Date: Tue, 23 Nov 1999 10:46:10 -0800 (PST) From: Matt Dillon <dillon@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/i386 mplock.s Message-ID: <199911231846.KAA14093@freefall.freebsd.org>
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dillon 1999/11/23 10:46:10 PST
Modified files:
sys/i386/i386 mplock.s
Log:
Add in required instruction serialization prior to releasing the
MP lock for the last time. The use of a locked instruction to
cpu-private memory is 3x faster then CPUID and 3x faster then the
use of a locked instruction to shared memory (the lock itself).
Instruction serialization is required to ensure that any pending
memory ops are properly flushed prior to the release of the lock,
due to out-of-order instruction execution by the cpu.
Revision Changes Path
1.28 +21 -2 src/sys/i386/i386/mplock.s
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