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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 F3655C432C3 for ; Thu, 14 Nov 2019 13:14:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CEE312071F for ; Thu, 14 Nov 2019 13:14:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="H8kXXk4c" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726473AbfKNNOo (ORCPT ); Thu, 14 Nov 2019 08:14:44 -0500 Received: from merlin.infradead.org ([205.233.59.134]:49226 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726139AbfKNNOo (ORCPT ); Thu, 14 Nov 2019 08:14:44 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=He7TZydBqJdm6j9sMwQxIx5OY+kOVIAf9OOyvnsEo8I=; b=H8kXXk4c0DwI4SMpC88yvWlam G0t6uhkTWxOyi9P4Pv/0bY/6oagZlpCILgiPEI6osgCmOuD2BWKkijjFF6YrGWUZjFr23c1hDWg3N D6fTelb8eVI9h5qIKkP26X4UAmcJfKMi2N6RuOJF7QzaBqwN3DoVjWxM4jkqeD7XHAnW8zc7NWANi nFnBKj0RnSAwMyObNRjVbHvLO7jKgfDVp0J9LtN19xmYVIcr96WDk6LQxUHL8ey4yLHDe0Q4Y8jkd l/bwbFVmItcuydLKrrYdWcco07I2BBOR17Tlv9upt1Y4cUgcPsLrOHAfpKHIFRjXCFcwSmVPy00xl OO4J1sI8g==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iVExH-0006vR-Vb; Thu, 14 Nov 2019 13:14:36 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id DF8F5301120; Thu, 14 Nov 2019 14:13:26 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 93E2829E032D8; Thu, 14 Nov 2019 14:14:34 +0100 (CET) Date: Thu, 14 Nov 2019 14:14:34 +0100 From: Peter Zijlstra To: Ming Lei Cc: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-kernel@vger.kernel.org, Jeff Moyer , Dave Chinner , Eric Sandeen , Christoph Hellwig , Jens Axboe , Ingo Molnar , Tejun Heo Subject: Re: single aio thread is migrated crazily by scheduler Message-ID: <20191114131434.GQ4114@hirez.programming.kicks-ass.net> References: <20191114113153.GB4213@ming.t460p> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191114113153.GB4213@ming.t460p> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Thu, Nov 14, 2019 at 07:31:53PM +0800, Ming Lei wrote: > Hi Guys, > > It is found that single AIO thread is migrated crazely by scheduler, and > the migrate period can be < 10ms. Follows the test a): What does crazy mean? Does it cycle through the L3 mask?