Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752105AbcLFCcd (ORCPT ); Mon, 5 Dec 2016 21:32:33 -0500 Received: from mail-wj0-f196.google.com ([209.85.210.196]:33598 "EHLO mail-wj0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751340AbcLFCcc (ORCPT ); Mon, 5 Dec 2016 21:32:32 -0500 From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Tony Luck , Wanpeng Li , Peter Zijlstra , Michael Ellerman , Heiko Carstens , Benjamin Herrenschmidt , Thomas Gleixner , Paul Mackerras , Ingo Molnar , Fenghua Yu , Rik van Riel , Martin Schwidefsky , Stanislaw Gruszka Subject: [PATCH 00/10] vtime: Delay cputime accounting to tick Date: Tue, 6 Dec 2016 03:32:13 +0100 Message-Id: <1480991543-6557-1-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2184 Lines: 52 This follows up Martin Schwidefsky's patch which propose to delay cputime accounting to the tick in order to minimize the calls to account_system_time() and alikes as these functions can carry quite some overhead: http://lkml.kernel.org/r/20161121111728.13a0a3db@mschwide The set includes Martin's patch, rebased on top of tip:sched/core and latest s390 changes, and extends it to the other implementations of CONFIG_VIRT_CPU_ACCOUNTING_NATIVE (powerpc and ia64) along with a few core changes to adapt the whole. Only built-tested though as I don't have access to any of these archs. git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git vtime/acc HEAD: ee6c393b212193bc01818c7cf4ae9cba3f469f00 Thanks, Frederic --- Frederic Weisbecker (9): powerpc32: Fix stale scaled stime on context switch ia64: Fix wrong start cputime assignment on task switch cputime: Allow accounting system time using cpustat index cputime: Export account_guest_time powerpc: Prepare accounting structure for cputime flush on tick powerpc: Migrate stolen_time field to accounting structure powerpc/vtime: Accumulate cputime and account only on tick/task switch ia64: Accumulate cputime and account only on tick/task switch vtime: Rename vtime_account_user() to vtime_flush() Martin Schwidefsky (1): s390/cputime: delayed accounting of system time arch/ia64/include/asm/thread_info.h | 6 ++ arch/ia64/kernel/time.c | 66 +++++++++++----- arch/powerpc/include/asm/accounting.h | 14 +++- arch/powerpc/include/asm/paca.h | 1 - arch/powerpc/kernel/asm-offsets.c | 8 +- arch/powerpc/kernel/time.c | 138 +++++++++++++++++++++------------- arch/powerpc/xmon/xmon.c | 8 +- arch/s390/include/asm/lowcore.h | 65 ++++++++-------- arch/s390/include/asm/processor.h | 3 + arch/s390/kernel/vtime.c | 116 +++++++++++++++++----------- include/linux/kernel_stat.h | 7 +- include/linux/vtime.h | 7 +- kernel/sched/cputime.c | 25 +++--- 13 files changed, 295 insertions(+), 169 deletions(-)