---
- branch: netbsd-8
  date: Thu Nov 30 14:31:04 UTC 2017
  files:
  - new: 1.4.2.1
    old: '1.4'
    path: src/sys/kern/subr_localcount.c
    pathrev: src/sys/kern/subr_localcount.c@1.4.2.1
    type: modified
  - new: 1.4.2.1
    old: '1.4'
    path: src/sys/sys/localcount.h
    pathrev: src/sys/sys/localcount.h@1.4.2.1
    type: modified
  id: 20171130T143104Z.11024f1b4e2a6d5a5939849c3757406ea9e55f5b
  log: "Pull up following revision(s) (requested by ozaki-r in ticket #404):\n\tsys/sys/localcount.h:
    revision 1.5\n\tsys/kern/subr_localcount.c: revision 1.7\nImplement a debugging
    facility (overflow/underflow detection) for localcount\nWe cannot get an accurate
    count from a localcount instance because it consists\nof per-cpu counters and
    we have no way to sum them up atomically. So we cannot\ndetect counter overflow/underflow
    as we can do on a normal refcount.\nThe facility adds an atomic counter to each
    localcount instance to enable the\nvalidations. The counter ups and downs in synchronization
    with the per-CPU\ncounters. The counter is used iff both DEBUG and LOCKDEBUG are
    enabled in the\nkernel.\nDiscussed on tech-kern@\n"
  module: src
  subject: 'CVS commit: [netbsd-8] src/sys'
  unixtime: '1512052264'
  user: martin