Date: Wed, 5 Jan 2005 21:13:27 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern kern_mutex.c src/sys/sys mutex.h Message-ID: <200501052113.j05LDRhG040492@repoman.freebsd.org>
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jhb 2005-01-05 21:13:27 UTC
FreeBSD src repository
Modified files:
sys/kern kern_mutex.c
sys/sys mutex.h
Log:
Rework the optimization for spinlocks on UP to be slightly less drastic and
turn it back on. Specifically, the actual changes are now less intrusive
in that the _get_spin_lock() and _rel_spin_lock() macros now have their
contents changed for UP vs SMP kernels which centralizes the changes.
Also, UP kernels do not use _mtx_lock_spin() and no longer include it. The
UP versions of the spin lock functions do not use any atomic operations,
but simple compares and stores which allow mtx_owned() to still work for
spin locks while removing the overhead of atomic operations.
Tested on: i386, alpha
Revision Changes Path
1.152 +2 -8 src/sys/kern/kern_mutex.c
1.74 +26 -5 src/sys/sys/mutex.h
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