[DragonFlyBSD - Bug #2868] tmpfs problems: incorrect size, no auto-size

bugtracker-admin at leaf.dragonflybsd.org bugtracker-admin at leaf.dragonflybsd.org
Sun Dec 20 00:47:14 PST 2015

Issue #2868 has been updated by marino.

208 should have been 232 but then it would be 108 + 108 + 108 > 232.

The point being dragonfly doesn't try to resize X tmpfs mounts based on available memory.  If you have 3 mounts, do you shrink them proportionally?  by the same amount?  only 1 and leave the X-1 others alone?  

Again, just defining the max size would solve all the uncertainty.

Bug #2868: tmpfs problems: incorrect size, no auto-size

* Author: arcade at b1t.name
* Status: New
* Priority: Low
* Assignee: 
* Category: VFS subsystem
* Target version: 
tmpfs version in DragonFly is limited  when comparing to FreeBSD:

1. When tmpfs is mounted automatically it's size by default (per man page) should be equal to all free mem + all free swap. Instead tmpfs filesystems are created with a fairly small size - like 200k on host with 1G mem.
2. tmpfs size should be auto adjusted when other processes are eating mem or when swap is added. Instead as swap is initialized after mounting /tmp swap addition doesn't make tmpfs grow. On the other hand I never saw tmpfs shrinking when all available memory is used.

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