Date: Mon, 17 Aug 1998 16:42:53 -0700 From: David Greenman <dg@root.com> To: zhihuizhang <bf20761@binghamton.edu> Cc: hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: Virtual Memory for buffer Message-ID: <199808172342.QAA26017@implode.root.com> In-Reply-To: Your message of "Mon, 17 Aug 1998 16:42:37 EDT." <Pine.SOL.L3.93.980817163010.19727B-100000@bingsun2>
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>The virtual memory of buffer is allocated from buffer_map in getnewbuf() >by calling vm_map_findspace() and vm_map_insert(). Its address is saved in >b_kvasize and (sometimes) b_data. These are fine. However, when >allocbuf() extend VMIO buffer size, it *truncates* b_data to a page >boundary before entering buffer pages into KVA. > >I wonder if virtual address space is not always allocated on page >boundary, then it is possible that after the PTE has changed to point to Space is always allocated on a page boundry. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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