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