[RFC] nptl: change default stack guard size of threads

[Wilco Dijkstra]

Florian Weimer wrote:
> On 11/29/2017 11:38 PM, Carlos O'Donell wrote:
>> On 11/29/2017 02:28 PM, Wilco Dijkstra wrote:
>>> Why should it be any different from LP64? Typical page size will still be
>>> 64KB, so a 4KB guard would be rounded up to 64KB. An ILP32 system
>>> with 64KB pages could create  ~30000 threads per process. Does that
>>> make it unusable?
>> 
>> ... and this is already configurable via pthread_attr_setguardsize(), so
>> you *could* tune a system to have smaller guards against the recommendation
>> of the runtime authors?
>
> Sure, if you recompile your application.  That's not really a solution IMHO.

You've got to do that already in order to run it on ILP32 - there isn't exactly
a large amount of existing ILP32 binaries around, let alone ones that need more
than 30000 threads per process.

Wilco