Date: Thu, 7 Jun 2007 16:04:23 +0000 (UTC) From: Marcel Moolenaar <marcel@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/ia64/ia64 pmap.c Message-ID: <200706071604.l57G4Oa6009262@repoman.freebsd.org>
next in thread | raw e-mail | index | archive | help
marcel 2007-06-07 16:04:23 UTC
FreeBSD src repository
Modified files:
sys/ia64/ia64 pmap.c
Log:
Eliminate pmap_install(), which was used to wrap pmap_switch() and
grab sched_lock. This would serialize calls to pmap_switch from
cpu_switch(). With the introduction of thread_lock, this is not
possible anymore, because thread_lock is not a single lock. It
varies. Secondly and most importantly, it's not needed at all. The
only requirement for pmap_switch() is that it's not preempted
while in the middle of updating the CPU and PCPU. In other words,
it's a critical region. No locking required.
Revision Changes Path
1.189 +43 -55 src/sys/ia64/ia64/pmap.c
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200706071604.l57G4Oa6009262>