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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 90B6EC43381 for ; Fri, 22 Feb 2019 10:35:23 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 1AD4F20652 for ; Fri, 22 Feb 2019 10:35:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1AD4F20652 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 445SQx28MbzDqDb for ; Fri, 22 Feb 2019 21:35:21 +1100 (AEDT) Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 445RNN4fygzDq7k for ; Fri, 22 Feb 2019 20:48:04 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: by ozlabs.org (Postfix, from userid 1034) id 445RNM72H2z9sDX; Fri, 22 Feb 2019 20:48:03 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: cabe8138b23c92e851b92c6a20ffb13598ff34d4 X-Patchwork-Hint: ignore In-Reply-To: <9afb42b9d78abe00fe049e1736a180b1facdfd86.1550490186.git.christophe.leroy@c-s.fr> To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras From: Michael Ellerman Subject: Re: powerpc: dump as a single line areas mapping a single physical page. Message-Id: <445RNM72H2z9sDX@ozlabs.org> Date: Fri, 22 Feb 2019 20:48:03 +1100 (AEDT) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, 2019-02-18 at 12:25:20 UTC, Christophe Leroy wrote: > When using KASAN, there are parts of the shadow area where all > pages are mapped to the kasan_early_shadow_page. It is pointless > to dump one line for each of those pages (in the example below there > are 7168 entries pointing to the same physical page). > > ~# cat /sys/kernel/debug/kernel_page_tables > ... > ---[ kasan shadow mem start ]--- > 0xf7c00000-0xf8bfffff 0x06fac000 16M rw present dirty accessed > 0xf8c00000-0xf8c03fff 0x00cd0000 16K r present dirty accessed > 0xf8c04000-0xf8c07fff 0x00cd0000 16K r present dirty accessed > 0xf8c08000-0xf8c0bfff 0x00cd0000 16K r present dirty accessed > 0xf8c0c000-0xf8c0ffff 0x00cd0000 16K r present dirty accessed > 0xf8c10000-0xf8c13fff 0x00cd0000 16K r present dirty accessed > ... 7168 identical lines > 0xffbfc000-0xffbfffff 0x00cd0000 16K r present dirty accessed > ---[ kasan shadow mem end ]--- > ... > > This patch modifies linux table dump to dump as a single line areas > where all addresses points to the same physical page. That physical > address is put inside [] to show that all virt pages points to the > same phys page. > > ~# cat /sys/kernel/debug/kernel_page_tables > ... > ---[ kasan shadow mem start ]--- > 0xf7c00000-0xf8bfffff 0x06fac000 16M rw present dirty accessed > 0xf8c00000-0xffbfffff [0x00cd0000] 16K r present dirty accessed > ---[ kasan shadow mem end ]--- > ... > > Signed-off-by: Christophe Leroy Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/cabe8138b23c92e851b92c6a20ffb135 cheers