From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lj1-x22b.google.com (mail-lj1-x22b.google.com [IPv6:2a00:1450:4864:20::22b]) by sourceware.org (Postfix) with ESMTPS id 86CC6384404C for ; Thu, 10 Dec 2020 03:55:15 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 86CC6384404C Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=2ndquadrant.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=craig.ringer@2ndquadrant.com Received: by mail-lj1-x22b.google.com with SMTP id x23so5117819lji.7 for ; Wed, 09 Dec 2020 19:55:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=2ndquadrant-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=imZzL8zZDFUPt2o+gGRsB7Q/CBgCo+rXb1UYZV3XkYo=; b=r2jz9eNIQHCguMNQFkM4MMyqovFAZkIT1YTlEWtiUSmuDOkNwNuga5ZhDkZisg7ryx 1xaexqBbnc3M6hj1t2xvUBr3nAIS7lOZtTZRG0RRnp9pOBLecsGPI7D1s8NYFN38BoR5 GbvqX2owLgk309lR/5kNWKs6JxNCXzyoW0wYugKfKqxcmxVci0rU9X2nWUawaBmWvW9c /6dLxDe56fYolUD12eR8lEce1LrdHaMCHcIvUJy2HEYr7gg8PL8mkFmN3g/UlKmtCQwq YsYuX469bcvj+XpfgU8E2OC+3BJKhdW7qmFeqUtR5XZ8OElvfErNLZUc7Ef0y0urz35A siug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=imZzL8zZDFUPt2o+gGRsB7Q/CBgCo+rXb1UYZV3XkYo=; b=FruPbsepKnPydsm+cNdsvoCoeWCrvS0+UpaNGKeQmZNL4PgCkSQFy323KU6XXJulhy luaPbtSibnQCQCg9X+f9HyaS3qif1rN1P47pM/nO7IJ27q4arZRoll/AUhwnWswLGCBH pO/cai+UJj8URIwky6FUHmJOTrymZjzBmixcLxF+Zi00/sVlsbzGx9qcGHai1ZhP+Nb+ pcJxhpRgqpx7m/vX71AiNaXB7wUKN21AiEaUmJMeLYMGih487p0CLKAlotXP83GMDgBe O+wLMOp50hznLEpNC9ugt923EjT5MQdik13N6NcsU31iWExGvxOaBHqog879DHch9wrP /V7A== X-Gm-Message-State: AOAM533tSHl4nAh8BuaHYldOIpIsMQY0sLVUPD+92z5FLzr9EGommUua 0X252qY9fDfxA7fwbY49znO8KxuLOdmfGJ/wBNh+cQ== X-Google-Smtp-Source: ABdhPJzFepFng8ZWMBXQSCLojfah3mtP99myK8icgJ0DlJCVFlXL8EGzQA/5BU8b+1oO+Guy2kuMH70bvlmfi4oB33k= X-Received: by 2002:a2e:8602:: with SMTP id a2mr1851088lji.421.1607572514386; Wed, 09 Dec 2020 19:55:14 -0800 (PST) MIME-Version: 1.0 References: <20201110033730.GB87630@elastic.org> In-Reply-To: <20201110033730.GB87630@elastic.org> From: Craig Ringer Date: Thu, 10 Dec 2020 11:55:00 +0800 Message-ID: Subject: Re: systemtap release 4.4 To: "Frank Ch. Eigler" Cc: systemtap@sourceware.org, lwn@lwn.net, linux-kernel@vger.kernel.org X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, HTML_MESSAGE, KAM_NUMSUBJECT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: systemtap@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Systemtap mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Dec 2020 03:55:18 -0000 On Tue, 10 Nov 2020 at 11:37, Frank Ch. Eigler via Systemtap < systemtap@sourceware.org> wrote: > - The locks required to protect concurrent access to global variables > has been optimized with a "pushdown" algorithm, so that they span > the smallest possible critical region. Formerly, and with > --compatible=4.3, locks always spanned the entire probe handler. > Lock pushdown means much greater potential concurrency between > probes running on different CPUs. > Wow. That's amazing. Thankyou. -- Craig Ringer http://www.2ndQuadrant.com/ 2ndQuadrant - PostgreSQL Solutions for the Enterprise