Jeff Roberson wrote:
jeff 2008-03-19 07:35:14 UTC
FreeBSD src repository
Modified files:
sys/kern subr_sleepqueue.c
Log:
- At the top of sleepq_catch_signals() lock the thread and check
TDF_NEEDSIGCHK
before doing the very expensive cursig() and related locking. NEEDSIGCHK
is updated whenever our signal mask change or when a signal is delivered
and
should be sufficient to avoid the more expensive tests. This eliminates
another source of PROC_LOCK contention in multithreaded programs.
Revision Changes Path
1.50 +12 -4 src/sys/kern/subr_sleepqueue.c
This may break process suspension, a more completed patch is here:
(though it is outdated):
http://people.freebsd.org/~davidxu/patch/PCATCH_optimize.patch
In one word, process suspending may be in progress, and the thread
should check it.
Regards,
David Xu
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