Re: Improving OOM killer

[Balbir Singh]

* Rik van Riel <riel@xxxxxxxxxx> [2010-02-03 09:49:18]:

> On 02/01/2010 05:02 PM, Lubos Lunak wrote:
> 
> >  In other words, use VmRSS for measuring memory usage instead of VmSize, and
> >remove child accumulating.
> 
> I agree with removing the child accumulating code.  That code can
> do a lot of harm with databases like postgresql, or cause the
> system's main service (eg. httpd) to be killed when a broken cgi
> script used up too much memory.
>
> IIRC the child accumulating code was introduced to deal with
> malicious code (fork bombs), but it makes things worse for the
> (much more common) situation of a system without malicious
> code simply running out of memory due to being very busy.
>

For fork bombs, we could do a number of children number test and have
a threshold before we consider a process and its children for
badness().

> I have no strong opinion on using RSS vs VmSize.
> 

David commented and feels strongly about RSS and prefers VmSize.

-- 
	Balbir
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/