Re: [PATCH 2/2] pid: Optional first-fit pid allocation
From: Andrew Morton <akpm@linux-foundation.org>
Date: 2025-02-22 00:18:55
Also in:
linux-fsdevel, linux-trace-kernel, lkml
On Fri, 21 Feb 2025 18:02:49 +0100 Michal Koutný [off-list ref] wrote:
quoted hunk ↗ jump to hunk
--- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst@@ -1043,6 +1043,8 @@ The last pid allocated in the current (the one task using this sysctl lives in) pid namespace. When selecting a pid for a next task on fork kernel tries to allocate a number starting from this one. +When set to -1, first-fit pid numbering is used instead of the next-fit. +
This seems thin. Is there more we can tell our users? What are the visible effects of this? What are the benefits? Why would they want to turn it on? I mean, there are veritable paragraphs in the changelogs, but just a single line in the user-facing docs. Seems there could be more...