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 0B2BF2417D1; Thu, 30 Apr 2026 14:20:23 +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=1777558824; cv=none; b=CM/CFraJ01ZA3dhjIKRYNuu5+ywuUEGwQ1uK1JwuUNILGb23lVVQv4YVk3CbEvxWYtmgh4qq2QVR4iPdXOZnQ54fe3yn73RZynDZPOHyIth8f01ObPDti3ovp6t/dHpdEjQQtRcTMhVNJ6MexIcCviAgamT+gb0DUb9VjR9UzyM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777558824; c=relaxed/simple; bh=E5B83sxytNbrJA03BcZbM7JWpgeC4uEKhNZhIPTXLRo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=A72s2RqKd/dr0fXuLXoejQ7RUxdjN8Nkx2bft9qSy9XZagY6bHs98RVkgD1JbfCigheLN7bgIgsKDL3WlNHnFjCDXNYElPR1pMWfmtO8zWfFCVthyB1QoqninK3Jw64J6n4BCVuc0a3Ls06JQjG3TM9EaFMwC1iscavQn30LCtc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LRbEIf6a; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LRbEIf6a" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C3BA0C2BCB3; Thu, 30 Apr 2026 14:20:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777558823; bh=E5B83sxytNbrJA03BcZbM7JWpgeC4uEKhNZhIPTXLRo=; h=From:To:Cc:Subject:Date:From; b=LRbEIf6awF9GrzQHSCeFiaYvy903gtqCV+HgwbkqOFZFGvxD5x08gJMRWOXLpDYRn +Yz4K8zuyUyChAVgciqoQcZMzmelqRfTaY1f5ihkMCZ25HWjbbnRQ9gzUBiWUJ/pfY r5ssQwLNjYyDDGtGXPLJyNetUgtKKtBmP5MXb9WFCU6ciJgHJFnlBlz4LkZDPhfiHL y5hyqeXIGEVl/UKhsca8NuW5PRaJrtPg7AKtlXcxM+7/mrWImKt7+/jjaiRsR0ZW9M K1w8vIoiNdjvvYqJWF/lnEgbwCQ5Gp4cEP2QdwZR1NCdGlu/LeK+ljBfP0f0DspW1N jSBEZeNZE4m7w== From: SeongJae Park To: Cc: SeongJae Park , "Liam R. Howlett" , Andrew Morton , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v2.1 0/2] mm/damon/stat: add kdamond_pid parameter Date: Thu, 30 Apr 2026 07:20:08 -0700 Message-ID: <20260430142013.80993-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit DAMON_STAT doesn't provide the pid of its kdamond, unlike DAMON_RECLAIM and DAMON_LRU_SORT. This makes user-space management of DAMON_STAT unnecessarily complicated. Provide the information via a new parameter, namely kdamond_pid, and document it. Changes from RFC v2 - v2: https://lore.kernel.org/20260425203309.108879-1-sj@kernel.org - Rebase to latest mm-new. Changes from RFC v1.2 - rfc v1.2: https://lore.kernel.org/20260416002149.87090-1-sj@kernel.org - Detect and use fresh kdamond pid. Changes from RFC v1.1 - rfc v1.1: https://lore.kernel.org/20260414235912.98174-1-sj@kernel.org - Close the parentheses of error handling block. Changes from RFC - rfc: https://lore.kernel.org/20260414053742.90296-1-sj@kernel.org - Fix damon_kdamond_pid() failure handling. SeongJae Park (2): mm/damon/stat: add a parameter for reading kdamond pid Docs/admin-guide/mm/damon/stat: document kdamond_pid parameter Documentation/admin-guide/mm/damon/stat.rst | 7 ++++ mm/damon/stat.c | 38 +++++++++++++++++++++ 2 files changed, 45 insertions(+) base-commit: b8e00b62c650b2aa471195f663301118fde889c2 -- 2.47.3