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 72845C43458 for ; Tue, 14 Jul 2026 01:51:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 855EF6B0098; Mon, 13 Jul 2026 21:51:48 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7B8576B0099; Mon, 13 Jul 2026 21:51:48 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6CE766B009B; Mon, 13 Jul 2026 21:51:48 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 3EFB36B0098 for ; Mon, 13 Jul 2026 21:51:48 -0400 (EDT) Received: from smtpin22.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay01.hostedemail.com (Postfix) with ESMTP id BDBEB1C0122 for ; Tue, 14 Jul 2026 01:51:47 +0000 (UTC) X-FDA: 84985705854.22.DAFD566 Received: from out-173.mta0.migadu.com (out-173.mta0.migadu.com [91.218.175.173]) by imf25.hostedemail.com (Postfix) with ESMTP id 15602A0007 for ; Tue, 14 Jul 2026 01:51:45 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=evR+b9Hf; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf25.hostedemail.com: domain of ye.liu@linux.dev designates 91.218.175.173 as permitted sender) smtp.mailfrom=ye.liu@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1783993906; 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=ekG5RVZ1emoATZENxLcuG/PdW+Kh4SWs9GJzNxwGoFZaUq76jKzja11S0x6Boy7bkcCTtB ygNhy7mNY3SSkDCoLyNvL2SX0uKMP6vTnoGyzGYnfljvDzmg816oj9Z1sazf6F5YLeFcgc biC4Iw+PWks4yxcTJwA3waRUENyDaic= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=evR+b9Hf; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf25.hostedemail.com: domain of ye.liu@linux.dev designates 91.218.175.173 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=1783993906; b=lLwBmGL+N1r8UarG6eOdubPnYX8HQaPXJMVclZGxOemjAV5CEFEDqK0StjzPuKEUqT+Xce nV8ob215lVF7QGzGhwFrvreacFOjevIlwudvJYdfJKOr8DzgaZN9UpPE9I1oRRbIr2BcL+ zptZastcm4iaKJrWNjfeXAoLdqmeaE0= 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=1783993904; 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=evR+b9HfhPd9/q4bYfexK5ghaI2i9yq2n8g+yuiWZiuKIvA9uQNlLjKbH6uaSpfOTOsidQ reywB8MMasH+G9WTATxb9sIRILQArxH/RHNCAf0nQqYeazABPk/D9GsbUguMPjTSk5Q5TV dUO659U+gWnuDhwAsO1DbvHGThKaW3s= 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 v6 2/9] mm/page_owner: add MR_NEVER to enum migrate_reason and use it for last_migrate_reason Date: Tue, 14 Jul 2026 09:51:01 +0800 Message-ID: <20260714015117.78351-3-ye.liu@linux.dev> In-Reply-To: <20260714015117.78351-1-ye.liu@linux.dev> References: <20260714015117.78351-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 15602A0007 X-Stat-Signature: gr6j986cuj3k76ef44djhxcrz5fczwrg X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1783993905-959301 X-HE-Meta: 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 vDv6ymTJ H6XjX7/MCww0DP0DAvEHTfrYhD4YuFQLekrWagX///iYjc8mNgvu58N6gKtJLidzd78ydzoZlXPsEQ9sWcZUuh8YXFNlN7MKgxSYD3wFwi7xwPxsB9cqK6y42GgKgW92ICPioYk4bcaCsk4pN/GKRsgIY9FltkOqsmIbCw0CHcOterqbIWBwZITEbYy58t2OUvwp/oiqXBWOufk0qRoUR1DDCxlrdJBibq82HLkkYwgp3LDSh/DdfywRjQkkfgNEquf+qZ7mF0SwEjwjrnKq7IGl7nsUBMzzJTwqGkFCVC6A7Uaz9sa+aPOre8ACoxeVF91WFFadxCBJvtLk5mb6iWRZH5pgPZ4GZVAzDc/aR8+jTW9YuB7OR7i6rRXVV1KPFkKTzdIHG1DfPql0= 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