Date: Thu, 17 Apr 2008 09:56:01 +0000 (UTC) From: Jeff Roberson <jeff@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern sched_ule.c Message-ID: <200804170956.m3H9u1nm075979@repoman.freebsd.org>
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jeff 2008-04-17 09:56:01 UTC
FreeBSD src repository
Modified files:
sys/kern sched_ule.c
Log:
- Add a metric to describe how busy a processor has been over the last
two ticks by counting the number of switches and the load when
sched_clock() is called.
- If the busy metric exceeds a threshold allow the idle thread to spin
waiting for new work for a brief period to avoid using IPIs. This
reduces the cost on the sender and receiver as well as reducing wakeup
latency considerably when it works.
Sponsored by: Nokia
Revision Changes Path
1.243 +71 -7 src/sys/kern/sched_ule.c
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