[DragonFlyBSD - Bug #2502] tmpfs(5) not fully MPSAFE

[Francois Tigeot via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>]

Issue #2502 has been reported by ftigeot.

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Bug #2502: tmpfs(5) not fully MPSAFE
http://bugs.dragonflybsd.org/issues/2502

Author: ftigeot
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


Bulk building packages with ports-mgmt/poudriere on a 16 cores/32 threads machine is very slow.

The system exhibits high level of mp_token contention.
The functions grabbing it the most are:

vop_inactive vop_readdir vop_setattr vop_ncreate
vop_close vop_nresolv vop_nlink vop_putpage

with vop_inactive() by far the worst offender.

As the only non fully-MPSAFE used filesystem, tmpfs(5) is an obvious culprit.


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