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Re: Review of Thomas's >2GB ext2fs proposal

From: Thomas Bushnell BSG
Subject: Re: Review of Thomas's >2GB ext2fs proposal
Date: 17 Aug 2004 02:30:43 -0700
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3

Ognyan Kulev <ogi@fmi.uni-sofia.bg> writes:

> This is new to me.  I always thought that vm_map/vm_unmap is expensive.

It is a system call.  But it is nothing as expensive as a disk read.
It is worth avoiding unnecessary calls to vm_map; it is the same as
vm_allocate.  It is entirely harmless to augment a disk access with a
vm_map call.

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