Re: [PATCH 00/14] Present useful limits to user (v2)

Peter Zijlstra
2016-07-15T13:59:56Z

On Fri, Jul 15, 2016 at 01:52:48PM +0000, Topi Miettinen wrote:
> On 07/15/16 12:43, Peter Zijlstra wrote:
> > On Fri, Jul 15, 2016 at 01:35:47PM +0300, Topi Miettinen wrote:
> >> Hello,
> >>
> >> There are many basic ways to control processes, including capabilities,
> >> cgroups and resource limits. However, there are far fewer ways to find out
> >> useful values for the limits, except blind trial and error.
> >>
> >> This patch series attempts to fix that by giving at least a nice starting
> >> point from the highwater mark values of the resources in question.
> >> I looked where each limit is checked and added a call to update the mark
> >> nearby.
> >
> > And how is that useful? Setting things to the high watermark is
> > basically the same as not setting the limit at all.
>
> What else would you use, too small limits?

That question doesn't make sense.

What's the point of setting a limit if it ends up being the same as
no-limit (aka unlimited).

If you cannot explain; and you have not so far; what use these values
are, why would we look at the patches.