Date: Sat, 1 Dec 2007 11:28:38 +0000 (UTC) From: Attilio Rao <attilio@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern kern_mutex.c kern_rwlock.c Message-ID: <200712011128.lB1BScWA098049@repoman.freebsd.org>
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attilio 2007-12-01 11:28:38 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_7)
sys/kern kern_mutex.c kern_rwlock.c
Log:
MFC kern_mutex.c rev. 1.201 and kern_rwlock.c rev. 1.32:
Simplify adaptive spinning algorithm which should make things faster
when sleeping / waking up waiters.
Also fix a bug with rw_try_upgrade() when adaptive spinning is enabled
as turnstile_lookup() will recurse on ts_lock that will never be
released [1].
[1] Reported by: jeff with Nokia help
Tested by: pho, kris (earlier, bugged version of rwlock part)
Discussed with: jhb, jeff
Approved by: re
Revision Changes Path
1.198.2.1 +41 -29 src/sys/kern/kern_mutex.c
1.28.4.2 +72 -112 src/sys/kern/kern_rwlock.c
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