Re: [PATCH] perf: ftrace: flush output after each writing

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Sat, May 13, 2023 at 03:40:00PM +0800, Changbin Du escreveu:
> The pager will result stdout in full buffering mode instead of line
> buffering. We need to make the trace visible timely.

Thanks, applied.

- Arnaldo

 
> Signed-off-by: Changbin Du <changbin.du@huawei.com>
> ---
>  tools/perf/builtin-ftrace.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
> index 810e3376c7d6..ad2a9ae041f6 100644
> --- a/tools/perf/builtin-ftrace.c
> +++ b/tools/perf/builtin-ftrace.c
> @@ -650,6 +650,8 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace)
>  				break;
>  			if (fwrite(buf, n, 1, stdout) != 1)
>  				break;
> +			/* flush output since stdout is in full buffering mode due to pager */
> +			fflush(stdout);
>  		}
>  	}
>  
> -- 
> 2.25.1
> 

-- 

- Arnaldo