From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Torvalds Subject: Re: [PATCH 2/11] x86: convert to generic helpers for IPI function calls Date: Tue, 22 Apr 2008 18:22:17 -0700 (PDT) Message-ID: References: <1208890227-24808-1-git-send-email-jens.axboe@oracle.com> <1208890227-24808-3-git-send-email-jens.axboe@oracle.com> <20080422191213.GA6370@elte.hu> <20080422192601.GB12588@elte.hu> <20080423011153.GB17572@wotan.suse.de> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Return-path: In-Reply-To: <20080423011153.GB17572-B4tOwbsTzaBolqkO4TVVkw@public.gmane.org> Sender: linux-arch-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: To: Nick Piggin Cc: Ingo Molnar , Jens Axboe , linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Linux Kernel Mailing List , peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, sam-uyr5N9Q2VtJg9hUCZPvPmw@public.gmane.org On Wed, 23 Apr 2008, Nick Piggin wrote: > > The "too expensive to check the shared queue" is one aspect of it. The > shared queue need not have events *for us* (at least, unless Jens has > changed the implementation a bit) but it can still have events that we > would need to check through. > > I don't think deadlock is a problem (any more than with multiple vectors). I'm happy with it either way, but as pointed out by Ralf, for the MIPS version of the patch there aren't even other vectors available. So sharing the vector is going to be a requirement on other architectures, maybe we should look at whether we can make it generic and peform well regardless? Linus From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:41283 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753421AbYDWBXA (ORCPT ); Tue, 22 Apr 2008 21:23:00 -0400 Date: Tue, 22 Apr 2008 18:22:17 -0700 (PDT) From: Linus Torvalds Subject: Re: [PATCH 2/11] x86: convert to generic helpers for IPI function calls In-Reply-To: <20080423011153.GB17572@wotan.suse.de> Message-ID: References: <1208890227-24808-1-git-send-email-jens.axboe@oracle.com> <1208890227-24808-3-git-send-email-jens.axboe@oracle.com> <20080422191213.GA6370@elte.hu> <20080422192601.GB12588@elte.hu> <20080423011153.GB17572@wotan.suse.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-arch-owner@vger.kernel.org List-ID: To: Nick Piggin Cc: Ingo Molnar , Jens Axboe , linux-arch@vger.kernel.org, Linux Kernel Mailing List , peterz@infradead.org, sam@ravnborg.org Message-ID: <20080423012217.A5pQ557oMUfC8WesgraEC6V9kLibXrx8pJPzW17vHHQ@z> On Wed, 23 Apr 2008, Nick Piggin wrote: > > The "too expensive to check the shared queue" is one aspect of it. The > shared queue need not have events *for us* (at least, unless Jens has > changed the implementation a bit) but it can still have events that we > would need to check through. > > I don't think deadlock is a problem (any more than with multiple vectors). I'm happy with it either way, but as pointed out by Ralf, for the MIPS version of the patch there aren't even other vectors available. So sharing the vector is going to be a requirement on other architectures, maybe we should look at whether we can make it generic and peform well regardless? Linus