Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932255AbWJEVnW (ORCPT ); Thu, 5 Oct 2006 17:43:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932283AbWJEVmv (ORCPT ); Thu, 5 Oct 2006 17:42:51 -0400 Received: from smtp007.mail.ukl.yahoo.com ([217.12.11.96]:60594 "HELO smtp007.mail.ukl.yahoo.com") by vger.kernel.org with SMTP id S932255AbWJEVmT (ORCPT ); Thu, 5 Oct 2006 17:42:19 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.it; h=Received:From:Subject:Date:To:Cc:Bcc:Message-Id:In-Reply-To:References:Content-Type:Content-Transfer-Encoding:User-Agent; b=PQe2Au2zFucVfrarCHmbssToGj8KYFqzMM7L45mDSeZWzrsvVUXua2hLOGFmq8VATK+rEYePjh0pG+YxogtarHH7stdEjvCIGnRRtF6xiP/crTDQ7mx0IWfDkJdqwTnysJzk3eSeIEsuVu+BU0JcqG5W0zX3fJy0qLQyo4wXVd4= ; From: "Paolo 'Blaisorblade' Giarrusso" Subject: [PATCH 14/14] uml: allow finer tuning for host VMSPLIT setting Date: Thu, 05 Oct 2006 23:39:20 +0200 To: Andrew Morton Cc: Jeff Dike , linux-kernel@vger.kernel.org, user-mode-linux-devel@lists.sourceforge.net Message-Id: <20061005213920.17268.4856.stgit@memento.home.lan> In-Reply-To: <20061005213212.17268.7409.stgit@memento.home.lan> References: <20061005213212.17268.7409.stgit@memento.home.lan> Content-Type: text/plain; charset=utf-8; format=fixed Content-Transfer-Encoding: 8bit User-Agent: StGIT/0.9 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3041 Lines: 84 From: Paolo 'Blaisorblade' Giarrusso Now that various memory splits are enabled, add a config option allowing the user to compile UML for its need - HOST_2G_2G allowed to choose either 3G/1G or 2G/2G, and enabling it reduced the usable virtual memory. Detecting this at run time should be implemented in the future, but we must make the stop-gap measure work well enough (this is valid in _many_ cases). Signed-off-by: Paolo 'Blaisorblade' Giarrusso --- arch/um/Kconfig.i386 | 49 ++++++++++++++++++++++++++++++++++--------------- 1 files changed, 34 insertions(+), 15 deletions(-) diff --git a/arch/um/Kconfig.i386 b/arch/um/Kconfig.i386 index f6eb72d..f191a55 100644 --- a/arch/um/Kconfig.i386 +++ b/arch/um/Kconfig.i386 @@ -16,23 +16,42 @@ config SEMAPHORE_SLEEPERS bool default y -config HOST_2G_2G - bool "2G/2G host address space split" - default n - help - This is needed when the host on which you run has a 2G/2G memory - split, instead of the customary 3G/1G. - - Note that to enable such a host - configuration, which makes sense only in some cases, you need special - host patches. - - So, if you do not know what to do here, say 'N'. +choice + prompt "Host memory split" + default HOST_VMSPLIT_3G + ---help--- + This is needed when the host kernel on which you run has a non-default + (like 2G/2G) memory split, instead of the customary 3G/1G. If you did + not recompile your own kernel but use the default distro's one, you can + safely accept the "Default split" option. + + It can be enabled on recent (>=2.6.16-rc2) vanilla kernels via + CONFIG_VM_SPLIT_*, or on previous kernels with special patches (-ck + patchset by Con Kolivas, or other ones) - option names match closely the + host CONFIG_VM_SPLIT_* ones. + + A lower setting (where 1G/3G is lowest and 3G/1G is higher) will + tolerate even more "normal" host kernels, but an higher setting will be + stricter. + + So, if you do not know what to do here, say 'Default split'. + + config HOST_VMSPLIT_3G + bool "Default split (3G/1G user/kernel host split)" + config HOST_VMSPLIT_3G_OPT + bool "3G/1G user/kernel host split (for full 1G low memory)" + config HOST_VMSPLIT_2G + bool "2G/2G user/kernel host split" + config HOST_VMSPLIT_1G + bool "1G/3G user/kernel host split" +endchoice config TOP_ADDR - hex - default 0xc0000000 if !HOST_2G_2G - default 0x80000000 if HOST_2G_2G + hex + default 0xB0000000 if HOST_VMSPLIT_3G_OPT + default 0x78000000 if HOST_VMSPLIT_2G + default 0x40000000 if HOST_VMSPLIT_1G + default 0xC0000000 config 3_LEVEL_PGTABLES bool "Three-level pagetables (EXPERIMENTAL)" Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/