Date: Tue, 12 Oct 2010 17:40:45 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/kern subr_smp.c Message-ID: <201010121741.o9CHf2vf002770@repoman.freebsd.org>
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avg 2010-10-12 17:40:45 UTC
FreeBSD src repository
Modified files:
sys/kern subr_smp.c
Log:
SVN rev 213736 on 2010-10-12 17:40:45Z by avg
generic_stop_cpus: prevent parallel execution
This is based on the same approach as used in panic().
In theory parallel execution of generic_stop_cpus() could lead to two CPUs
stopping each other and everyone else, and thus a total system halt.
Also, in theory, we should have some smarter locking here, because two
(or more CPUs) could be stopping unrelated sets of CPUs.
But in practice, it seems, this function is only used to stop
"all other" CPUs.
Additionally, I took this opportunity to make amd64-specific suspend_cpus()
function use generic_stop_cpus() instead of rolling out essentially
duplicate code.
This code is based on code by Sandvine Incorporated.
Suggested by: mdf
Reviewed by: jhb, jkim (earlier version)
MFC after: 2 weeks
Revision Changes Path
1.222 +17 -45 src/sys/kern/subr_smp.c
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