Date: Mon, 20 Aug 2007 06:36:12 +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 kern_switch.c Message-ID: <200708200636.l7K6aCCE065820@repoman.freebsd.org>
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jeff 2007-08-20 06:36:12 UTC
FreeBSD src repository
Modified files:
sys/kern kern_switch.c
Log:
- Improve runq_findbit_from() which is used by ULE's circular queue. Mask
of the bits we want to ignore on the first pass rather than doing a
linear scan. This puts us within a few instructions of the cost of
runq_findbit() and removes this function from the top of profiling output
for context switch heavy workloads.
Approved by: re
Revision Changes Path
1.134 +22 -32 src/sys/kern/kern_switch.c
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