Date: Wed, 11 Aug 2004 03:33:32 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/dev/random randomdev_soft.c Message-ID: <200408110333.i7B3XWaO049406@repoman.freebsd.org>
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rwatson 2004-08-11 03:33:32 UTC
FreeBSD src repository
Modified files:
sys/dev/random randomdev_soft.c
Log:
Perform a lockless read to test whether an entropy havesting fifo is
full, avoiding the cost of mutex operations if it is. We re-test
once the mutex is acquired to make sure it's still true before doing
the -modify-write part of the read-modify-write. Note that due to
the maximum fifo depth being pretty deep, this is unlikely to improve
harvesting performance yet.
Approved by: markm
Revision Changes Path
1.4 +4 -0 src/sys/dev/random/randomdev_soft.c
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