From nobody Tue Dec 2 01:51:41 2025 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 4A9202D73A1 for ; Fri, 21 Nov 2025 03:27:20 +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=1763695641; cv=none; b=ohc8KldDoVPNdrVDoBMavxuJHe4wjONC/9sR+MzWPeybRiujBQFaJYm4Cx7cIKcArVohYVYJev2K7Vgb6s5OjeKTlkQxivp4+1IOZmg3BTUBCQEMwhFNRtlRMAwMvTCGVtrjqU0Beqok7xHjFoUE4W2Qs3pekVk4BT7c0Io+UTY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763695641; c=relaxed/simple; bh=lv8+yTEJIeZGkAiti08XUOQRFB8Mqfr2jh1MOoVvKtQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=GJj1JM5SOiAJNBUNHx7wTsdJ4iAveobAKLM02nI40SXyNcaxUMacwDEBBdZFSPuUx5kSVjRH6eXakPe8g9wwGHNXZ1lYcD1+3o9g/vIFiEgz3Ogl/rB1dlCSFIPheSQU0rCWdG1KtTE9TT2cX2TWfdxIcdUDqKNAAIhKY+4mALU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=svrAuLUE; 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="svrAuLUE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC70AC4CEF1; Fri, 21 Nov 2025 03:27:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763695640; bh=lv8+yTEJIeZGkAiti08XUOQRFB8Mqfr2jh1MOoVvKtQ=; h=From:To:Cc:Subject:Date:From; b=svrAuLUEgVbBggxnDz/4dZ4fA91I2w7g1FwRlR3z6VwgigV5ImJrWkqsy+uHieMtH IfAUWPiUQ2gTc/nkQrK5QriVIJn8DW1wNg34Rt6y1Fefqcq+ZGqxb7bcgvF+uhEnNy OIq022levOj8YRLIdAew8d10HMqpe94uKyFC6ibz4WI4TG/TUvbgt7ZIoPm5Ukjj+I bklXEijcjAGq8Y3TB1rVVrrQNlV6RNtm/129Ac9nHhsSPvZY+geqqW7KU4zOxqSi5P LLU9QIMwE/NmZXNUOnXSriu5q3w5JhfoOQE6U+gzvUv/mhJRIv2ST/M9HST8fitwrM /ZFw0FdFKpg0w== From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim , "Matthew Wilcox (Oracle)" , Christian Brauner Subject: [PATCH] [RFC] mm/fadvise: introduce POSIX_FADV_MLOCK Date: Fri, 21 Nov 2025 03:27:18 +0000 Message-ID: <20251121032718.1993528-1-jaegeuk@kernel.org> X-Mailer: git-send-email 2.52.0.487.g5c8c507ade-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This patch introduces a new POSIX_FADV_MLOCK which 1) invalidates the range= of cached pages, 2) sets the mapping as inaccessible, 3) POSIX_FADV_WILLNEED l= oads pages directly to the inaccessible mapping. The inaccessible pages will be invalidated by evict_inode or explicit munlo= ck(). Cc: Matthew Wilcox (Oracle) Cc: Christian Brauner Signed-off-by: Jaegeuk Kim --- include/uapi/linux/fadvise.h | 2 ++ mm/fadvise.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/uapi/linux/fadvise.h b/include/uapi/linux/fadvise.h index 0862b87434c2..06018688b99b 100644 --- a/include/uapi/linux/fadvise.h +++ b/include/uapi/linux/fadvise.h @@ -19,4 +19,6 @@ #define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */ #endif =20 +#define POSIX_FADV_MLOCK 8 /* Load pages into inaccessible map. */ + #endif /* FADVISE_H_INCLUDED */ diff --git a/mm/fadvise.c b/mm/fadvise.c index 588fe76c5a14..849b151d2024 100644 --- a/mm/fadvise.c +++ b/mm/fadvise.c @@ -56,6 +56,7 @@ int generic_fadvise(struct file *file, loff_t offset, lof= f_t len, int advice) case POSIX_FADV_WILLNEED: case POSIX_FADV_NOREUSE: case POSIX_FADV_DONTNEED: + case POSIX_FADV_MLOCK: /* no bad return value, but ignore advice */ break; default: @@ -93,6 +94,19 @@ int generic_fadvise(struct file *file, loff_t offset, lo= ff_t len, int advice) file->f_mode &=3D ~FMODE_RANDOM; spin_unlock(&file->f_lock); break; + case POSIX_FADV_MLOCK: + /* Remove the cached pages. */ + if (!mapping_unevictable(mapping)) { + invalidate_inode_pages2_range(mapping, + offset >> PAGE_SHIFT, + (offset + len - 1) >> PAGE_SHIFT); + + /* set the mapping is unevictable */ + filemap_invalidate_lock(mapping); + mapping_set_inaccessible(mapping); + filemap_invalidate_unlock(mapping); + } + fallthrough; case POSIX_FADV_WILLNEED: /* First and last PARTIAL page! */ start_index =3D offset >> PAGE_SHIFT; --=20 2.52.0.487.g5c8c507ade-goog