Re: [PATCH 3/3] kernel/sysctl.c: threads-max observe limits

[David Rientjes]

On Tue, 24 Feb 2015, Heinrich Schuchardt wrote:

> >> Users can change the maximum number of threads by writing to
> >> /proc/sys/kernel/threads-max.
> >>
> >> With the patch the value entered is checked against the same
> >> limits that apply when fork_init is called.
> >>
> > 
> > Correct me if I'm wrong, but this is a change in functionality (without 
> > update to Documentation/sysctl/kernel.txt which describes threads-max) 
> > since it does not allow the value to be lowered as before from the 
> > calculation involving totalram_pages.  The value passed to 
> > set_max_threads() only caps the value.
> 
> threads_max is set to the value the user inputs if it is inside the
> interval [20, FUTEX_TID_MASK] and it is capped by the value calculated
> from totalram_pages.
> 
> So lowering and raising is still possible (inside the limits).
> 

I believe this information should be added to the documentation cited 
above which mentions threads-max since users will otherwise be unfamiliar 
with the limits imposed.
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