From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 7AA8D3F23DD for ; Wed, 29 Apr 2026 12:11:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777464692; cv=none; b=S2ooFkVgSh7uboDdZN8ry+m+L65f7XRMCrTIIEaPeIVrdceOeDR/2DlJqHKNoBgnFRG72WG8JCCv71uD9cB+YLD3dxOKHAr38ZYWSzdxHFhfb3C+F+WV/qCm941q/4lu5ICQ+q5F2qkC7UCt+vlZnNhAwjrptFE1ADzv3MX+uZw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777464692; c=relaxed/simple; bh=cF11hKiajMY5ACkaDfwbaAhhQi8nnkeplh/4duSB9CU=; h=Date:To:From:Subject:Message-Id; b=JqoTK8bapkS3M9V2HyoAYbhnJfLwjxsKUnKrLCwGV8uNx4RXirJp7se54bpXSom36MyZ+xhBWYhU0byZeKdotc+3BMCRKLSM/s73O6H736w6iCvIZgd8ZLJdcjwtcZjrYXBVh23oqbnvKPnf2BjghWhFjx52to3daZgi/F7cTKA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=dRwHmkRw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="dRwHmkRw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 24CBAC19425; Wed, 29 Apr 2026 12:11:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1777464692; bh=cF11hKiajMY5ACkaDfwbaAhhQi8nnkeplh/4duSB9CU=; h=Date:To:From:Subject:From; b=dRwHmkRweNvr+KsXH9Szi5++7NpLjnaCwPsUtgNURPFBJgmMKX73f4D3ci5vNZC+d otUQTFzoJOr+T0Gtm+u7niI/IbWJEOl1ZpZ8E4XvSsaGDAyEbpCp5HYWQgF5607Zwm Ed5QLtR2oAh8Aaaw4OrwWwKmMWkqEawPRo3AE1Ng= Date: Wed, 29 Apr 2026 05:11:31 -0700 To: mm-commits@vger.kernel.org,zhen.ni@easystack.cn,akpm@linux-foundation.org From: Andrew Morton Subject: [to-be-updated] mm-page_owner-add-print_mode-filter.patch removed from -mm tree Message-Id: <20260429121132.24CBAC19425@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/page_owner: add print_mode filter has been removed from the -mm tree. Its filename was mm-page_owner-add-print_mode-filter.patch This patch was dropped because an updated version will be issued ------------------------------------------------------ From: Zhen Ni Subject: mm/page_owner: add print_mode filter Date: Tue, 28 Apr 2026 15:11:10 +0800 Add print_mode functionality to reduce page_owner output size by printing only the stack handle instead of the full stack trace. Example output with print_mode enabled: Page allocated via order 0, mask 0x42800(GFP_NOWAIT|__GFP_COMP), pid 1, tgid 1 (systemd), ts 349667370 ns PFN 0xa00a2 type Unmovable Block 1280 type Unmovable Flags 0x33fffe0000004124(referenced|lru|active|private|node=3|zone=0| lastcpupid=0x1ffff) handle: 17432583 Charged to memcg / Print mode significantly reduces output size while preserving all other page allocation information. The correspondence between handles and stack traces can be obtained through the show_stacks_handles interface. Link: https://lore.kernel.org/linux-mm/20260417154638.22370-3-zhen.ni@easystack.cn/ Link: https://lore.kernel.org/20260428071112.1420380-3-zhen.ni@easystack.cn Signed-off-by: Zhen Ni Suggested-by: Zi Yan Cc: Brendan Jackman Cc: Johannes Weiner Cc: Michal Hocko Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/page_owner.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) --- a/mm/page_owner.c~mm-page_owner-add-print_mode-filter +++ a/mm/page_owner.c @@ -590,7 +590,13 @@ print_page_owner(char __user *buf, size_ migratetype_names[pageblock_mt], &page->flags); - ret += stack_depot_snprint(handle, kbuf + ret, count - ret, 0); + /* Print mode: full stack or stack handle */ + if (READ_ONCE(owner_filter.print_mode) == PAGE_OWNER_PRINT_STACK_HANDLE) { + ret += scnprintf(kbuf + ret, count - ret, + "handle: %d\n", handle); + } else { + ret += stack_depot_snprint(handle, kbuf + ret, count - ret, 0); + } if (ret >= count) goto err; @@ -985,6 +991,24 @@ static int page_owner_threshold_set(void DEFINE_SIMPLE_ATTRIBUTE(page_owner_threshold_fops, &page_owner_threshold_get, &page_owner_threshold_set, "%llu"); +static int page_owner_print_mode_get(void *data, u64 *val) +{ + *val = READ_ONCE(owner_filter.print_mode); + return 0; +} + +static int page_owner_print_mode_set(void *data, u64 val) +{ + if (val > PAGE_OWNER_PRINT_STACK_HANDLE) + return -EINVAL; + WRITE_ONCE(owner_filter.print_mode, val); + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(page_owner_print_mode_fops, + &page_owner_print_mode_get, + &page_owner_print_mode_set, "%lld"); + static int __init pageowner_init(void) { @@ -998,6 +1022,8 @@ static int __init pageowner_init(void) debugfs_create_file("page_owner", 0400, NULL, NULL, &page_owner_fops); filter_dir = debugfs_create_dir("page_owner_filter", NULL); + debugfs_create_file("print_mode", 0600, filter_dir, NULL, + &page_owner_print_mode_fops); dir = debugfs_create_dir("page_owner_stacks", NULL); debugfs_create_file("show_stacks", 0400, dir, _ Patches currently in -mm which might be from zhen.ni@easystack.cn are mm-page_owner-add-numa-node-filter-with-nodelist-support.patch mm-page_owner-fix-%pgp-format-specifier-argument-type.patch