From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3AB77443.55B42469@mandrakesoft.com> Date: Tue, 20 Mar 2001 10:16:19 -0500 From: Jeff Garzik MIME-Version: 1.0 Subject: Re: 3rd version of R/W mmap_sem patch available References: <3AB77311.77EB7D60@uow.edu.au> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Linus Torvalds , linux-mm@kvack.org List-ID: Andrew Morton wrote: > General comment: an expensive part of a pagefault > is zeroing the new page. It'd be nice if we could > drop the page_table_lock while doing the clear_user_page() > and, if possible, copy_user_page() functions. Very nice. People have talked before about creating zero pages in the background, or creating them as a side effect of another operation (don't recall details), so yeah this is definitely an area where some optimizations could be done. I wouldn't want to do it until 2.5 though... -- Jeff Garzik | May you have warm words on a cold evening, Building 1024 | a full mooon on a dark night, MandrakeSoft | and a smooth road all the way to your door. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux.eu.org/Linux-MM/