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=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 BD8B8C33CA9 for ; Mon, 13 Jan 2020 23:30:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 905A520678 for ; Mon, 13 Jan 2020 23:30:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578958215; bh=eZaqiw319VJnCml2+zBJxKWVWM0h/GzDX6yg9g2Rquw=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=tC0tPGjx48MGYswmXFkwixytfG8z6ozQvpei4Aodnwq1iAmXl0RT400hHGrF8gH+v g66jsW5Sk7L5qKnQYaoe3vx3uflaEDfxTMGdl87GC7dmwmMLhy03N3ALE1G65H7WCu 4pJKjzGdkWcGipu4BEZK6NNcjcKTCSYQuybaDSqA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729099AbgAMXaO (ORCPT ); Mon, 13 Jan 2020 18:30:14 -0500 Received: from mail-oi1-f193.google.com ([209.85.167.193]:39897 "EHLO mail-oi1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727282AbgAMXaO (ORCPT ); Mon, 13 Jan 2020 18:30:14 -0500 Received: by mail-oi1-f193.google.com with SMTP id a67so10073685oib.6; Mon, 13 Jan 2020 15:30:13 -0800 (PST) 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=eZaqiw319VJnCml2+zBJxKWVWM0h/GzDX6yg9g2Rquw=; b=azLS09kg+Uk/fO35rdud1DlwwVzPiuH5S7OM5V8SHMM5D1fX8rwNxsfx5M1Upshs+x 0mmpxoqHrsRoGKlrc2LaQ9ALZ5Tv5iN9HBPMjsA+lijecPUDoArwpyRyjiMfX4gWYhWH tnHnmmWYyMRk32sf3/9XeSbBwTSik4C8ZZ5ujulGD44lATnZAh4e/T5O0MyTCrPF2PDB w75OLfRqIHlkMi8E0Zwu7VC+pviVK6P6BYtSeqMtWNKgENiJJbuarQ/aAwGc/ZHfzBgC HDTdjeMqkLJ8EDBoNjjiItfXwNPhsWMKGew3+TvvO1zX4ts5zBy8ovtPl32hBX+SFwpX 4Gvw== X-Gm-Message-State: APjAAAU1JDj8op1wzhwlKWHFacauqx2P6d5pm6Ko/Ch3+91PR+kVzJYW xlI/Zg5qmtDa+3YYmupKpVPTBJCiKKxNj5CHAI8= X-Google-Smtp-Source: APXvYqzg8CdbzHzyG2pmz4js9Msb/H7pbgSPntduERaOQNPUZYVj+FwHMkNAuBIckeikwPmAWFV/f2vKNieGQbmMI6k= X-Received: by 2002:a54:488d:: with SMTP id r13mr14062187oic.115.1578958213346; Mon, 13 Jan 2020 15:30:13 -0800 (PST) MIME-Version: 1.0 References: <20200107234526.GA19034@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> <20200108105011.GY2827@hirez.programming.kicks-ass.net> <20200110153520.GC8214@u40b0340c692b58f6553c.ant.amazon.com> <20200113101609.GT2844@hirez.programming.kicks-ass.net> <857b42b2e86b2ae09a23f488daada3b1b2836116.camel@amazon.com> <20200113124247.GG2827@hirez.programming.kicks-ass.net> In-Reply-To: From: "Rafael J. Wysocki" Date: Tue, 14 Jan 2020 00:30:02 +0100 Message-ID: Subject: Re: [RFC PATCH V2 11/11] x86: tsc: avoid system instability in hibernation To: Peter Zijlstra Cc: "Singh, Balbir" , "Valentin, Eduardo" , "boris.ostrovsky@oracle.com" , "linux-kernel@vger.kernel.org" , "Agarwal, Anchal" , "Woodhouse, David" , "vkuznets@redhat.com" , "sstabellini@kernel.org" , "tglx@linutronix.de" , "linux-pm@vger.kernel.org" , "linux-mm@kvack.org" , "pavel@ucw.cz" , "axboe@kernel.dk" , "x86@kernel.org" , "roger.pau@citrix.com" , "hpa@zytor.com" , "rjw@rjwysocki.net" , "mingo@redhat.com" , "Kamata, Munehisa" , "bp@alien8.de" , "netdev@vger.kernel.org" , "konrad.wilk@oracle.co" , "len.brown@intel.com" , "davem@davemloft.net" , "fllinden@amaozn.com" , "xen-devel@lists.xenproject.org" Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 13, 2020 at 10:50 PM Rafael J. Wysocki wrote: > > On Mon, Jan 13, 2020 at 1:43 PM Peter Zijlstra wrote: > > > > On Mon, Jan 13, 2020 at 11:43:18AM +0000, Singh, Balbir wrote: > > > For your original comment, just wanted to clarify the following: > > > > > > 1. After hibernation, the machine can be resumed on a different but compatible > > > host (these are VM images hibernated) > > > 2. This means the clock between host1 and host2 can/will be different > > > > > > In your comments are you making the assumption that the host(s) is/are the > > > same? Just checking the assumptions being made and being on the same page with > > > them. > > > > I would expect this to be the same problem we have as regular suspend, > > after power off the TSC will have been reset, so resume will have to > > somehow bridge that gap. I've no idea if/how it does that. > > In general, this is done by timekeeping_resume() and the only special > thing done for the TSC appears to be the tsc_verify_tsc_adjust(true) > call in tsc_resume(). And I forgot about tsc_restore_sched_clock_state() that gets called via restore_processor_state() on x86, before calling timekeeping_resume(). 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=-1.0 required=3.0 tests=MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 8B584C33CAE for ; Mon, 13 Jan 2020 23:30:16 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 57D7920678 for ; Mon, 13 Jan 2020 23:30:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 57D7920678 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C42888E0005; Mon, 13 Jan 2020 18:30:15 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BF3DF8E0003; Mon, 13 Jan 2020 18:30:15 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B08EE8E0005; Mon, 13 Jan 2020 18:30:15 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0209.hostedemail.com [216.40.44.209]) by kanga.kvack.org (Postfix) with ESMTP id 97BEF8E0003 for ; Mon, 13 Jan 2020 18:30:15 -0500 (EST) Received: from smtpin14.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 3A50940D6 for ; Mon, 13 Jan 2020 23:30:15 +0000 (UTC) X-FDA: 76374206790.14.hands06_1f29d7628d640 X-HE-Tag: hands06_1f29d7628d640 X-Filterd-Recvd-Size: 4723 Received: from mail-oi1-f193.google.com (mail-oi1-f193.google.com [209.85.167.193]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Mon, 13 Jan 2020 23:30:13 +0000 (UTC) Received: by mail-oi1-f193.google.com with SMTP id 18so10049818oin.9 for ; Mon, 13 Jan 2020 15:30:13 -0800 (PST) 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=eZaqiw319VJnCml2+zBJxKWVWM0h/GzDX6yg9g2Rquw=; b=ZBpix0IPJXFO0U4TtQbXXYFkF4uhAlh7o0JS/OvvhIVj+xNfU7dG17WONgTN2QZ2uH 3xYOObMLtKiwVl+LCU9m7X1ZF9s5VMpC1I3InlRPOukHZ3yHE0oLKDUIv4Hzf5CNs1sh rgzJ7jK4djFPfQIDlw0dIXXb/m16f7xPcsioNFlZUlJs5zErLnC/aPGVjJGdCng2y1Dh FV5OIFCJP8QHWgFJ7uy71acqXE1rbJtkL7bX+L4wydCdMV6ojx7O0qNFOk1002Er4I8G e+LX9y39+4yP2BwItzKVE0SFExdcRQq4Tzs1VOLsrZvG2KxbfEX8YKHCuZ54IaJhD/o5 IxgA== X-Gm-Message-State: APjAAAVkJHlbHbX7n0fd2U0LNY1gQ58pyzp2YB2Mn/jeywbo3C1w3iq/ rluetHp1O7hF4sK2nKdf87Fw1JiuF95iUl9FmA0= X-Google-Smtp-Source: APXvYqzg8CdbzHzyG2pmz4js9Msb/H7pbgSPntduERaOQNPUZYVj+FwHMkNAuBIckeikwPmAWFV/f2vKNieGQbmMI6k= X-Received: by 2002:a54:488d:: with SMTP id r13mr14062187oic.115.1578958213346; Mon, 13 Jan 2020 15:30:13 -0800 (PST) MIME-Version: 1.0 References: <20200107234526.GA19034@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> <20200108105011.GY2827@hirez.programming.kicks-ass.net> <20200110153520.GC8214@u40b0340c692b58f6553c.ant.amazon.com> <20200113101609.GT2844@hirez.programming.kicks-ass.net> <857b42b2e86b2ae09a23f488daada3b1b2836116.camel@amazon.com> <20200113124247.GG2827@hirez.programming.kicks-ass.net> In-Reply-To: From: "Rafael J. Wysocki" Date: Tue, 14 Jan 2020 00:30:02 +0100 Message-ID: Subject: Re: [RFC PATCH V2 11/11] x86: tsc: avoid system instability in hibernation To: Peter Zijlstra Cc: "Singh, Balbir" , "Valentin, Eduardo" , "boris.ostrovsky@oracle.com" , "linux-kernel@vger.kernel.org" , "Agarwal, Anchal" , "Woodhouse, David" , "vkuznets@redhat.com" , "sstabellini@kernel.org" , "tglx@linutronix.de" , "linux-pm@vger.kernel.org" , "linux-mm@kvack.org" , "pavel@ucw.cz" , "axboe@kernel.dk" , "x86@kernel.org" , "roger.pau@citrix.com" , "hpa@zytor.com" , "rjw@rjwysocki.net" , "mingo@redhat.com" , "Kamata, Munehisa" , "bp@alien8.de" , "netdev@vger.kernel.org" , "konrad.wilk@oracle.co" , "len.brown@intel.com" , "davem@davemloft.net" , "fllinden@amaozn.com" , "xen-devel@lists.xenproject.org" Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Jan 13, 2020 at 10:50 PM Rafael J. Wysocki wrote: > > On Mon, Jan 13, 2020 at 1:43 PM Peter Zijlstra wrote: > > > > On Mon, Jan 13, 2020 at 11:43:18AM +0000, Singh, Balbir wrote: > > > For your original comment, just wanted to clarify the following: > > > > > > 1. After hibernation, the machine can be resumed on a different but compatible > > > host (these are VM images hibernated) > > > 2. This means the clock between host1 and host2 can/will be different > > > > > > In your comments are you making the assumption that the host(s) is/are the > > > same? Just checking the assumptions being made and being on the same page with > > > them. > > > > I would expect this to be the same problem we have as regular suspend, > > after power off the TSC will have been reset, so resume will have to > > somehow bridge that gap. I've no idea if/how it does that. > > In general, this is done by timekeeping_resume() and the only special > thing done for the TSC appears to be the tsc_verify_tsc_adjust(true) > call in tsc_resume(). And I forgot about tsc_restore_sched_clock_state() that gets called via restore_processor_state() on x86, before calling timekeeping_resume(). 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=-1.0 required=3.0 tests=MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 6E3E6C33CA9 for ; Mon, 13 Jan 2020 23:30:42 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 465AB20678 for ; Mon, 13 Jan 2020 23:30:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 465AB20678 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1ir9A8-0008TZ-1D; Mon, 13 Jan 2020 23:30:24 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1ir9A6-0008TT-B7 for xen-devel@lists.xenproject.org; Mon, 13 Jan 2020 23:30:22 +0000 X-Inumbo-ID: a5e47dec-365c-11ea-b89f-bc764e2007e4 Received: from mail-oi1-f193.google.com (unknown [209.85.167.193]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id a5e47dec-365c-11ea-b89f-bc764e2007e4; Mon, 13 Jan 2020 23:30:13 +0000 (UTC) Received: by mail-oi1-f193.google.com with SMTP id z64so10089442oia.4 for ; Mon, 13 Jan 2020 15:30:13 -0800 (PST) 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=eZaqiw319VJnCml2+zBJxKWVWM0h/GzDX6yg9g2Rquw=; b=Qe4BqpuYY7cJYK8XzA7mQYD6+RVWkX6peIvFdddmbLLTzxc/4U5imRmq4KlUJ8dpbK mbc0EVGq7H9wKxoZMaqk3C1r8dH31t+vL3BwQV+177/jEK4PlzwySZyA+7UvS3aye3dw K7RBWLETf+LPXLo/wTGhyUHm4eJi4p1yCHRDpO0ZDJzqkhSKvQrv/6lAmv6+VEvE46GA 7NxkGRiknWnmp4R6PSiYGRB+lIm4jr5D2K0Emz82mzoyYMcdmdcXxdsy8ZOTAuOzvhqk sEho1XSrnx2SFj1SYvqshHnx/YMEu9a/uu5zh5aiWWwP0OBboAUlsKohwPYaGcuf3aI7 XvaA== X-Gm-Message-State: APjAAAUzjq888yBNAKEpV9IHh9USkByycbVIpcAsgG7mtGSldbYLdl9Q 3NlGtzDHIYthOnQmzUxqtHhNeZpBEcauHJycMkY= X-Google-Smtp-Source: APXvYqzg8CdbzHzyG2pmz4js9Msb/H7pbgSPntduERaOQNPUZYVj+FwHMkNAuBIckeikwPmAWFV/f2vKNieGQbmMI6k= X-Received: by 2002:a54:488d:: with SMTP id r13mr14062187oic.115.1578958213346; Mon, 13 Jan 2020 15:30:13 -0800 (PST) MIME-Version: 1.0 References: <20200107234526.GA19034@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> <20200108105011.GY2827@hirez.programming.kicks-ass.net> <20200110153520.GC8214@u40b0340c692b58f6553c.ant.amazon.com> <20200113101609.GT2844@hirez.programming.kicks-ass.net> <857b42b2e86b2ae09a23f488daada3b1b2836116.camel@amazon.com> <20200113124247.GG2827@hirez.programming.kicks-ass.net> In-Reply-To: From: "Rafael J. Wysocki" Date: Tue, 14 Jan 2020 00:30:02 +0100 Message-ID: To: Peter Zijlstra Subject: Re: [Xen-devel] [RFC PATCH V2 11/11] x86: tsc: avoid system instability in hibernation X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: "konrad.wilk@oracle.co" , "Kamata, Munehisa" , "linux-mm@kvack.org" , "pavel@ucw.cz" , "hpa@zytor.com" , "boris.ostrovsky@oracle.com" , "sstabellini@kernel.org" , "fllinden@amaozn.com" , "Valentin, Eduardo" , "x86@kernel.org" , "mingo@redhat.com" , "xen-devel@lists.xenproject.org" , "Singh, Balbir" , "len.brown@intel.com" , "linux-pm@vger.kernel.org" , "Agarwal, Anchal" , "bp@alien8.de" , "tglx@linutronix.de" , "axboe@kernel.dk" , "netdev@vger.kernel.org" , "rjw@rjwysocki.net" , "linux-kernel@vger.kernel.org" , "vkuznets@redhat.com" , "davem@davemloft.net" , "Woodhouse, David" , "roger.pau@citrix.com" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" T24gTW9uLCBKYW4gMTMsIDIwMjAgYXQgMTA6NTAgUE0gUmFmYWVsIEouIFd5c29ja2kgPHJhZmFl bEBrZXJuZWwub3JnPiB3cm90ZToKPgo+IE9uIE1vbiwgSmFuIDEzLCAyMDIwIGF0IDE6NDMgUE0g UGV0ZXIgWmlqbHN0cmEgPHBldGVyekBpbmZyYWRlYWQub3JnPiB3cm90ZToKPiA+Cj4gPiBPbiBN b24sIEphbiAxMywgMjAyMCBhdCAxMTo0MzoxOEFNICswMDAwLCBTaW5naCwgQmFsYmlyIHdyb3Rl Ogo+ID4gPiBGb3IgeW91ciBvcmlnaW5hbCBjb21tZW50LCBqdXN0IHdhbnRlZCB0byBjbGFyaWZ5 IHRoZSBmb2xsb3dpbmc6Cj4gPiA+Cj4gPiA+IDEuIEFmdGVyIGhpYmVybmF0aW9uLCB0aGUgbWFj aGluZSBjYW4gYmUgcmVzdW1lZCBvbiBhIGRpZmZlcmVudCBidXQgY29tcGF0aWJsZQo+ID4gPiBo b3N0ICh0aGVzZSBhcmUgVk0gaW1hZ2VzIGhpYmVybmF0ZWQpCj4gPiA+IDIuIFRoaXMgbWVhbnMg dGhlIGNsb2NrIGJldHdlZW4gaG9zdDEgYW5kIGhvc3QyIGNhbi93aWxsIGJlIGRpZmZlcmVudAo+ ID4gPgo+ID4gPiBJbiB5b3VyIGNvbW1lbnRzIGFyZSB5b3UgbWFraW5nIHRoZSBhc3N1bXB0aW9u IHRoYXQgdGhlIGhvc3QocykgaXMvYXJlIHRoZQo+ID4gPiBzYW1lPyBKdXN0IGNoZWNraW5nIHRo ZSBhc3N1bXB0aW9ucyBiZWluZyBtYWRlIGFuZCBiZWluZyBvbiB0aGUgc2FtZSBwYWdlIHdpdGgK PiA+ID4gdGhlbS4KPiA+Cj4gPiBJIHdvdWxkIGV4cGVjdCB0aGlzIHRvIGJlIHRoZSBzYW1lIHBy b2JsZW0gd2UgaGF2ZSBhcyByZWd1bGFyIHN1c3BlbmQsCj4gPiBhZnRlciBwb3dlciBvZmYgdGhl IFRTQyB3aWxsIGhhdmUgYmVlbiByZXNldCwgc28gcmVzdW1lIHdpbGwgaGF2ZSB0bwo+ID4gc29t ZWhvdyBicmlkZ2UgdGhhdCBnYXAuIEkndmUgbm8gaWRlYSBpZi9ob3cgaXQgZG9lcyB0aGF0Lgo+ Cj4gSW4gZ2VuZXJhbCwgdGhpcyBpcyBkb25lIGJ5IHRpbWVrZWVwaW5nX3Jlc3VtZSgpIGFuZCB0 aGUgb25seSBzcGVjaWFsCj4gdGhpbmcgZG9uZSBmb3IgdGhlIFRTQyBhcHBlYXJzIHRvIGJlIHRo ZSB0c2NfdmVyaWZ5X3RzY19hZGp1c3QodHJ1ZSkKPiBjYWxsIGluIHRzY19yZXN1bWUoKS4KCkFu ZCBJIGZvcmdvdCBhYm91dCB0c2NfcmVzdG9yZV9zY2hlZF9jbG9ja19zdGF0ZSgpIHRoYXQgZ2V0 cyBjYWxsZWQKdmlhIHJlc3RvcmVfcHJvY2Vzc29yX3N0YXRlKCkgb24geDg2LCBiZWZvcmUgY2Fs bGluZwp0aW1la2VlcGluZ19yZXN1bWUoKS4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxpc3Rz LnhlbnByb2plY3Qub3JnCmh0dHBzOi8vbGlzdHMueGVucHJvamVjdC5vcmcvbWFpbG1hbi9saXN0 aW5mby94ZW4tZGV2ZWw=