Received: by 2002:a25:1506:0:0:0:0:0 with SMTP id 6csp6099669ybv; Tue, 18 Feb 2020 09:52:43 -0800 (PST) X-Google-Smtp-Source: APXvYqxNyLLNptEoUQKjO1ySiW7USNvrjh0FJe/yxkIdiuRBTnIc1cXThz2xHNMBU1b9nmZaRv58 X-Received: by 2002:aca:2407:: with SMTP id n7mr2058665oic.14.1582048363138; Tue, 18 Feb 2020 09:52:43 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1582048363; cv=none; d=google.com; s=arc-20160816; b=Oaj/PisAon3OSKFvpJ6DVDRVWDN7nJO7NU+n+cq79DLxwFlOXmvgRIm/P4o5Bg3WQD Hlf9vE9wFWARvGBildr/YghVIYY6+RYSVmgYhyK2hNOfx51y2UrfQUuaH7Stk2BtNXoR 4fqka1TFr0VrU52519hChsGLW+cjXasDJ77PATTqLu0HAI6CCcT2Sl2AUGOS50WgDaUs IDunjF9bpy81d4rw0SsQJ3gDMdA7/IZ/izY7vc9ij+9LwVgzUKp7pdpPU/CPGNriR2fy xjpV7fvLzVQ+hdGAagR1yzpZ0RPrA9CfzQoOhy6RNguchogjUDJEteCkYgRbf/627s1L IItw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=qcUGmfv3It6WXjRuEWpB3waGDzv5AysX2x7HNbHJ9MM=; b=DSTkXMNH5uUltCl1l55vGrPKMqGjtXS99wEUYr7Xh2Duc2JJ7Uolt1TNpKda8qvCFw dav67ppvGsO81aI93bCgMHxYJUoDMImakkxXjWQEUdHdwIKIMYUydG6W3MM7JmvNhn0n rDFqB4pIyhklQjFGp+ZEDggtsodJqXOY/LcwpZ/w8ez0Yn/kRryT9NfB2J9bQHbQV4HD fciIF08oxGouaNMb8GGjyUgZEeFRo4XZecpTUP0CkzP2GfvMFx//doyuVXX9Vvk7yLF5 Pi58dNrk/mOY1slTthM1G8W6QhCznkkWZCoi9ukfTqhAzz+cqHs+AY7C6KVPeiEGCKoJ Lzcg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id d1si2054907oth.158.2020.02.18.09.52.29; Tue, 18 Feb 2020 09:52:43 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726551AbgBRRv7 (ORCPT + 99 others); Tue, 18 Feb 2020 12:51:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:35424 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726411AbgBRRv7 (ORCPT ); Tue, 18 Feb 2020 12:51:59 -0500 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7690824654; Tue, 18 Feb 2020 17:51:58 +0000 (UTC) Date: Tue, 18 Feb 2020 12:51:57 -0500 From: Steven Rostedt To: Masami Hiramatsu Cc: Luigi Rizzo , linux-kernel@vger.kernel.org, naveen.n.rao@linux.ibm.com, anil.s.keshavamurthy@intel.com, davem@davemloft.net, gregkh@linuxfoundation.org, Ingo Molnar Subject: Re: [PATCH v3] kretprobe: percpu support Message-ID: <20200218125157.022b459a@gandalf.local.home> In-Reply-To: <20200218165529.39e761c4be828285cc060279@kernel.org> References: <20200218005659.91318-1-lrizzo@google.com> <20200218165529.39e761c4be828285cc060279@kernel.org> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 18 Feb 2020 16:55:29 +0900 Masami Hiramatsu wrote: > Racy lock is the kretprobe_hash_lock(), I would like to replace it > with ftrace's per-task shadow stack. But that will be available > only if CONFIG_FUNCTION_GRAPH_TRACER=y (and instance has no own > payload). I need to start that work up again (soon) and get that finished. :-/ -- Steve