From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3BA90ECAAD3 for ; Thu, 15 Sep 2022 03:16:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230204AbiIODQT (ORCPT ); Wed, 14 Sep 2022 23:16:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229588AbiIODQL (ORCPT ); Wed, 14 Sep 2022 23:16:11 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 52DA28E99B for ; Wed, 14 Sep 2022 20:16:09 -0700 (PDT) Received: from dggpemm500022.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4MSj0L60j5zNmK3; Thu, 15 Sep 2022 11:11:30 +0800 (CST) Received: from dggpemm100009.china.huawei.com (7.185.36.113) by dggpemm500022.china.huawei.com (7.185.36.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 15 Sep 2022 11:16:06 +0800 Received: from huawei.com (10.175.113.32) by dggpemm100009.china.huawei.com (7.185.36.113) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 15 Sep 2022 11:16:05 +0800 From: Liu Shixin To: Seth Jennings , Dan Streetman , Vitaly Wool , Andrew Morton , Nathan Chancellor , "Christoph Hellwig" CC: , , Liu Shixin , Kefeng Wang Subject: [PATCH v5 0/5] Delay the initializaton of zswap Date: Thu, 15 Sep 2022 11:49:58 +0800 Message-ID: <20220915035003.3347466-1-liushixin2@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.113.32] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm100009.china.huawei.com (7.185.36.113) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In the initialization of zswap, about 18MB memory will be allocated for zswap_pool. Since not all users use zswap, the memory may be wasted. Save the memory for these users by delaying the initialization of zswap to first enablement. v4->v5: Rebase on next-20220913, the previous first patch is superseded by patch ("frontswap: don't call ->init if no ops are registered"). v3->v4: Revert three patches to replace previous patch[1-2] suggested by Vitaly. v2->v3: Fix frontswap_ops NULL reported by Nathan and add init for online swap device in backend register. v1->v2: Change init_zswap to zswap_init suggested by Andrew. Liu Shixin (5): Revert "mm: mark swap_lock and swap_active_head static" Revert "frontswap: simplify frontswap_register_ops" mm/zswap: replace zswap_init_{started/failed} with zswap_init_state mm/zswap: delay the initializaton of zswap until the first enablement mm/zswap: skip confusing print info include/linux/swapfile.h | 2 ++ mm/frontswap.c | 42 ++++++++++++++++++++++ mm/swapfile.c | 4 +-- mm/zswap.c | 77 ++++++++++++++++++++++++++++++---------- 4 files changed, 104 insertions(+), 21 deletions(-) -- 2.25.1