From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-188.mta1.migadu.com (out-188.mta1.migadu.com [95.215.58.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BA13E2C15BE for ; Tue, 30 Jun 2026 01:53:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782784435; cv=none; b=GN3b2HprNjQHoPFVjZWwdFUoknRCNZ822ZC9GDzEXlc+MOY9HSxV5hPtmmp/OZhm/00b+NwIW2ZKuwdLVm7VWjqmtcLtQ+sxDlruy5xBR7XwB9ivtM4AK0usAEAlkdUuD/Yt5EoX74m0l7NZ4wFzXaQ4bFdil7L5uhrhpzEbC74= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782784435; c=relaxed/simple; bh=vnf7JPkMu9uAlmUFnocqbmWTOfwkd6mWLZGraSk0JA0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mvW1imDUiZfKks3iAU2m/BmP8kI/AlNsAmvP5bVHWhdIaDreSNGw0sY6/V/xKXi8ZXYSxpPSDVRoggaeePZ7fXN747UqOquZ4NplgtzyO89UBpPvz+EzgIi6BLlT4rxV9cYVNXhhaZ2vWpomZlmVpRpD/+7xj+SP/PD03MglW5A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=TMgXlUlz; arc=none smtp.client-ip=95.215.58.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="TMgXlUlz" 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=1782784430; 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=o+9YrpEU34OPDz2iHabTDbvzWefArLaf4fpVcXgkiMk=; b=TMgXlUlzodF1IoLeynZ74eaIyV4U7rjvQXiu7RJXnASDsdrob6kxCYb1iZ3Oj2sGEoImCo PpbCJQ3Y7D4H1RmilH3Ccx34B3/dsJZlglzP80/GxM6U5g9lqjT0ZKC4rAuGD3D7z53R4e iFzxQ+Akjbb+4xLM01Ojlc64dPgqoAM= From: Ye Liu To: Andrew Morton , David Hildenbrand , Steven Rostedt , Masami Hiramatsu , Vlastimil Babka 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 v3 2/7] mm/page_owner: add MR_NEVER to enum migrate_reason and use it for last_migrate_reason Date: Tue, 30 Jun 2026 09:53:19 +0800 Message-ID: <20260630015331.147174-3-ye.liu@linux.dev> In-Reply-To: <20260630015331.147174-1-ye.liu@linux.dev> References: <20260630015331.147174-1-ye.liu@linux.dev> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT 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 removing the local MIGRATE_REASON_NONE define. No functional change. Signed-off-by: Ye Liu --- include/linux/migrate_mode.h | 1 + include/trace/events/migrate.h | 3 ++- mm/page_owner.c | 8 ++++---- 3 files changed, 7 insertions(+), 5 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: -- 2.43.0