From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [PATCH] mm: yield during swap prefetching From: Lee Revell In-Reply-To: <200603081322.02306.kernel@kolivas.org> References: <200603081013.44678.kernel@kolivas.org> <200603081312.51058.kernel@kolivas.org> <1141784295.767.126.camel@mindpipe> <200603081322.02306.kernel@kolivas.org> Content-Type: text/plain Date: Tue, 07 Mar 2006 21:27:13 -0500 Message-Id: <1141784834.767.134.camel@mindpipe> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Con Kolivas Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, ck@vds.kolivas.org List-ID: On Wed, 2006-03-08 at 13:22 +1100, Con Kolivas wrote: > > How is the scheduler supposed to know to penalize a kernel compile > > taking 100% CPU but not a game using 100% CPU? > > Because being a serious desktop operating system that we are (bwahahahaha) > means the user should not have special privileges to run something as simple > as a game. Games should not need special scheduling classes. We can always > use 'nice' for a compile though. Real time audio is a completely different > world to this. Actually recent distros like the upcoming Ubuntu Dapper support the new RLIMIT_NICE and RLIMIT_RTPRIO so this would Just Work without any special privileges (well, not root anyway - you'd have to put the user in the right group and add one line to /etc/security/limits.conf). I think OSX also uses special scheduling classes for stuff with RT constraints. The only barrier I see is that games aren't specifically written to take advantage of RT scheduling because historically it's only been available to root. Lee -- 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-mm.org/ . Don't email: email@kvack.org