lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 12 Mar 2020 11:44:27 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Alexey Dobriyan <adobriyan@...il.com> Cc: mingo@...hat.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/2] sched: make nr_running() return "unsigned int" On Thu, Mar 12, 2020 at 12:06:08AM +0300, Alexey Dobriyan wrote: > I don't anyone have been crazy enough to spawn 2^32 threads. > It'd require absurd amounts of physical memory. And we're going to 5 level page-tables because 48 bits physical isn't enough. 57 bits of physical is plenty space to spawn that many tasks and still have some left over. Now 32 bit tasks is indeed insane, but memory isn't the problem. The actual limit is the pid-space, which is 30 bits.
Powered by blists - more mailing lists