Date: Thu, 30 Sep 2004 07:04:03 +0000 (UTC) From: Poul-Henning Kamp <phk@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/sys systm.h src/sys/conf files src/sys/kern subr_unit.c Message-ID: <200409300704.i8U744rg051025@repoman.freebsd.org>
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phk 2004-09-30 07:04:03 UTC FreeBSD src repository Modified files: sys/sys systm.h sys/conf files Added files: sys/kern subr_unit.c Log: Add a new API for allocating unit number (-like) resources. Allocation is always lowest free unit number. A mixed range/bitmap strategy for maximum memory efficiency. In the typical case where no unit numbers are freed total memory usage is 56 bytes on i386. malloc is called M_WAITOK but no locking is provided (yet). A bit of experience will be necessary to determine the best strategy. Hopefully a "caller provides locking" strategy can be maintained, but that may require use of M_NOWAIT allocation and failure handling. A userland test driver is included. Revision Changes Path 1.955 +1 -0 src/sys/conf/files 1.1 +597 -0 src/sys/kern/subr_unit.c (new) 1.215 +8 -0 src/sys/sys/systm.h
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