From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nick Piggin Date: Tue, 18 Apr 2006 06:42:40 +0000 Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules Message-Id: <44448A60.4040903@yahoo.com.au> List-Id: References: <1145049535.1336.128.camel@localhost.localdomain> <4440855A.7040203@yahoo.com.au> <20060417220238.GD3945@localhost.localdomain> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Steven Rostedt Cc: Ravikiran G Thirumalai , Christoph Lameter , LKML , Andrew Morton , Linus Torvalds , Ingo Molnar , Thomas Gleixner , Andi Kleen , Martin Mares , bjornw@axis.com, schwidefsky@de.ibm.com, benedict.gaster@superh.com, lethal@linux-sh.org, Chris Zankel , Marc Gauthier , Joe Taylor , David Mosberger-Tang , rth@twiddle.net, spyro@f2s.com, starvik@axis.com, tony.luck@intel.com, linux-ia64@vger.kernel.org, ralf@linux-mips.org, linux-mips@linux-mips.org, grundler@parisc-linux.org, parisc-linux@parisc-linux.org, linuxppc-dev@ozlabs.org, paulus@samba.org, linux390@de.ibm.com, davem@davemloft.net Steven Rostedt wrote: > Understood, but I'm going to start looking in the way Rusty and Arnd > suggested with the vmalloc approach. This would allow for saving of > memory and dynamic allocation of module memory making it more robust. And > all this without that evil extra indirection! Remember that this approach could effectively just move the indirection to the TLB / page tables (well, I say "moves" because large kernel mappings are effectively free compared with 4K mappings). So be careful about coding up a large amount of work before unleashing it: I doubt you'll be able to find a solution that doesn't involve tradeoffs somewhere (but wohoo if you can). -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Tue, 18 Apr 2006 07:46:15 +0100 (BST) Received: from smtp104.mail.mud.yahoo.com ([209.191.85.214]:62051 "HELO smtp104.mail.mud.yahoo.com") by ftp.linux-mips.org with SMTP id S8133366AbWDRGqG (ORCPT ); Tue, 18 Apr 2006 07:46:06 +0100 Received: (qmail 62129 invoked from network); 18 Apr 2006 06:42:58 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=dJPbW3t6xPNCfvF6yqd1GCrNucJLx6TBPHnc78OkIR11SlIiNv7iThiodhX8cMBfax80X22ISPEab+ZhthQXDGunPGx4j3/dPw2Q0Bg7P2PcBjUKyqe7jco/laGmdrwvONv2v4kEGGN69+11G4tEh6VtqzxKyq9vXw2TSlK9UBU= ; Received: from unknown (HELO ?192.168.0.1?) (nickpiggin@203.173.7.230 with plain) by smtp104.mail.mud.yahoo.com with SMTP; 18 Apr 2006 06:42:57 -0000 Message-ID: <44448A60.4040903@yahoo.com.au> Date: Tue, 18 Apr 2006 16:42:40 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 X-Accept-Language: en MIME-Version: 1.0 To: Steven Rostedt CC: Ravikiran G Thirumalai , Christoph Lameter , LKML , Andrew Morton , Linus Torvalds , Ingo Molnar , Thomas Gleixner , Andi Kleen , Martin Mares , bjornw@axis.com, schwidefsky@de.ibm.com, benedict.gaster@superh.com, lethal@linux-sh.org, Chris Zankel , Marc Gauthier , Joe Taylor , David Mosberger-Tang , rth@twiddle.net, spyro@f2s.com, starvik@axis.com, tony.luck@intel.com, linux-ia64@vger.kernel.org, ralf@linux-mips.org, linux-mips@linux-mips.org, grundler@parisc-linux.org, parisc-linux@parisc-linux.org, linuxppc-dev@ozlabs.org, paulus@samba.org, linux390@de.ibm.com, davem@davemloft.net Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules References: <1145049535.1336.128.camel@localhost.localdomain> <4440855A.7040203@yahoo.com.au> <20060417220238.GD3945@localhost.localdomain> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 11151 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: nickpiggin@yahoo.com.au Precedence: bulk X-list: linux-mips Steven Rostedt wrote: > Understood, but I'm going to start looking in the way Rusty and Arnd > suggested with the vmalloc approach. This would allow for saving of > memory and dynamic allocation of module memory making it more robust. And > all this without that evil extra indirection! Remember that this approach could effectively just move the indirection to the TLB / page tables (well, I say "moves" because large kernel mappings are effectively free compared with 4K mappings). So be careful about coding up a large amount of work before unleashing it: I doubt you'll be able to find a solution that doesn't involve tradeoffs somewhere (but wohoo if you can). -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp104.mail.mud.yahoo.com (smtp104.mail.mud.yahoo.com [209.191.85.214]) by ozlabs.org (Postfix) with SMTP id 20089679F0 for ; Tue, 18 Apr 2006 16:58:24 +1000 (EST) Message-ID: <44448A60.4040903@yahoo.com.au> Date: Tue, 18 Apr 2006 16:42:40 +1000 From: Nick Piggin MIME-Version: 1.0 To: Steven Rostedt Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules References: <1145049535.1336.128.camel@localhost.localdomain> <4440855A.7040203@yahoo.com.au> <20060417220238.GD3945@localhost.localdomain> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Cc: Andrew Morton , linux-mips@linux-mips.org, David Mosberger-Tang , linux-ia64@vger.kernel.org, Martin Mares , spyro@f2s.com, Joe Taylor , Andi Kleen , linuxppc-dev@ozlabs.org, paulus@samba.org, benedict.gaster@superh.com, bjornw@axis.com, Ingo Molnar , Ravikiran G Thirumalai , Christoph Lameter , grundler@parisc-linux.org, starvik@axis.com, Linus Torvalds , Thomas Gleixner , rth@twiddle.net, Chris Zankel , tony.luck@intel.com, LKML , ralf@linux-mips.org, Marc Gauthier , lethal@linux-sh.org, schwidefsky@de.ibm.com, linux390@de.ibm.com, davem@davemloft.net, parisc-linux@parisc-linux.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Steven Rostedt wrote: > Understood, but I'm going to start looking in the way Rusty and Arnd > suggested with the vmalloc approach. This would allow for saving of > memory and dynamic allocation of module memory making it more robust. And > all this without that evil extra indirection! Remember that this approach could effectively just move the indirection to the TLB / page tables (well, I say "moves" because large kernel mappings are effectively free compared with 4K mappings). So be careful about coding up a large amount of work before unleashing it: I doubt you'll be able to find a solution that doesn't involve tradeoffs somewhere (but wohoo if you can). -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com