Date: Sat, 18 Jan 2003 09:02:33 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: freebsd-current@freebsd.org Subject: which is preferred: vm_page_hold() or vm_map_wire()? Message-ID: <15913.24185.962327.437269@grasshopper.cs.duke.edu>
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I'm re-examining some of our driver code where we need to wire down a portion of a user's address space for DMA for os-bypass networking. We currently do vm_map_wire(). This is nice, as it presents a simple interface, but I think its pretty high overhead the way our driver calls it (a page at a time). Since this should be a short-lived mapping, I assume we could also get away with using vm_page_hold() like vmapbuf() does? Note that I don't want all of vmapbuf, as I don't want to waste kva space by mapping the page into the kernel... I just need to dma it, not read or write it. Which is the preferred api for somebody like me? Thanks, Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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