From owner-cvs-all@FreeBSD.ORG Wed Sep 3 23:05:52 2003 Return-Path: Delivered-To: cvs-all@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8827616A4C0 for ; Wed, 3 Sep 2003 23:05:52 -0700 (PDT) Received: from relay.pair.com (relay.pair.com [209.68.1.20]) by mx1.FreeBSD.org (Postfix) with SMTP id D6C0743FAF for ; Wed, 3 Sep 2003 23:05:50 -0700 (PDT) (envelope-from silby@silby.com) Received: (qmail 50656 invoked from network); 4 Sep 2003 06:05:49 -0000 Received: from niwun.pair.com (HELO localhost) (209.68.2.70) by relay.pair.com with SMTP; 4 Sep 2003 06:05:49 -0000 X-pair-Authenticated: 209.68.2.70 Date: Thu, 4 Sep 2003 01:04:31 -0500 (CDT) From: Mike Silbersack To: Jeff Roberson In-Reply-To: <20030827231807.I12093-100000@mail.chesapeake.net> Message-ID: <20030904010250.L15754@odysseus.silby.com> References: <20030827231807.I12093-100000@mail.chesapeake.net> MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="0-2111628021-1062655471=:16553" cc: cvs-src@FreeBSD.org cc: src-committers@FreeBSD.org cc: cvs-all@FreeBSD.org cc: Marcel Moolenaar Subject: Re: cvs commit: src/sys/fs/specfs spec_vnops.c X-BeenThere: cvs-all@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the entire tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Sep 2003 06:05:52 -0000 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. --0-2111628021-1062655471=:16553 Content-Type: TEXT/PLAIN; charset=US-ASCII On Wed, 27 Aug 2003, Jeff Roberson wrote: > It uses an 8 bit index to identify individual items in a slab. This is to > save space in place of the full pointer that is used in traditional slab > allocators. With an 8 bit index your smallest allocation on 4k pages is > 16 bytes and 32 bytes on 8k. It'd be 128 bytes on 32k. You're going to > have to conditionally compile UMA with 16bit indexes. > > Cheers, > Jeff You can't just change the index to 16 bits, it'll break. I've attached a patch which allows you to play with the freelist type freely... I don't have any immediate plans to commit it (now that I'm sidetracked onto other things), but I think it's solid. 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