linux-kernel - Re: Seeking Linux watchdog design advice to trouble shoot mystory silent reboot issue

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Date:	Sat, 17 Dec 2011 14:50:29 -0800
From:	Vincent Li <vincent.mc.li@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Seeking Linux watchdog design advice to trouble shoot mystory
 silent reboot issue

On Wed, Dec 14, 2011 at 2:11 PM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Mon, Dec 5, 2011 at 8:55 PM, Vincent Li <vincent.mc.li@...il.com> wrote:
>
>> we have  a complex system with a large number of processes running
>> simutanously. If any of the processes gets into a faulty state and
>> hangs or consumes more than its fair share of the system resources,
>> the other processes may not get a chance to run, and the whole system
>> can hang, interrupting the system functionality and user traffic.
>
> Have you tried using RLIMITs?
>
> Last time I used something like this from each process:
>
> #include <sys/time.h>
> #include <sys/resource.h>
>
> struct rlimit rl;
> int ret;
>
> // No process run more than 5 seconds
> rl.rlim_cur = rl.rlim_max = 5;
> ret = setrlimit(RLIMIT_CPU, &rl);
> // No realtime process run more than 1 second
> rl.rlim_cur = rl.rlim_max = 1000000;
> ret = setrlimit(RLIMIT_RTTIME, &rl);
>
> The latter is good if you have real-time processes.
>
> There are also RLIMITs for memory consumption.
>
> Consult:
> http://kernel.org/doc/man-pages/online/pages/man2/getrlimit.2.html
>

thank you for the link, I will look into it.

Vincent
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