linux-kernel - Re: [PATCH 1/1] perf augmented_raw_syscalls.bpf: Move 'struct timespec64' to vmlinux.h

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Date: Fri, 2 Feb 2024 18:01:16 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>, Ian Rogers <irogers@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] perf augmented_raw_syscalls.bpf: Move 'struct
 timespec64' to vmlinux.h

On Fri, Feb 2, 2024 at 11:35 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> If we instead decide to generate vmlinux.h from BTF info, it will be
> there:
>
>   $ pahole timespec64
>   struct timespec64 {
>         time64_t                   tv_sec;               /*     0     8 */
>         long int                   tv_nsec;              /*     8     8 */
>
>         /* size: 16, cachelines: 1, members: 2 */
>         /* last cacheline: 16 bytes */
>   };
>
>   $
>
> pahole manages to find it from /sys/kernel/btf/vmlinux, that is
> generated from the kernel types.
>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Link: https://lore.kernel.org/lkml/
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung

> ---
>  .../util/bpf_skel/augmented_raw_syscalls.bpf.c     | 14 +-------------
>  tools/perf/util/bpf_skel/vmlinux/vmlinux.h         |  7 +++++++
>  2 files changed, 8 insertions(+), 13 deletions(-)
>
> diff --git a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
> index baecffbece14fb68..d3b672593c540259 100644
> --- a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
> +++ b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
> @@ -6,6 +6,7 @@
>   * payload expected by the 'perf trace' beautifiers.
>   */
>
> +#include "vmlinux.h"
>  #include <linux/bpf.h>
>  #include <bpf/bpf_helpers.h>
>  #include <linux/limits.h>
> @@ -22,19 +23,6 @@
>
>  #define MAX_CPUS  4096
>
> -// FIXME: These should come from system headers
> -#ifndef bool
> -typedef char bool;
> -#endif
> -typedef int pid_t;
> -typedef long long int __s64;
> -typedef __s64 time64_t;
> -
> -struct timespec64 {
> -       time64_t        tv_sec;
> -       long int        tv_nsec;
> -};
> -
>  /* bpf-output associated map */
>  struct __augmented_syscalls__ {
>         __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
> diff --git a/tools/perf/util/bpf_skel/vmlinux/vmlinux.h b/tools/perf/util/bpf_skel/vmlinux/vmlinux.h
> index ab84a6e1da5eedb3..e9028235d7717b59 100644
> --- a/tools/perf/util/bpf_skel/vmlinux/vmlinux.h
> +++ b/tools/perf/util/bpf_skel/vmlinux/vmlinux.h
> @@ -20,6 +20,13 @@ typedef __s64 s64;
>
>  typedef int pid_t;
>
> +typedef __s64 time64_t;
> +
> +struct timespec64 {
> +        time64_t        tv_sec;
> +        long int        tv_nsec;
> +};
> +
>  enum cgroup_subsys_id {
>         perf_event_cgrp_id  = 8,
>  };
> --
> 2.43.0
>