From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964988AbbFJRab (ORCPT ); Wed, 10 Jun 2015 13:30:31 -0400 Received: from mail-wi0-f179.google.com ([209.85.212.179]:33547 "EHLO mail-wi0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964892AbbFJRaY (ORCPT ); Wed, 10 Jun 2015 13:30:24 -0400 Message-ID: <1433957421.6306.28.camel@gmail.com> Subject: Re: RFC: futex_wait() can DoS the tick From: Mike Galbraith To: Thomas Gleixner Cc: LKML , Peter Zijlstra , Ingo Molnar , Steven Rostedt Date: Wed, 10 Jun 2015 19:30:21 +0200 In-Reply-To: References: <1433940278.6814.66.camel@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.11 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2015-06-10 at 17:12 +0200, Thomas Gleixner wrote: > Some more information about your symptoms in form of configuration, > extra patches, kernel traces etc. would be appreciated. homer:~/tmp # perf record -C 3 -eirq:*,irq_vectors:local* -- sleep 10 [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 1380.507 MB perf.data (19530595 samples) ] homer:~/tmp # perf script | grep irq_vectors:local_timer ksoftirqd/3 19 [003] 5586.564238: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5586.564239: irq_vectors:local_timer_exit: vector=239 ksoftirqd/3 19 [003] 5586.568238: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5586.568239: irq_vectors:local_timer_exit: vector=239 ksoftirqd/3 19 [003] 5586.632218: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5586.632219: irq_vectors:local_timer_exit: vector=239 bnc886785_livel 9817 [003] 5587.056069: irq_vectors:local_timer_entry: vector=239 bnc886785_livel 9817 [003] 5587.056071: irq_vectors:local_timer_exit: vector=239 ksoftirqd/3 19 [003] 5587.307978: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5587.307978: irq_vectors:local_timer_exit: vector=239 ksoftirqd/3 19 [003] 5588.255633: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5588.255635: irq_vectors:local_timer_exit: vector=239 ksoftirqd/3 19 [003] 5589.627132: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5589.627133: irq_vectors:local_timer_exit: vector=239 bnc886785_livel 9817 [003] 5590.334877: irq_vectors:local_timer_entry: vector=239 bnc886785_livel 9817 [003] 5590.334883: irq_vectors:local_timer_exit: vector=239 bnc886785_livel 9817 [003] 5590.510815: irq_vectors:local_timer_entry: vector=239 bnc886785_livel 9817 [003] 5590.510816: irq_vectors:local_timer_exit: vector=239 ksoftirqd/3 19 [003] 5590.558794: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5590.558796: irq_vectors:local_timer_exit: vector=239 bnc886785_livel 9817 [003] 5590.822707: irq_vectors:local_timer_entry: vector=239 bnc886785_livel 9817 [003] 5590.822709: irq_vectors:local_timer_exit: vector=239 ksoftirqd/3 19 [003] 5592.346152: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5592.346153: irq_vectors:local_timer_exit: vector=239 bnc886785_livel 9817 [003] 5592.558074: irq_vectors:local_timer_entry: vector=239 bnc886785_livel 9817 [003] 5592.558076: irq_vectors:local_timer_exit: vector=239 bnc886785_livel 9817 [003] 5593.741647: irq_vectors:local_timer_entry: vector=239 bnc886785_livel 9817 [003] 5593.741649: irq_vectors:local_timer_exit: vector=239 ksoftirqd/3 19 [003] 5594.953208: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5594.953209: irq_vectors:local_timer_exit: vector=239 bnc886785_livel 9817 [003] 5595.009197: irq_vectors:local_timer_entry: vector=239 bnc886785_livel 9817 [003] 5595.009198: irq_vectors:local_timer_exit: vector=239 ksoftirqd/3 19 [003] 5595.397049: irq_vectors:local_timer_entry: vector=239 ksoftirqd/3 19 [003] 5595.397050: irq_vectors:local_timer_exit: vector=239 bnc886785_livel 9817 [003] 5595.473025: irq_vectors:local_timer_entry: vector=239 bnc886785_livel 9817 [003] 5595.473027: irq_vectors:local_timer_exit: vector=239 homer:~/tmp #