linux-kernel - Re: [PATCH 15/35] perf script: Add machine

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Date:   Tue, 19 Jul 2022 17:39:12 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 15/35] perf script: Add machine_pid and vcpu

On Mon, Jul 11, 2022 at 2:33 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> Add fields machine_pid and vcpu. These are displayed only if machine_pid is
> non-zero.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/Documentation/perf-script.txt |  7 ++++++-
>  tools/perf/builtin-script.c              | 11 +++++++++++
>  2 files changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
> index e250ff5566cf..c09cc44e50ee 100644
> --- a/tools/perf/Documentation/perf-script.txt
> +++ b/tools/perf/Documentation/perf-script.txt
> @@ -133,7 +133,8 @@ OPTIONS
>          comm, tid, pid, time, cpu, event, trace, ip, sym, dso, addr, symoff,
>          srcline, period, iregs, uregs, brstack, brstacksym, flags, bpf-output,
>          brstackinsn, brstackinsnlen, brstackoff, callindent, insn, insnlen, synth,
> -        phys_addr, metric, misc, srccode, ipc, data_page_size, code_page_size, ins_lat.
> +        phys_addr, metric, misc, srccode, ipc, data_page_size, code_page_size, ins_lat,
> +        machine_pid, vcpu.
>          Field list can be prepended with the type, trace, sw or hw,
>          to indicate to which event type the field list applies.
>          e.g., -F sw:comm,tid,time,ip,sym  and -F trace:time,cpu,trace
> @@ -226,6 +227,10 @@ OPTIONS
>         The ipc (instructions per cycle) field is synthesized and may have a value when
>         Instruction Trace decoding.
>
> +       The machine_pid and vcpu fields are derived from data resulting from using
> +       perf insert to insert a perf.data file recorded inside a virtual machine into

Presumably 'perf inject' ?

Thanks,
Ian

> +       a perf.data file recorded on the host at the same time.
> +
>         Finally, a user may not set fields to none for all event types.
>         i.e., -F "" is not allowed.
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 4b00a50faf00..ac19fee62d8e 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -125,6 +125,8 @@ enum perf_output_field {
>         PERF_OUTPUT_CODE_PAGE_SIZE  = 1ULL << 34,
>         PERF_OUTPUT_INS_LAT         = 1ULL << 35,
>         PERF_OUTPUT_BRSTACKINSNLEN  = 1ULL << 36,
> +       PERF_OUTPUT_MACHINE_PID     = 1ULL << 37,
> +       PERF_OUTPUT_VCPU            = 1ULL << 38,
>  };
>
>  struct perf_script {
> @@ -193,6 +195,8 @@ struct output_option {
>         {.str = "code_page_size", .field = PERF_OUTPUT_CODE_PAGE_SIZE},
>         {.str = "ins_lat", .field = PERF_OUTPUT_INS_LAT},
>         {.str = "brstackinsnlen", .field = PERF_OUTPUT_BRSTACKINSNLEN},
> +       {.str = "machine_pid", .field = PERF_OUTPUT_MACHINE_PID},
> +       {.str = "vcpu", .field = PERF_OUTPUT_VCPU},
>  };
>
>  enum {
> @@ -746,6 +750,13 @@ static int perf_sample__fprintf_start(struct perf_script *script,
>         int printed = 0;
>         char tstr[128];
>
> +       if (PRINT_FIELD(MACHINE_PID) && sample->machine_pid)
> +               printed += fprintf(fp, "VM:%5d ", sample->machine_pid);
> +
> +       /* Print VCPU only for guest events i.e. with machine_pid */
> +       if (PRINT_FIELD(VCPU) && sample->machine_pid)
> +               printed += fprintf(fp, "VCPU:%03d ", sample->vcpu);
> +
>         if (PRINT_FIELD(COMM)) {
>                 const char *comm = thread ? thread__comm_str(thread) : ":-1";
>
> --
> 2.25.1
>