Date: Fri, 28 Aug 2009 10:23:57 -0400 From: John Baldwin <jhb@freebsd.org> To: src-committers@freebsd.org Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org Subject: Re: svn commit: r196615 - in head/sys: kern sys vm Message-ID: <200908281023.57489.jhb@freebsd.org> In-Reply-To: <200908281406.n7SE6uK6026804@svn.freebsd.org> References: <200908281406.n7SE6uK6026804@svn.freebsd.org>
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On Friday 28 August 2009 10:06:56 am John Baldwin wrote: > Author: jhb > Date: Fri Aug 28 14:06:55 2009 > New Revision: 196615 > URL: http://svn.freebsd.org/changeset/base/196615 > > Log: > Extend the device pager to support different memory attributes on different > pages in an object. > - Add a new variant of d_mmap() currently called d_mmap2() which accepts > an additional in/out parameter that is the memory attribute to use for > the requested page. > - A driver either uses d_mmap() or d_mmap2() for all requests but not both. > The current implementation uses a flag in the cdevsw (D_MMAP2) to indicate > that the driver provides a d_mmap2() handler instead of d_mmap(). This > is done to make the change ABI compatible with existing drivers and > MFC'able to 7 and 8. The future plan for 9.0 is to just convert d_mmap() to the newer API/ABI and remove d_mmap2(). However, the current version of this patch is MFC'able without need changes to drivers that do not use the new parameter. -- John Baldwin
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