From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: The 4GB memory thing References: <199911041848.KAA55976@google.engr.sgi.com> From: Andrea Arcangeli Date: 05 Nov 1999 00:41:39 +0100 In-Reply-To: kanoj@google.engr.sgi.com's message of "Thu, 4 Nov 1999 10:48:20 -0800 (PST)" Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org Return-Path: To: Kanoj Sarcar Cc: nconway.list@ukaea.org.uk, linux-mm@kvack.org List-ID: kanoj@google.engr.sgi.com (Kanoj Sarcar) writes: > I don't see a README.gz under > http://www.kernel.org/pub/linux/kernel/people/andrea/tools/apply-patches/ lftp> pwd ftp://ftp.it.kernel.org/pub/linux/kernel/people/andrea/tools/apply-patches lftp> ls README.gz -rw-r--r-- 1 ftp daemon 875 Oct 25 00:43 README.gz lftp> > In any case, did you a have a small technical README on how rawio works > on bigmem in 2.2.13aa3? Btw, I haven't seen the rawio 2.2 port, I am As first you can have a look at the rawio patch. ftp://ftp.it.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.2/2.2.13aa3/z-bigmem-rawio-2.2.13aa2-1.gz The above patch includes all the necessary stuff to make rawio working fine on bigmem pages. Basically the code uses regular pages as bounce buffers to do the I/O on bigmem pages. > assuming its very similar to 2.3 ... where brw_kiovec() refuses to > accept PageHighMem pages. I didn't see anything in > z-bigmem-2.2.13aa3-7 No. The z-bigmem-rawio-2.2.13aa2-1.gz in 2.2.13aa3 allows brw_kiovec to do I/O on bigmem pages. > that tinkers either with fs/buffer.c. I take the bigmem stuff separated from rawio. The rawio patch (pointed out above) included in 2.2.13aa3 is an incremental patch that goes on the top of bigmem. I take all the patches separated to allow everybody out there to merge easily my stuff and to see the only related necessary changes on topic. -- Andrea -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://humbolt.geo.uu.nl/Linux-MM/