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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 69C18C369D3 for ; Wed, 23 Apr 2025 09:46:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CFCFB6B0083; Wed, 23 Apr 2025 05:46:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CAB5A6B0089; Wed, 23 Apr 2025 05:46:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B4DEA6B00A5; Wed, 23 Apr 2025 05:46:10 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 924806B0083 for ; Wed, 23 Apr 2025 05:46:10 -0400 (EDT) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 1B4C5121E3C for ; Wed, 23 Apr 2025 09:46:11 +0000 (UTC) X-FDA: 83364827742.11.9F9FE83 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf01.hostedemail.com (Postfix) with ESMTP id 05CFF4000F for ; Wed, 23 Apr 2025 09:46:08 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=BgzMpl+w; spf=pass (imf01.hostedemail.com: domain of fweimer@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=fweimer@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1745401569; h=from:from:sender: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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=AGjuoh4qYogPJYswaAiEUROsXAnPjVmc98rcaYTzsnM=; b=rgPwVUhQxE/WwXo12+J/2ZL76NxkxK9tJbcq3VmVJE2XvuzHsWg9DUWp7Z5d79SMm4VtZ1 uGW7x4c3si5ax+jI8YyN9XZgQFyn4DdPnEw6JksDUMHE4mdVUWY1HyM5NcZbZJLuNt04fE VM6f/uwrKOo/tN72hrLJ4TXr4CcDQy0= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=BgzMpl+w; spf=pass (imf01.hostedemail.com: domain of fweimer@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=fweimer@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1745401569; a=rsa-sha256; cv=none; b=ZHlmdSapZ9snweQZcjZemMozePjLyJNxf3L1mcm7oDKwk6xsnVG2SIO5FVprskYdWmvXUx iAkXWkIdV59Tr0Fv8yuYH/oY47Flw3AFkbF07crpmYbJmm6hxnEe/sm2sOKLNM07SqRhxi nxCngMcgw1bHRYcXvVqUWodDLH6C7X8= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1745401568; 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: in-reply-to:in-reply-to:references:references; bh=AGjuoh4qYogPJYswaAiEUROsXAnPjVmc98rcaYTzsnM=; b=BgzMpl+w66qUfAcC1amqLp0j0r2p/puRgxZOuGu3JDlvtaqYjseFzYq8UoUd2Cga6kuN+/ 4kk3Z226ayDoHcUYagE7WRTRoCC4b7Bdt3NBGABxfFNZyPqns/p90gijMyGG+8A5NRN4vF hDS3NTf5FK5CXlo4KGB7mjGCrCPzLT8= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-211-B-36XaJbPS6UJ5Flly-XWA-1; Wed, 23 Apr 2025 05:46:04 -0400 X-MC-Unique: B-36XaJbPS6UJ5Flly-XWA-1 X-Mimecast-MFC-AGG-ID: B-36XaJbPS6UJ5Flly-XWA_1745401562 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 7C11E1800ECC; Wed, 23 Apr 2025 09:46:01 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.2.16.172]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 7C4191956095; Wed, 23 Apr 2025 09:45:56 +0000 (UTC) From: Florian Weimer To: Ye Liu Cc: akpm@linux-foundation.org, linux-debuggers@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-toolchains@vger.kernel.org, osandov@osandov.com, paulmck@kernel.org, sweettea-kernel@dorminy.me, liuye@kylinos.cn Subject: Re: [PATCH v3] tools/mm: Add script to display page state for a given PID and VADDR In-Reply-To: <20250423014850.344501-1-ye.liu@linux.dev> (Ye Liu's message of "Wed, 23 Apr 2025 09:48:50 +0800") References: <20250423014850.344501-1-ye.liu@linux.dev> Date: Wed, 23 Apr 2025 11:45:53 +0200 Message-ID: <87jz7bky7i.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 X-Stat-Signature: khikbhh5rofj9bobbh1c54x8pgp91xhi X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 05CFF4000F X-Rspam-User: X-HE-Tag: 1745401568-191441 X-HE-Meta: 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 9Khtx4zb Dga2p5PfNOBMJKC0ZdISQtshWVYPUMgLpq9Qauav/ez7B9H4LsDLdkexMYLhXXt4pidn087UhFDy3wxFAW1dCSkzAjgC3CAGdylK8Gyzt6ljvNRj77/mxhqY34muy4eoG1NqOnkSPaCJQT2jRAbg92StzM7hXv5wwGm8R4vSGLxQ23DH7MA3hI+m0lpkF0j1FIuEWXzOdBJPmMb/cqqLnidxns3fh9fKRGRyQ/0VcY0JrmBE= 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: List-Subscribe: List-Unsubscribe: * Ye Liu: > From: Ye Liu > > Introduces a new drgn script, `show_page_info.py`, which allows users > to analyze the state of a page given a process ID (PID) and a virtual > address (VADDR). This can help kernel developers or debuggers easily > inspect page-related information in a live kernel or vmcore. > > The script extracts information such as the page flags, mapping, and > other metadata relevant to diagnosing memory issues. > > Output example: > sudo ./show_page_info.py 1 0x7f43df5acf00 > PID: 1 Comm: systemd mm: 0xffff8881273bbc40 > Raw: 0017ffffc000416c ffffea00043a4508 ffffea0004381e08 ffff88810f086a70 > Raw: 0000000000000000 ffff888120c9b0c0 0000002500000007 ffff88812642c000 > User Virtual Address: 0x7f43df5acf00 > Page Address: 0xffffea00049a0b00 > Page Flags: PG_referenced|PG_uptodate|PG_lru|PG_head|PG_active| > PG_private|PG_reported > Page Size: 16384 > Page PFN: 0x12682c > Page Physical: 0x12682c000 > Page Virtual: 0xffff88812682c000 > Page Refcount: 37 > Page Mapcount: 7 > Page Index: 0x0 > Page Memcg Data: 0xffff88812642c000 > Memcg Name: init.scope > Memcg Path: /sys/fs/cgroup/memory/init.scope > Page Mapping: 0xffff88810f086a70 > Page Anon/File: File > Page VMA: 0xffff88810e4af3b8 > VMA Start: 0x7f43df5ac000 > VMA End: 0x7f43df5b0000 > This page is part of a compound page. > This page is the head page of a compound page. > Head Page: 0xffffea00049a0b00 > Compound Order: 2 > Number of Pages: 4 Does this show the page access flags anywhere in the output? If not, would it be possible to include this information? Thanks, Florian