OOM problem?

[Johannes Lundberg]

On Fri, Dec 8, 2017 at 6:27 PM, Warner Losh <imp at bsdimp.com> wrote:
>
>
> AIX had SIGDANGER that would be sent when pages were getting scarce. There
> were still pages to be had in the system, just not many, and the idea was
> when you got tight on, but not out of, memory, you'd signal all the programs
> in the system to give them a chance to return pages to the OS they were done
> with. I don't recall all the details, but AIX's syslog-ish thing would
> create an error log when that happened. Some programs would flush all or
> part of their cache, etc. It worked fairly well (in that the signal was
> delivered), but did depend on the cooperation of the running processes not
> to do something stupid.
> https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/com.ibm.aix.osdevice/page_space_trouble.htm
> has a minimalistic description.
>
> Not that I'm advocating it, per se, but there is historical precedent for
> this feature.
>
> Warner
>

Thanks for the info. I had no idea :)