Date: Sat, 27 Mar 2004 14:05:56 -0600 (CST) From: Mike Silbersack <silby@silby.com> To: Alan Cox <alc@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern subr_param.c sys_pipe.c src/sys/sys pipe.h Message-ID: <20040327140454.H3199@odysseus.silby.com> In-Reply-To: <200403271950.i2RJoN9P033780@repoman.freebsd.org> References: <200403271950.i2RJoN9P033780@repoman.freebsd.org>
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On Sat, 27 Mar 2004, Alan Cox wrote: > Log: > Revise the direct or optimized case to use uiomove_fromphys() by the reader > instead of ephemeral mappings using pmap_qenter() by the writer. The > writer is still, however, responsible for wiring the pages, just not > mapping them. Consequently, the allocation of KVA for the direct case is > unnecessary. Remove it and the sysctls limiting it, i.e., > kern.ipc.maxpipekvawired and kern.ipc.amountpipekvawired. The number > of temporarily wired pages is still, however, limited by > kern.ipc.maxpipekva. The best advantage of this change is that the workings of direct mapped pipes make much more sense to those of us who are not VM experts. :) Mike "Silby" Silbersack
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