Received: by 2002:a05:6a10:8c0a:0:0:0:0 with SMTP id go10csp978383pxb; Wed, 3 Mar 2021 23:16:42 -0800 (PST) X-Google-Smtp-Source: ABdhPJxYNeo6u5r8JLPffAdCJwfU18UF3ua2NyjqXuUhjiWcayJijV0nS9xujZG8AcSAOtBTqdbQ X-Received: by 2002:a17:906:f0d0:: with SMTP id dk16mr2809333ejb.48.1614842201883; Wed, 03 Mar 2021 23:16:41 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1614842201; cv=none; d=google.com; s=arc-20160816; b=vHEq3H2hB/jcdMExSZtHTZGwW7NAtCN8mLZowMjqBoofUn+sRh6WneLubC06DKUCpO XGTOY87Pd54Y68YTbC8eZ76QjzmYO80Yf8eF5zw5CIZaJBGi9Jv0ORiu5n9zcvETqX+m Xg1L+g2uqxEMBWhzM5RhMs/pCd8jwb5c8nZj1S8JZLjtT72tuhWGTaHXw4ahUvoiQ6an 581xAdbabFlx3UrEMY2cbm+AGGiMyMSjzhTh+qMbbrjGN7mrzNUeBO6NBWJ8s+DNqlZB a2nTjy/8R2SlJBRfjkun3L2zxN+e1GktZwKWQhTu/7U8SQNntc9AoDbWguDztghdLzLf NGEA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:subject:message-id:date:from:in-reply-to :references:mime-version:dkim-signature; bh=ULh96LV2OaSrxc6KmEsgLrWL5YvhH8PzX4MGi2t/P9s=; b=H1vg/Ja1goAPvliMeRHxKHJTwBhpkUYLGFczwI/UZCRwXwUkHIgDR+A10tA8yJ8mhi I9ot3cescOLR/r5tFgrJmPr9CcLGWoNVlTltkHtFeeWk6ACQul2PP1IzcJvrk+0MThai vxqtaUl4f5GdG+Btt9gTsuqTfOij59qtMIwef5T/61x50A4dBdDVpOXuhajg1YQHAcUk x/8SZX9AiK0NIXUPse5LC1vLNziq6q2NTio+qvQjAeri1wH1dsSeVyM4lIcK5QMJfkAf /KQEXg6Otof4uHGcVXH9oTG290Obuoi17vqp5FO/dCFoGId6qqcuBoWFFrEgLDft0dgg pF7A== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=kwsrfJN4; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id g2si12914794eja.442.2021.03.03.23.16.19; Wed, 03 Mar 2021 23:16:41 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=kwsrfJN4; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2360086AbhCBWQd (ORCPT + 99 others); Tue, 2 Mar 2021 17:16:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58182 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350730AbhCBUZg (ORCPT ); Tue, 2 Mar 2021 15:25:36 -0500 Received: from mail-lj1-x235.google.com (mail-lj1-x235.google.com [IPv6:2a00:1450:4864:20::235]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7EC65C06178B; Tue, 2 Mar 2021 12:24:18 -0800 (PST) Received: by mail-lj1-x235.google.com with SMTP id k12so16655560ljg.9; Tue, 02 Mar 2021 12:24:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ULh96LV2OaSrxc6KmEsgLrWL5YvhH8PzX4MGi2t/P9s=; b=kwsrfJN4Qao4f75TPpRIUagrPr3NR40CDupm4idWUUtBseExEDxxZN7wHPeENSwVn4 j3A4BYkK0H2dTCsddMKXFx//mI2qcdU0LUymO+E7CVRwr2LTsePmtin5nlvvJKq3nsMO bFG6pzmxppMeYlF1U9N2Pgg44FVWorzn2laVHUWXlT8fGTdVkAAw/Sc7SkTH6AQLAezH kf2VjRbGeZjqvQzVkVWMWiTUM5ClWy0wtCQ+wSgyMzpRQEIMlejzWqWAnpiqMtfIVvo0 CEZp+gYsOaEWjuu4N/sbyJopv6SyHTpTcV6as7BcnziZI6Oqclp11Up7wie0gL/A1SLc 8ZpQ== 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=ULh96LV2OaSrxc6KmEsgLrWL5YvhH8PzX4MGi2t/P9s=; b=VyH046xD1HJr75CbZ32q0yzaNAIk/Rm9IbIHtdIp46u2P92BglbZX79nuQrquUhZK+ KVpKnJXPX4tpm7CKZuQaJwZwIgvZs4W9FJh60/2XABi8kQN6d0gn+kqkmZaZ2X0bEAEy HaYg6p0sZxqFPVs7742DvgFlSPmiDGnTY0FrbH+vnzlaw7fb83/5yLcgaVMAzIbVMGRU 3nXN4nuTJSdfTiJWvcpCb1BwXgVu4EcJwID6bzhUPHMgS7mRS2tiZNmJNGZkToFSBxV2 vPuS38+psedDnqg+SlgMw4hSlXlIHL1oveddQlRBU3VOdH67iUtLtoM3DmZdj+XQmgiP 5cFw== X-Gm-Message-State: AOAM531P1dllHc1Dsdh2gTPuVhm/LRHcjkVVIUdo4DGHs+xzqvRXGEeg MkRO7mj+PU5XqGm+7sVfE40XlcA7en97MXKFfhU= X-Received: by 2002:a2e:9704:: with SMTP id r4mr12697751lji.486.1614716657058; Tue, 02 Mar 2021 12:24:17 -0800 (PST) MIME-Version: 1.0 References: <20210301165130.GA5351@redhat.com> In-Reply-To: From: Alexei Starovoitov Date: Tue, 2 Mar 2021 12:24:04 -0800 Message-ID: Subject: Re: Why do kprobes and uprobes singlestep? To: Andy Lutomirski , bpf Cc: Oleg Nesterov , Masami Hiramatsu , Peter Zijlstra , LKML , Anil S Keshavamurthy , "David S. Miller" , X86 ML , Andrew Cooper Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 2, 2021 at 10:38 AM Andy Lutomirski wrote: > > Is there something like a uprobe test suite? How maintained / > actively used is uprobe? uprobe+bpf is heavily used in production. selftests/bpf has only one test for it though. Why are you asking?