Module Name: src Committed By: martin Date: Thu Nov 30 14:31:04 UTC 2017
Modified Files: src/sys/kern [netbsd-8]: subr_localcount.c src/sys/sys [netbsd-8]: localcount.h Log Message: Pull up following revision(s) (requested by ozaki-r in ticket #404): sys/sys/localcount.h: revision 1.5 sys/kern/subr_localcount.c: revision 1.7 Implement a debugging facility (overflow/underflow detection) for localcount We cannot get an accurate count from a localcount instance because it consists of per-cpu counters and we have no way to sum them up atomically. So we cannot detect counter overflow/underflow as we can do on a normal refcount. The facility adds an atomic counter to each localcount instance to enable the validations. The counter ups and downs in synchronization with the per-CPU counters. The counter is used iff both DEBUG and LOCKDEBUG are enabled in the kernel. Discussed on tech-kern@ To generate a diff of this commit: cvs rdiff -u -r1.4 -r1.4.2.1 src/sys/kern/subr_localcount.c cvs rdiff -u -r1.4 -r1.4.2.1 src/sys/sys/localcount.h Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.