Re: [PATCH] perf stat: Fix endless wait for child process
From: Arnaldo Carvalho de Melo
Date: Thu Jan 03 2019 - 07:44:18 EST
Em Thu, Jan 03, 2019 at 12:12:05PM +0100, Jiri Olsa escreveu:
> On Thu, Jan 03, 2019 at 03:40:45PM +0800, Jin Yao wrote:
> > We hit a perf stat issue by using following script.
> > #!/bin/bash
> > sleep 1000 &
> > exec perf stat -a -e cycles -I1000 -- sleep 5
> > Since "perf stat" is launched by exec, so the "sleep 1000" would be
> > the child process of "perf stat". The wait4() will not return because
> > it's waiting for the child process "sleep 1000" to be end. So perf
> > stat doesn't return even 5s passed.
> > This patch lets the perf stat return when the specified child process
> > is end (in this case, specified child process is "sleep 5").
> > Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
> Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Thanks, tested and applied.