From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 11B73C10F29 for ; Mon, 16 Mar 2020 02:39:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CE7EA206BE for ; Mon, 16 Mar 2020 02:39:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="YldQoyfP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730434AbgCPCji (ORCPT ); Sun, 15 Mar 2020 22:39:38 -0400 Received: from mail27.static.mailgun.info ([104.130.122.27]:30765 "EHLO mail27.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729849AbgCPCje (ORCPT ); Sun, 15 Mar 2020 22:39:34 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1584326373; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=XAYV3Mbi2e454rSxwWhOjN2+9LBMzJs0h881zYPA/3g=; b=YldQoyfP7wIxMuigbNpHS2EPfVBgkLquuIzK+Nyn3LsQbD0N4CFuZRwH1lyfr4Kf2CKBW9sz rfVNTk2M8K79Cn2ZBGRgl2TSwUaQls8ewYw887wSRNJ97cLZghe/sV7lOPnV/1cZN5Ol9fGC dNuEXgUzwYK7609PoH4TLhiG/1Y= X-Mailgun-Sending-Ip: 104.130.122.27 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e6ee6da.7f0a81007148-smtp-out-n04; Mon, 16 Mar 2020 02:39:22 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 65E64C44BFA; Mon, 16 Mar 2020 02:39:21 +0000 (UTC) Received: from th-lint-038.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: psodagud) by smtp.codeaurora.org (Postfix) with ESMTPSA id 68B2DC00452; Mon, 16 Mar 2020 02:39:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 68B2DC00452 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=psodagud@codeaurora.org From: Prasad Sodagudi To: john.stultz@linaro.org, tglx@linutronix.de, sboyd@kernel.org Cc: linux-kernel@vger.kernel.org, saravanak@google.com, tsoni@codeaurora.org, tj@kernel.org, Prasad Sodagudi Subject: [PATCH 0/2] timer: make deferrable cpu unbound timers really not bound to a cpu Date: Sun, 15 Mar 2020 19:39:08 -0700 Message-Id: <1584326350-30275-1-git-send-email-psodagud@codeaurora.org> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org These patches introduce support for global deferrable timers and this feature is very useful for the mobile chipsets. There was a discussion on global deferrable timer discussion - [1] and thomas raised cacheline bouncing problem. I am thinking that, that problem is addressed on later patches problem as much as possible. Global deferrable timers runs on the tick_do_timer_cpu to avoid cacheline bouncing problem during the execution of timers. [1]- https://lore.kernel.org/patchwork/patch/500541/ Joonwoo Park (1): timer: make deferrable cpu unbound timers really not bound to a cpu Prasad Sodagudi (1): sched: Add a check for cpu unbound deferrable timers include/linux/timer.h | 3 +++ kernel/time/tick-sched.c | 6 +++++ kernel/time/timer.c | 63 ++++++++++++++++++++++++++++++++++++++++++++---- 3 files changed, 67 insertions(+), 5 deletions(-) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project