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 3E3F633993 for ; Thu, 9 Oct 2025 02:33:13 +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=1759977193; cv=none; b=ienK4fFEiZm/7e0RNzxHPnuvhNqFXb66CcVJA6CuFO3XiE3Lz1IWQvM4BmmoE7dRraU7rBeUMEVluu2cdAZGGdhA++lvqCcKs+KWFexUSZiG1F5YzHuR2C0JIlI3vmzk/azb0M4FrBsN+95sYw5S2hytO9iILUg4/1xknTto5JI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759977193; c=relaxed/simple; bh=YSeKut1TQDpXVPtxDA50FVffw/4htzBianAHzj/msMU=; h=Date:To:From:Subject:Message-Id; b=rCxbQoFGPA2Gz+7JRdG0bgwOpMySGtqRc1/UuXOGur+ao8BBr0I65QFM1Kn57ndNkZwizx4RTMxISgcOd6NtCxULlBETw3S2MuiilMVxLWvUb/E2RZCbweS4/uq9wcKbooLTlADyMQvrI3CbH7pijDjMxgoK1FvnZDklOdVLI8A= 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=e7PybNbD; 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="e7PybNbD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03523C4CEF5; Thu, 9 Oct 2025 02:33:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1759977193; bh=YSeKut1TQDpXVPtxDA50FVffw/4htzBianAHzj/msMU=; h=Date:To:From:Subject:From; b=e7PybNbDwBN2eGP1uCBiO/Cyt1iYKhb1z5d3kNB2Wxw8gtLYH0S4LZz6iisKvxYJH kbiA/KNvp30EUAMtU8BP9A+aoWzKY9pcYIRFffqu3n2lBdsNz/sXI3CVlxztTMc3A0 SQ/B7XwuuiKA6Y0pn1Y2qBWECG2ezR70TEt7+kHQ= Date: Wed, 08 Oct 2025 19:33:10 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,vbabka@suse.cz,surenb@google.com,osalvador@suse.de,mhocko@suse.com,jackmanb@google.com,hannes@cmpxchg.org,mfo@igalia.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-page_owner-add-debugfs-file-show_stacks_handles.patch added to mm-new branch Message-Id: <20251009023313.03523C4CEF5@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/page_owner: add debugfs file 'show_stacks_handles' has been added to the -mm mm-new branch. Its filename is mm-page_owner-add-debugfs-file-show_stacks_handles.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_owner-add-debugfs-file-show_stacks_handles.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Mauricio Faria de Oliveira Subject: mm/page_owner: add debugfs file 'show_stacks_handles' Date: Wed, 1 Oct 2025 14:56:10 -0300 Add the file 'show_stacks_handles' to show just stack traces and their handles, in order to resolve stack traces and handles (i.e., to identify the stack traces for handles in previous reads from 'show_handles'). All stacks/handles must show up, regardless of their number of pages, that might have become zero or no longer make 'count_threshold', but made it in previous reads from 'show_handles' -- and need to be resolved later. P.S.: now, print the extra newline independently of the number of pages. Link: https://lkml.kernel.org/r/20251001175611.575861-5-mfo@igalia.com Signed-off-by: Mauricio Faria de Oliveira Cc: Brendan Jackman Cc: Johannes Weiner Cc: Michal Hocko Cc: Oscar Salvador Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton --- mm/page_owner.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) --- a/mm/page_owner.c~mm-page_owner-add-debugfs-file-show_stacks_handles +++ a/mm/page_owner.c @@ -913,7 +913,8 @@ static int stack_print(struct seq_file * nr_base_pages = refcount_read(&stack_record->count) - 1; - if (nr_base_pages < 1 || nr_base_pages < page_owner_pages_threshold) + if (ctx->flags & STACK_PRINT_FLAG_PAGES && + (nr_base_pages < 1 || nr_base_pages < page_owner_pages_threshold)) return 0; if (ctx->flags & STACK_PRINT_FLAG_STACK) { @@ -925,7 +926,8 @@ static int stack_print(struct seq_file * if (ctx->flags & STACK_PRINT_FLAG_HANDLE) seq_printf(m, "handle: %d\n", stack_record->handle.handle); if (ctx->flags & STACK_PRINT_FLAG_PAGES) - seq_printf(m, "nr_base_pages: %d\n\n", nr_base_pages); + seq_printf(m, "nr_base_pages: %d\n", nr_base_pages); + seq_putc(m, '\n'); return 0; } @@ -999,6 +1001,10 @@ static int __init pageowner_init(void) (void *)(STACK_PRINT_FLAG_HANDLE | STACK_PRINT_FLAG_PAGES), &page_owner_stack_operations); + debugfs_create_file("show_stacks_handles", 0400, dir, + (void *)(STACK_PRINT_FLAG_STACK | + STACK_PRINT_FLAG_HANDLE), + &page_owner_stack_operations); debugfs_create_file("count_threshold", 0600, dir, NULL, &proc_page_owner_threshold); _ Patches currently in -mm which might be from mfo@igalia.com are mm-page_owner-introduce-struct-stack_print_ctx.patch mm-page_owner-add-struct-stack_print_ctxflags.patch mm-page_owner-add-debugfs-file-show_handles.patch mm-page_owner-add-debugfs-file-show_stacks_handles.patch mm-page_owner-update-documentation-with-show_handles-and-show_stacks_handles.patch