Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751969AbaFENVX (ORCPT ); Thu, 5 Jun 2014 09:21:23 -0400 Received: from casper.infradead.org ([85.118.1.10]:52285 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750864AbaFENVW (ORCPT ); Thu, 5 Jun 2014 09:21:22 -0400 Date: Thu, 5 Jun 2014 15:21:18 +0200 From: Peter Zijlstra To: "Zhang, Yanmin" Cc: Liu ShuoX , linux-kernel@vger.kernel.org, "H. Peter Anvin" , Ingo Molnar , Zhang Yanmin Subject: Re: [PATCH] perf: fix kernel panic when parsing user space CS saved in pt_regs Message-ID: <20140605132118.GJ6758@twins.programming.kicks-ass.net> References: <20140605023610.GA12905@lskakaxi-intel> <20140605071919.GD3213@twins.programming.kicks-ass.net> <20140605073321.GA14869@lskakaxi-intel> <20140605075507.GA6758@twins.programming.kicks-ass.net> <53902398.70005@linux.intel.com> <20140605091517.GB6758@twins.programming.kicks-ass.net> <53906D78.60509@linux.intel.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="GvznHscUikHnwW2p" Content-Disposition: inline In-Reply-To: <53906D78.60509@linux.intel.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --GvznHscUikHnwW2p Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jun 05, 2014 at 09:15:36PM +0800, Zhang, Yanmin wrote: > Sorry for misleading you. It depends on backend. Pstore can use RAM or > other storage, for example, EFI-provided backend. If using EFI backend, > pstore can keep persistent across cold reset or even power outrages. >=20 > If using RAM, usually pstore can keep persistent at WarmReset. Since RAM > access (even at non-cache mode) is fast and more flexible, in fact, we of= ten use > RAM as backend of pstore. Funny definition of persistent you end up with in that case... :-) But yes, that does explain. --GvznHscUikHnwW2p Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJTkG7OAAoJEHZH4aRLwOS6DE4P/15U1+10RW3INxa8cnwyWU+W BjhYVGNdJbGFVOtJod4BQk1TBAgprTQ/Z2BzJPHUEcKKR86T3mWb7hrrinFZ63cE 7NYkxmTemyyavuTLNCYdJX+wakyfMzVNux7W6jwzsx5Mp9Ei9YTefxsfeQLZbBQs g2p3rpwBrKHIOdz8fKAhsUP2KgdfRzuaKAR9iBFAnY7XEYraFL/ImoAhwR1BTAoT hLLAGXP8mADjfjVeLGBl4+bs3kWF5IQ9fYaWsNPwFLoP5mJ/o+lXI+wMqzU3KMfJ 8vhuWCp6tA+Ijoe+KMQD4RlpBl8JONh3DsKYkyZCDgAsL9N43jLf4Kpl5r3kx5HW 7SqRbJr3DJjPxXZrdyVMPZKVv9VWypDui48KuzATZ1dowrwGWXvubW8v/ab7Ufol qwVC3Pncuoau7byPJzLkAsKPMFJOowIlBYVDWCX23VhiAbXbGvXudMT0luy9Brba C5lLoDq+WrlWhbqI4t7VKdBWigi26JM8MYGznwOzB+MgwcLY09F3R/D0/xrSorpi Xjsvb0ECjGZRMZyzdl/dqumvMIGlVZE8kwmfM+3Ywphrtf7Lxq1lBn50rDJyYWhx hGDLUD4IPXnLLMPzJSKJ+soctdDFBSGgRdFclJyMlLKs2reyyStOkrPWXARf8WMe OQoQnDXewYskzE89VFAi =BvLU -----END PGP SIGNATURE----- --GvznHscUikHnwW2p-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/