Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754043AbbBEUYA (ORCPT ); Thu, 5 Feb 2015 15:24:00 -0500 Received: from shelob.surriel.com ([74.92.59.67]:47356 "EHLO shelob.surriel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751383AbbBEUX4 (ORCPT ); Thu, 5 Feb 2015 15:23:56 -0500 From: riel@redhat.com To: kvm@vger.kernel.org Cc: borntraeger@de.ibm.com, linux-kernel@vger.kernel.org, mtosatti@redhat.com, mingo@kernel.orgm, ak@linux.intel.com, oleg@redhat.com, masami.hiramatsu.pt@hitachi.com, fweisbec@gmail.com, paulmck@linux.vnet.ibm.com, lcapitulino@redhat.com, pbonzini@redhat.com Subject: [PATCH 2/5] rcu,nohz: run vtime_user_enter/exit only when state == IN_USER Date: Thu, 5 Feb 2015 15:23:49 -0500 Message-Id: <1423167832-17609-3-git-send-email-riel@redhat.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1423167832-17609-1-git-send-email-riel@redhat.com> References: <1423167832-17609-1-git-send-email-riel@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1477 Lines: 45 From: Rik van Riel Only run vtime_user_enter and vtime_user_exit when we are entering or exiting user state, respectively. The RCU code only distinguishes between "idle" and "not idle or kernel". There should be no need to add an additional (unused) state there. Signed-off-by: Rik van Riel --- kernel/context_tracking.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c index 4c010787c9ec..97806c4deec5 100644 --- a/kernel/context_tracking.c +++ b/kernel/context_tracking.c @@ -85,7 +85,8 @@ void context_tracking_user_enter(enum ctx_state state) * user_exit() or rcu_irq_enter(). Let's remove RCU's dependency * on the tick. */ - vtime_user_enter(current); + if (state == IN_USER) + vtime_user_enter(current); rcu_user_enter(); } /* @@ -136,7 +137,8 @@ void context_tracking_user_exit(enum ctx_state state) * RCU core about that (ie: we may need the tick again). */ rcu_user_exit(); - vtime_user_exit(current); + if (state == IN_USER) + vtime_user_exit(current); trace_user_exit(0); } __this_cpu_write(context_tracking.state, IN_KERNEL); -- 1.9.3 -- 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/