Messages in this thread | | | Date | Thu, 11 Feb 2021 23:52:02 +0100 | From | Jiri Olsa <> | Subject | Re: [PATCH 06/24] perf daemon: Add config file support |
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On Thu, Feb 11, 2021 at 02:10:48PM -0300, Arnaldo Carvalho de Melo wrote: > Em Thu, Feb 11, 2021 at 05:45:38PM +0100, Jiri Olsa escreveu: > > On Thu, Feb 11, 2021 at 03:01:12PM +0900, Namhyung Kim wrote: > > > Hi Jiri, > > > > > > On Tue, Feb 9, 2021 at 5:09 AM Jiri Olsa <jolsa@kernel.org> wrote: > > > > +static int daemon__reconfig(struct daemon *daemon) > > > > +{ > > > > + struct daemon_session *session, *n; > > > > + > > > > + list_for_each_entry_safe(session, n, &daemon->sessions, list) { > > > > + /* No change. */ > > > > + if (session->state == OK) > > > > + continue; > > > > + > > > > + /* Remove session. */ > > > > + if (session->state == KILL) { > > > > + if (session->pid > 0) { > > > > + daemon_session__kill(session); > > > > + pr_info("reconfig: session '%s' killed\n", session->name); > > > > + } > > > > + daemon_session__remove(session); > > > > + continue; > > > > + } > > > > + > > > > + /* Reconfig session. */ > > > > + if (session->pid > 0) { > > > > + daemon_session__kill(session); > > > > + pr_info("reconfig: session '%s' killed\n", session->name); > > > > + } > > > > + if (daemon_session__run(session, daemon)) > > > > + return -1; > > > > > > Shouldn't it be 'continue'? If there's a problematic session > > > it'll prevent others from being processed. And it seems this > > > code will try to run it again and again. Maybe we can put it > > > in the KILL state (or a new FAILED state) IMHO. > > > > so if there is misconfigured session, it will get executed, > > and then we catch that it exited, like: > > > > # ./perf daemon start -f > > [2021-02-11 17:38:19.718166] daemon started (pid 1167439) > > [2021-02-11 17:38:19.719757] reconfig: ruining session [cycles:1167440]: abc -m 10M -e cycles --overwrite --switch-output -a > > [2021-02-11 17:38:19.720861] reconfig: ruining session [sched:1167441]: -m 20M -e sched:* --overwrite --switch-output -a > > [2021-02-11 17:38:21.132511] session 'cycles' exited, status=255 > > > > session will be removed > > > > when the config is fixed and updated, daemon will pick it up: > > > > [2021-02-11 17:42:59.241140] reconfig: ruining session [cycles:1167642]: -m 10M -e cycles --overwrite --switch-output -a > > > > > > daemon_session__run fails only there's no memory for allocation, > > if mkdir fails (for other error than EEXIST) and if fork fails, > > so pretty serious errors, where we want to bail out anyway > > I know you love documentation, that is why I think that it would be a > good idea to have these questions and answers in a FAQ for 'perf > daemon', don't you think? ;-)
heh, sure.. I can add something like that as section to perf-daemon man page
jirka
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