Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754816AbaJGRrd (ORCPT ); Tue, 7 Oct 2014 13:47:33 -0400 Received: from p02c11o145.mxlogic.net ([208.65.144.78]:43520 "EHLO p02c11o145.mxlogic.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754371AbaJGRrc (ORCPT ); Tue, 7 Oct 2014 13:47:32 -0400 X-MXL-Hash: 5434273450d86fda-0097295a1c322b4509110493ef735dc5adebba91 X-MXL-Hash: 543426bd112971eb-b38a62dc17af49a6d21291917840771cc58c3986 Date: Tue, 7 Oct 2014 13:45:28 -0400 From: Joe Lawrence To: CC: Jiri Pirko , Tejun Heo , , Subject: Re: [PATCH v2 1/2] workqueue: add quiescent state between work items Message-ID: <20141007134528.1a59f31b@jlaw-desktop.mno.stratus.com> In-Reply-To: <20141007134329.GA4880@linux.vnet.ibm.com> References: <1412529862-17954-1-git-send-email-joe.lawrence@stratus.com> <1412529862-17954-2-git-send-email-joe.lawrence@stratus.com> <20141005192119.GE8549@htj.dyndns.org> <20141005194748.GG8549@htj.dyndns.org> <20141006042158.GW5015@linux.vnet.ibm.com> <20141007072942.GA2088@nanopsycho.orion> <20141007134329.GA4880@linux.vnet.ibm.com> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.10; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-AnalysisOut: [v=2.1 cv=Qatyv6rv c=1 sm=1 tr=0 a=o2bo05G+d1rlxuoNbFVhCw==] X-AnalysisOut: [:117 a=o2bo05G+d1rlxuoNbFVhCw==:17 a=_KQqW7t0BisA:10 a=BLc] X-AnalysisOut: [eEmwcHowA:10 a=kj9zAlcOel0A:10 a=uelBKuKpAAAA:8 a=YlVTAMxI] X-AnalysisOut: [AAAA:8 a=VnNF1IyMAAAA:8 a=oXe2fD9UkzWFrS56QJQA:9 a=CjuIK1q] X-AnalysisOut: [_8ugA:10] X-Spam: [F=0.5000000000; CM=0.500; MH=0.500(2014100712); S=0.200(2014051901)] X-MAIL-FROM: X-SOURCE-IP: [134.111.1.18] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 7 Oct 2014 06:43:29 -0700 "Paul E. McKenney" wrote: > On Tue, Oct 07, 2014 at 09:29:42AM +0200, Jiri Pirko wrote: [ ... snip ... ] > > > > Paul, Tehun, how do you propose to fix this on older kernels which do > > not have rcu_note_voluntary_context_switch? I'm particullary interested > > in 3.10. > > Hello, Jiri, > > Older kernels can instead use rcu_note_context_switch(). Hi Paul, Does 4a81e8328d37 ("rcu: Reduce overhead of cond_resched() checks for RCU") affect a backport to 3.10? I noticed that rcu_note_context_switch added a call to rcu_momentary_dyntick_idle in that change, which is only present in v3.16+. Would rcu_note_context_switch be effective by itself on a 3.10 kernel? Thanks, -- Joe -- 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/