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SubjectRe: [PATCH] perf script: print cgroup on the same line as comm
On Mon, Jul 17, 2023 at 5:07 PM Ivan Babrou <ivan@cloudflare.com> wrote:
>
> Commit 3fd7a168bf51 ("perf script: Add 'cgroup' field for output")
> added support for printing cgroup path in perf script output.
>
> It was okay if you didn't want any stacks:
>
> $ sudo perf script --comms jpegtran:23f4bf -F comm,tid,cpu,time,cgroup
> jpegtran:23f4bf 3321915 [013] 404718.587488: /idle.slice/polish.service
> jpegtran:23f4bf 3321915 [031] 404718.592073: /idle.slice/polish.service
>
> With stacks it gets messier as cgroup is printed after the stack:
>
> $ perf script --comms jpegtran:23f4bf -F comm,tid,cpu,time,cgroup,ip,sym
> jpegtran:23f4bf 3321915 [013] 404718.587488:
> 5c554 compress_output
> 570d9 jpeg_finish_compress
> 3476e jpegtran_main
> 330ee jpegtran::main
> 326e2 core::ops::function::FnOnce::call_once (inlined)
> 326e2 std::sys_common::backtrace::__rust_begin_short_backtrace
> /idle.slice/polish.service
> jpegtran:23f4bf 3321915 [031] 404718.592073:
> 8474d jsimd_encode_mcu_AC_first_prepare_sse2.PADDING
> 55af68e62fff [unknown]
> /idle.slice/polish.service
>
> Let's instead print cgroup on the same line as comm:
>
> $ perf script --comms jpegtran:23f4bf -F comm,tid,cpu,time,cgroup,ip,sym
> jpegtran:23f4bf 3321915 [013] 404718.587488: /idle.slice/polish.service
> 5c554 compress_output
> 570d9 jpeg_finish_compress
> 3476e jpegtran_main
> 330ee jpegtran::main
> 326e2 core::ops::function::FnOnce::call_once (inlined)
> 326e2 std::sys_common::backtrace::__rust_begin_short_backtrace
>
> jpegtran:23f4bf 3321915 [031] 404718.592073: /idle.slice/polish.service
> 8474d jsimd_encode_mcu_AC_first_prepare_sse2.PADDING
> 55af68e62fff [unknown]
>
> Signed-off-by: Ivan Babrou <ivan@cloudflare.com>
> Fixes: 3fd7a168bf51 ("perf script: Add 'cgroup' field for output")
> ---
> tools/perf/builtin-script.c | 22 +++++++++++-----------
> 1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 200b3e7ea8da..517bf25750c8 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -2199,6 +2199,17 @@ static void process_event(struct perf_script *script,
> if (PRINT_FIELD(RETIRE_LAT))
> fprintf(fp, "%16" PRIu16, sample->retire_lat);
>
> + if (PRINT_FIELD(CGROUP)) {
> + const char *cgrp_name;
> + struct cgroup *cgrp = cgroup__find(machine->env,
> + sample->cgroup);
> + if (cgrp != NULL)
> + cgrp_name = cgrp->name;
> + else
> + cgrp_name = "unknown";
> + fprintf(fp, " %s", cgrp_name);
> + }
> +
> if (PRINT_FIELD(IP)) {
> struct callchain_cursor *cursor = NULL;
>
> @@ -2243,17 +2254,6 @@ static void process_event(struct perf_script *script,
> if (PRINT_FIELD(CODE_PAGE_SIZE))
> fprintf(fp, " %s", get_page_size_name(sample->code_page_size, str));
>
> - if (PRINT_FIELD(CGROUP)) {
> - const char *cgrp_name;
> - struct cgroup *cgrp = cgroup__find(machine->env,
> - sample->cgroup);
> - if (cgrp != NULL)
> - cgrp_name = cgrp->name;
> - else
> - cgrp_name = "unknown";
> - fprintf(fp, " %s", cgrp_name);
> - }
> -
> perf_sample__fprintf_ipc(sample, attr, fp);
>
> fprintf(fp, "\n");
> --
> 2.41.0
>

A friendly bump in case this slipped through the cracks.

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