From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-189.mta0.migadu.com (out-189.mta0.migadu.com [91.218.175.189]) (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 DE7B31FF7C5 for ; Fri, 26 Jun 2026 02:46:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.189 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782441963; cv=none; b=idfXLvs7ESjSYuu9cxwX23pZQGMEwUHLXLf95vPtSaaijym1rNDmn8C0+8IWMALX+AcLnZP13aUD2Bl6VqHTPIEose8qh8wAq9Y96ZArppJgXQJW2oK3H8kt+mjxLI6f9rSrRc0+QR4EC4N6Vn60Kl5XqBKNNqNg7h6v4kh7x90= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782441963; c=relaxed/simple; bh=f/fA2OCvQ8YYctAnRz1gC1DLFH5vhByDTR2aiEw8Q/s=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ojdk49aphyIlZ53pkoxdin32c5Qe59qfHw8ZcJPaYYrHQ1BoD/nkKLq5nl2Cvx+tQvRydvKlh4xOdcyGzGyfN3sTYotImg4nEgini0eOUlomrJyG3RQ35h4Bv3In6V5c/Yw+sHOLviHvY3+xY0SYU2Vavy/9u5dP4YlCxWQAM+8= 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=xwJ+3ggx; arc=none smtp.client-ip=91.218.175.189 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="xwJ+3ggx" 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=1782441959; 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; bh=rcZP6aQpQG/oMe8abtKhEa8WDtm6cWM664IInmlteCo=; b=xwJ+3ggxbWniXcN6F7c5ZZUTIYk9J2BnOGMNdafwBU3XmRYxXVPtWMZQ5ddQ2vgkLBFuQI OO6fsoTucQtTdVT3fWzlSpt7/dXvgDsc1vRVTh/Ib3pKkQ3y76O/Yc9Yw2Vhox/E68HSRw Ldpulh+SsfpMdY+JnXbnNSnU1hUsUfE= From: Ye Liu To: Andrew Morton , Vlastimil Babka Cc: Ye Liu , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 0/6] mm/page_owner: misc cleanups Date: Fri, 26 Jun 2026 10:45:39 +0800 Message-ID: <20260626024550.25677-1-ye.liu@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT v2: - Add cover letter (no code changes). - Link:https://lore.kernel.org/all/20260623065234.31866-2-ye.liu@linux.dev/ This series collects a few cleanups for mm/page_owner.c that have been accumulated while reading through the file. There is no functional change -- the goal is to make the code easier to read and maintain. Patch 1 consolidates three identical PageBuddy skip blocks into a single skip_buddy_pages() helper, eliminating the duplication and keeping the lockless-read comment in one place. Patch 2 replaces the -1 magic number used for "never migrated" with a local MIGRATE_REASON_NONE define, making the intent explicit at every use site. Patch 3 hoists the CONFIG_MEMCG guard out of print_page_owner_memcg()'s body so that the real implementation and the empty stub are two clearly separate definitions, the common kernel idiom. Patch 4 adds a missing \n to the count_threshold debugfs attribute format string so that cat(1) output is properly terminated. Patch 5 moves free_ts_nsec from the allocation summary line to the free section in __dump_page_owner(), grouping it with free_pid and free_tgid where it logically belongs. This also makes the dump output consistent with print_page_owner(). Patch 6 drops the redundant page_owner_ prefix from file-scoped static symbols (stack_fops, threshold_fops, etc.). Since they cannot collide across translation units, the prefix carries no information. The series is based on v6.17-rc1 and has been compile-tested with and without CONFIG_MEMCG. Ye Liu (6): mm/page_owner: extract skip_buddy_pages() helper to unify buddy page skipping mm/page_owner: use MIGRATE_REASON_NONE instead of -1 for last_migrate_reason mm/page_owner: hoist CONFIG_MEMCG to function level for print_page_owner_memcg() mm/page_owner: add missing newline to count_threshold format string mm/page_owner: move free_ts_nsec output to free section in __dump_page_owner() mm/page_owner: drop redundant page_owner prefix from static symbols mm/page_owner.c | 121 +++++++++++++++++++++++++++--------------------- 1 file changed, 67 insertions(+), 54 deletions(-) -- 2.43.0