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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B329CC43458 for ; Wed, 1 Jul 2026 01:23:14 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4B7426B00A9; Tue, 30 Jun 2026 21:23:13 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 467AB6B00AB; Tue, 30 Jun 2026 21:23:13 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 309916B00AC; Tue, 30 Jun 2026 21:23:13 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id DB1BC6B00A9 for ; Tue, 30 Jun 2026 21:23:12 -0400 (EDT) Received: from smtpin20.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 477C2A01B9 for ; Wed, 1 Jul 2026 01:23:11 +0000 (UTC) X-FDA: 84938459382.20.E1FF1C9 Received: from out-180.mta0.migadu.com (out-180.mta0.migadu.com [91.218.175.180]) by imf16.hostedemail.com (Postfix) with ESMTP id 88C0018000B for ; Wed, 1 Jul 2026 01:23:08 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=XopNAdgM; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf16.hostedemail.com: domain of ye.liu@linux.dev designates 91.218.175.180 as permitted sender) smtp.mailfrom=ye.liu@linux.dev ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1782868988; b=NdYTn71lGm/lA035H48i6fisz/zgjUX94xFXI6koUW269MgXTQbvc5SFRsPn14UClcqn7i hhD8Or3B58ri6UrcCwKA6x+op3sYKR3V41UxYdnzwOrIhlBVkymQkkdt+yhQ/61qI1F19F KfM3ONniOW9q/3bQub/BlMYDWl5ftT8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1782868988; 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-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=9Uz52W8u4KLE/aWGQJH75bXXpHks/NCvUx2zWmpBg4g=; b=sFnxCNXnGnPdEzkZQbwk15/HhPP0ilZXYpmKfFmEIYfAMbikrB30L/qLw4I/rBo21rsOlL aAk22wXbDcVPRtY47fLIdlOC0zOixCmwYW42IGhNx1dDgkZcZWhao5Y3ahLjbEDRwqJGvI COmbW7WQJs7dZ6SqR4J71JQoctMSZVQ= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=XopNAdgM; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf16.hostedemail.com: domain of ye.liu@linux.dev designates 91.218.175.180 as permitted sender) smtp.mailfrom=ye.liu@linux.dev X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1782868987; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9Uz52W8u4KLE/aWGQJH75bXXpHks/NCvUx2zWmpBg4g=; b=XopNAdgM1RymsQi1j5g/juFlb8A8mkH9/ZoZ7LNp1P54XcV3LX5YOgShubAupbGeGfj+De 74fskIOSFAxyda1qc/hhw0aS79zVqgOoV8fZm9NijKOywzt2W3qBwCYft5EBXyrXu7/fUr dwD7U0Gj1A238aOWHMlpcjZePfR7xyA= From: Ye Liu To: Andrew Morton , David Hildenbrand , Steven Rostedt , Masami Hiramatsu , Vlastimil Babka , Jan Kiszka , Kieran Bingham Cc: Ye Liu , Zi Yan , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Mathieu Desnoyers , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v4 2/7] mm/page_owner: add MR_NEVER to enum migrate_reason and use it for last_migrate_reason Date: Wed, 1 Jul 2026 09:22:28 +0800 Message-ID: <20260701012239.315262-3-ye.liu@linux.dev> In-Reply-To: <20260701012239.315262-1-ye.liu@linux.dev> References: <20260701012239.315262-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 88C0018000B X-Stat-Signature: 8tcncneg19n7iesdagewrioymp3ezdac X-HE-Tag: 1782868988-293317 X-HE-Meta: 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 B13Szlfc OQRDo+fEoeVw9Rb6CTYuWovrLk/UHRztj3lU8ta0mh7aY3hWYFkMOPjuNs7kSwZPfaAHpziBhSKHuqDZwj1QKuZ7Z8AeEVVJr10gHQVCrlT1WIZAQQpfrcGz17tpSKfTzEFxmcXhW7V+gzlQTx8jqXCMBM/DApK0psulrB8xBp18Zf936rr1A4E3mneZoyepQAwdWMobe5Rw/cfDZx+B0c/WmRwBzvowWMaom1jZKF6iKPuzjn3Foexbr8z68RHlK+f7Mq2O/hxnkuiMmpHtd9Nmqup6P+qLq4feutNk7V565KHZH9bgr1nPiaBYJtSxI9l7/6BrboOJ5hjUkt5Xb9V77PXm1fm8GBwxPk+ZXw7VSPluYyhozjYneC0sCiZyZ63diuqG7oz5Qwx4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The last_migrate_reason field uses -1 as a sentinel value to mean "no migration has happened". Replace the four bare -1 occurrences by adding a proper MR_NEVER member to enum migrate_reason, defining a corresponding "never_migrated" string in the MIGRATE_REASON trace macro, and updating the GDB page_owner script to use MR_NEVER instead of the hardcoded -1 so that lx-dump-page-owner does not incorrectly report unmigrated pages as migrated. No functional change. Signed-off-by: Ye Liu Reviewed-by: Zi Yan Reviewed-by: Vlastimil Babka (SUSE) --- include/linux/migrate_mode.h | 1 + include/trace/events/migrate.h | 3 ++- mm/page_owner.c | 8 ++++---- scripts/gdb/linux/page_owner.py | 4 +++- 4 files changed, 10 insertions(+), 6 deletions(-) diff --git a/include/linux/migrate_mode.h b/include/linux/migrate_mode.h index 265c4328b36a..05102d4d2490 100644 --- a/include/linux/migrate_mode.h +++ b/include/linux/migrate_mode.h @@ -25,6 +25,7 @@ enum migrate_reason { MR_LONGTERM_PIN, MR_DEMOTION, MR_DAMON, + MR_NEVER, /* page has never been migrated */ MR_TYPES }; diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h index cd01dd7b3640..11bc0aa14c7e 100644 --- a/include/trace/events/migrate.h +++ b/include/trace/events/migrate.h @@ -23,7 +23,8 @@ EM( MR_CONTIG_RANGE, "contig_range") \ EM( MR_LONGTERM_PIN, "longterm_pin") \ EM( MR_DEMOTION, "demotion") \ - EMe(MR_DAMON, "damon") + EM( MR_DAMON, "damon") \ + EMe(MR_NEVER, "never_migrated") /* * First define the enums in the above macros to be exported to userspace diff --git a/mm/page_owner.c b/mm/page_owner.c index 342549891a8d..c2f43ab860eb 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -339,7 +339,7 @@ noinline void __set_page_owner(struct page *page, unsigned short order, depot_stack_handle_t handle; handle = save_stack(gfp_mask); - __update_page_owner_handle(page, handle, order, gfp_mask, -1, + __update_page_owner_handle(page, handle, order, gfp_mask, MR_NEVER, ts_nsec, current->pid, current->tgid, current->comm); inc_stack_record_count(handle, gfp_mask, 1 << order); @@ -596,7 +596,7 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn, if (ret >= count) goto err; - if (page_owner->last_migrate_reason != -1) { + if (page_owner->last_migrate_reason != MR_NEVER) { ret += scnprintf(kbuf + ret, count - ret, "Page has been migrated, last migrate reason: %s\n", migrate_reason_names[page_owner->last_migrate_reason]); @@ -667,7 +667,7 @@ void __dump_page_owner(const struct page *page) stack_depot_print(handle); } - if (page_owner->last_migrate_reason != -1) + if (page_owner->last_migrate_reason != MR_NEVER) pr_alert("page has been migrated, last migrate reason: %s\n", migrate_reason_names[page_owner->last_migrate_reason]); page_ext_put(page_ext); @@ -826,7 +826,7 @@ static void init_pages_in_zone(struct zone *zone) /* Found early allocated page */ __update_page_owner_handle(page, early_handle, 0, 0, - -1, local_clock(), current->pid, + MR_NEVER, local_clock(), current->pid, current->tgid, current->comm); count++; ext_put_continue: diff --git a/scripts/gdb/linux/page_owner.py b/scripts/gdb/linux/page_owner.py index 8e713a09cfe7..eeabaeed438b 100644 --- a/scripts/gdb/linux/page_owner.py +++ b/scripts/gdb/linux/page_owner.py @@ -34,6 +34,7 @@ class DumpPageOwner(gdb.Command): max_pfn = None p_ops = None migrate_reason_names = None + mr_never = None def __init__(self): super(DumpPageOwner, self).__init__("lx-dump-page-owner", gdb.COMMAND_SUPPORT) @@ -65,6 +66,7 @@ class DumpPageOwner(gdb.Command): self.max_pfn = int(gdb.parse_and_eval("max_pfn")) self.page_ext_size = int(gdb.parse_and_eval("page_ext_size")) self.migrate_reason_names = gdb.parse_and_eval('migrate_reason_names') + self.mr_never = int(gdb.parse_and_eval('MR_NEVER')) def page_ext_invalid(self, page_ext): if page_ext == gdb.Value(0): @@ -138,7 +140,7 @@ class DumpPageOwner(gdb.Command): else: gdb.write('page last free stack trace:\n') stackdepot.stack_depot_print(page_owner["free_handle"]) - if page_owner['last_migrate_reason'] != -1: + if page_owner['last_migrate_reason'] != self.mr_never: gdb.write('page has been migrated, last migrate reason: %s\n' % self.migrate_reason_names[page_owner['last_migrate_reason']]) def read_page_owner(self): -- 2.43.0