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[2620:137:e000::3:7]) by mx.google.com with ESMTPS id t2-20020a17090abc4200b0027b15e572c2si6751452pjv.21.2023.10.16.13.25.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Oct 2023 13:25:24 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) client-ip=2620:137:e000::3:7; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=IuK6iI6p; spf=pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) smtp.mailfrom=linux-nfs-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id 30B668051901; Mon, 16 Oct 2023 13:25:23 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232365AbjJPUZM (ORCPT + 99 others); Mon, 16 Oct 2023 16:25:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37570 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231955AbjJPUZM (ORCPT ); Mon, 16 Oct 2023 16:25:12 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96036B4 for ; Mon, 16 Oct 2023 13:24:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1697487864; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JSycGW65jMbt+CQATVQkWTjQSQLfxqZmVK2cIwr2iuY=; b=IuK6iI6pdqvB+HxL3Y7IW0+UGjAri5eE4Lv1ntVP7NBe47f7WV7RQ5hQP0nJtSpvauMItz K2sbR/KKXKt7eVAkPUg7R+cUIREbwoVbtZKJgg2n0NWx0q/txwiy834z8XBZ6jdR01UwZn I18IWlUS/3/LXzHSUfZJ5DNFbU5Ultc= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-629-nbMwG-KhNvqNS9cfmfR0cw-1; Mon, 16 Oct 2023 16:24:17 -0400 X-MC-Unique: nbMwG-KhNvqNS9cfmfR0cw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8F1DB3C17082; Mon, 16 Oct 2023 20:24:17 +0000 (UTC) Received: from [192.168.37.1] (unknown [10.22.48.7]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2190140C6F79; Mon, 16 Oct 2023 20:24:16 +0000 (UTC) From: Benjamin Coddington To: Trond Myklebust Cc: linux-nfs@vger.kernel.org Subject: Re: bpftrace script to monitor tasks that are stuck in NFSv4 exception loops Date: Mon, 16 Oct 2023 16:24:15 -0400 Message-ID: <6DD7E20A-1AD9-4654-B595-93A1E9585E8D@redhat.com> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Mon, 16 Oct 2023 13:25:23 -0700 (PDT) On 11 Oct 2023, at 11:15, Trond Myklebust wrote: > See attachment. Cool. Thanks for this - looks pretty similar to the systemtap stuff we u= se, but compile times are faster here. I wonder if bpftrace can do the "guru" things that systemtap can, like mo= dify the stack and memory. Seems it works with gcc too, just needed CONFIG_DEBUG_INFO_BTF=3Dy. I wi= ll play with it a bit. Ben