RFR [XS] : 8204598 : add more thread-related system settings info to hs_error file on Linux

[David Holmes]

Hi Matthias,

This seems okay.

Not sure how useful max_map_count may be.

Thanks,
David

On 8/06/2018 6:04 PM, Baesken, Matthias wrote:
> Hi could you please review  this small Linux related change ?
> 
> In linux os::print_os_info ,  I  print additional  info about a number of system parameters influencing thread creation on Linux.
> 
> We noticed the influence of these parameters when looking into an application creating over 10.000 threads on Linux at the same time; there we got an OOM : unable to create new native thread
> which was caused by a failing pthread_create (error EAGAIN) .
> 
> The machine had plenty of memory, so we looked into various kernel params and in the end noticed that /proc/sys/kernel/pid_max was too low.
> The other added parameters "threads-max" and "max_map_count" are also known to be related to problems when running with high thread numbers, so I add them too .
> 
> 
> 
> Webrev :
> 
> http://cr.openjdk.java.net/~mbaesken/webrevs/8204598/
> 
> Bug :
> 
> https://bugs.openjdk.java.net/browse/JDK-8204598
> 
> 
> Thanks, Matthias
>