Jonathan Morton wrote:
>
> >Out of Memory: Killed process 117 (sendmail).
> >
> >What we did to run it out of memory, I don't know. But I do know that
> >it shouldn't be killing one process more than once... (the process
> >should not exist after one try...)
>
> This is a known bug in the Out-of-Memory handler, where it does not count the buffer
>and cache memory as "free" (it should), causing premature OOM killing. It is,
>however, normal for the OOM killer to attempt to kill a process more than once - it
>takes a few scheduler cycles for the SIGKILL to actually reach the process and take
>effect.
>
> Also, it probably shouldn't have killed Sendmail, since that is usually a
>long-running, low-UID (and important) process. The OOM-kill selector is another
>thing that wants fixing, and my patch contains a *very rough* beginning to this.
>
> The following patch should solve your problem for now, until a more detailed fix
>(which also clears up many other problems) is available in the stable kernel.
>
> Alan and/or Linus may wish to apply this patch too...
>
> (excerpt from my original patch from Saturday follows)
>
> --- start ---
> diff -u linux-2.4.1.orig/mm/oom_kill.c linux/mm/oom_kill.c
> --- linux-2.4.1.orig/mm/oom_kill.c Tue Nov 14 18:56:46 2000
> +++ linux/mm/oom_kill.c Sat Mar 24 20:35:20 2001
> @@ -76,7 +76,9 @@
> run_time = (jiffies - p->start_time) >> (SHIFT_HZ + 10);
>
> points /= int_sqrt(cpu_time);
> - points /= int_sqrt(int_sqrt(run_time));
> +
> + /* Long-running processes are *very* important, so don't take the 4th root */
> + points /= run_time;
>
> /*
> * Niced processes are most likely less important, so double
> @@ -93,6 +95,10 @@
> p->uid == 0 || p->euid == 0)
> points /= 4;
>
> + /* Much the same goes for processes with low UIDs */
> + if(p->uid < 100 || p->euid < 100)
> + points /= 2;
> +
Plase change to 100 to 500 - this would make it consistant with
the useradd command, which starts adding new users at the UID 500
-
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