From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S942148AbdAJPT5 (ORCPT ); Tue, 10 Jan 2017 10:19:57 -0500 Received: from mail-wm0-f65.google.com ([74.125.82.65]:33999 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S937854AbdAJPTx (ORCPT ); Tue, 10 Jan 2017 10:19:53 -0500 From: Frederic Weisbecker To: Ingo Molnar , Thomas Gleixner Cc: LKML , Frederic Weisbecker , Tony Luck , Wanpeng Li , Peter Zijlstra , Michael Ellerman , Heiko Carstens , Benjamin Herrenschmidt , Paul Mackerras , Christian Borntraeger , Fenghua Yu , Rik van Riel , Martin Schwidefsky , Stanislaw Gruszka Subject: [GIT PULL] vtime: Delay cputime accounting to tick / context switch Date: Tue, 10 Jan 2017 16:19:46 +0100 Message-Id: <1484061586-7245-1-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 Ingo, Thomas, Please pull the vtime/accumulate-for-tip branch that can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git vtime/accumulate-for-tip HEAD: 0fe66425659da25269280c106f39b333a0cfb9a9 --- The cputime accounting functions (account_system_time(), account_user_time(), ...) happen to be costly especially under several common configs. And with CONFIG_VIRT_CPU_ACCOUNTING_NATIVE those functions are called on many fast paths such as context boundaries like user <-> kernel, kernel <-> guest, kernel <-> idle, kernel <-> (soft)IRQ, context switches, etc... This set reduces this overhead by accumulating the cputime on context boundaries and eventually delay the accounting of that accumulated time on ticks and context switches only. --- 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 | 138 ++++++++++++++++++++++------------ include/linux/kernel_stat.h | 5 +- include/linux/vtime.h | 7 +- kernel/sched/cputime.c | 16 ++-- 13 files changed, 302 insertions(+), 173 deletions(-)