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[2620:137:e000::1:20]) by mx.google.com with ESMTP id nd16-20020a170907629000b0094a79cd4a98si5056884ejc.595.2023.04.11.02.01.21; Tue, 11 Apr 2023 02:01:45 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=huawei.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230026AbjDKIqi (ORCPT + 99 others); Tue, 11 Apr 2023 04:46:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230310AbjDKIqf (ORCPT ); Tue, 11 Apr 2023 04:46:35 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF36A1723 for ; Tue, 11 Apr 2023 01:46:33 -0700 (PDT) Received: from dggpemm100009.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4PwfYL17MqznVXb; Tue, 11 Apr 2023 16:45:10 +0800 (CST) 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 15.1.2507.23; Tue, 11 Apr 2023 16:46:31 +0800 From: Liu Shixin To: Seth Jennings , Dan Streetman , Vitaly Wool , Andrew Morton , Nathan Chancellor , Christoph Hellwig CC: , , Liu Shixin Subject: [PATCH -next v9 3/3] mm/zswap: delay the initialization of zswap Date: Tue, 11 Apr 2023 17:36:32 +0800 Message-ID: <20230411093632.822290-4-liushixin2@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230411093632.822290-1-liushixin2@huawei.com> References: <20230411093632.822290-1-liushixin2@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.113.32] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpemm100009.china.huawei.com (7.185.36.113) X-CFilter-Loop: Reflected X-Spam-Status: No, score=-2.3 required=5.0 tests=RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1762869857081387508?= X-GMAIL-MSGID: =?utf-8?q?1762869857081387508?= Since some users may not use zswap, the zswap_pool is wasted. Save memory by delaying the initialization of zswap until enabled. Signed-off-by: Liu Shixin Reviewed-by: Christoph Hellwig --- mm/zswap.c | 71 +++++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 54 insertions(+), 17 deletions(-) diff --git a/mm/zswap.c b/mm/zswap.c index 9169c2baee87..af97e8f9d678 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -81,6 +81,8 @@ static bool zswap_pool_reached_full; #define ZSWAP_PARAM_UNSET "" +static int zswap_setup(void); + /* Enable/disable zswap */ static bool zswap_enabled = IS_ENABLED(CONFIG_ZSWAP_DEFAULT_ON); static int zswap_enabled_param_set(const char *, @@ -222,6 +224,9 @@ enum zswap_init_type { static enum zswap_init_type zswap_init_state; +/* used to ensure the integrity of initialization */ +static DEFINE_MUTEX(zswap_init_lock); + /* init completed, but couldn't create the initial pool */ static bool zswap_has_pool; @@ -654,7 +659,7 @@ static struct zswap_pool *zswap_pool_create(char *type, char *compressor) return NULL; } -static __init struct zswap_pool *__zswap_pool_create_fallback(void) +static struct zswap_pool *__zswap_pool_create_fallback(void) { bool has_comp, has_zpool; @@ -755,29 +760,43 @@ static void zswap_pool_put(struct zswap_pool *pool) * param callbacks **********************************/ +static bool zswap_pool_changed(const char *s, const struct kernel_param *kp) +{ + /* no change required */ + if (!strcmp(s, *(char **)kp->arg) && zswap_has_pool) + return false; + return true; +} + /* val must be a null-terminated string */ static int __zswap_param_set(const char *val, const struct kernel_param *kp, char *type, char *compressor) { struct zswap_pool *pool, *put_pool = NULL; char *s = strstrip((char *)val); - int ret; + int ret = 0; + bool new_pool = false; + mutex_lock(&zswap_init_lock); switch (zswap_init_state) { case ZSWAP_UNINIT: /* if this is load-time (pre-init) param setting, * don't create a pool; that's done during init. */ - return param_set_charp(s, kp); + ret = param_set_charp(s, kp); + break; case ZSWAP_INIT_SUCCEED: - /* no change required */ - if (!strcmp(s, *(char **)kp->arg) && zswap_has_pool) - return 0; + new_pool = zswap_pool_changed(s, kp); break; case ZSWAP_INIT_FAILED: pr_err("can't set param, initialization failed\n"); - return -ENODEV; + ret = -ENODEV; } + mutex_unlock(&zswap_init_lock); + + /* no need to create a new pool, return directly */ + if (!new_pool) + return ret; if (!type) { if (!zpool_has_pool(s)) { @@ -867,19 +886,30 @@ static int zswap_zpool_param_set(const char *val, static int zswap_enabled_param_set(const char *val, const struct kernel_param *kp) { + int ret = -ENODEV; + + /* if this is load-time (pre-init) param setting, only set param. */ + if (system_state != SYSTEM_RUNNING) + return param_set_bool(val, kp); + + mutex_lock(&zswap_init_lock); switch (zswap_init_state) { case ZSWAP_UNINIT: - return param_set_bool(val, kp); + if (zswap_setup()) + break; + fallthrough; case ZSWAP_INIT_SUCCEED: - if (!zswap_has_pool) { + if (!zswap_has_pool) pr_err("can't enable, no pool configured\n"); - return -ENODEV; - } else - return param_set_bool(val, kp); + else + ret = param_set_bool(val, kp); + break; case ZSWAP_INIT_FAILED: pr_err("can't enable, initialization failed\n"); - return -ENODEV; } + mutex_unlock(&zswap_init_lock); + + return ret; } /********************************* @@ -1437,7 +1467,7 @@ static const struct frontswap_ops zswap_frontswap_ops = { static struct dentry *zswap_debugfs_root; -static int __init zswap_debugfs_init(void) +static int zswap_debugfs_init(void) { if (!debugfs_initialized()) return -ENODEV; @@ -1468,7 +1498,7 @@ static int __init zswap_debugfs_init(void) return 0; } #else -static int __init zswap_debugfs_init(void) +static int zswap_debugfs_init(void) { return 0; } @@ -1477,7 +1507,7 @@ static int __init zswap_debugfs_init(void) /********************************* * module init and exit **********************************/ -static int __init init_zswap(void) +static int zswap_setup(void) { struct zswap_pool *pool; int ret; @@ -1540,8 +1570,15 @@ static int __init init_zswap(void) zswap_enabled = false; return -ENOMEM; } + +static int __init zswap_init(void) +{ + if (!zswap_enabled) + return 0; + return zswap_setup(); +} /* must be late so crypto has time to come up */ -late_initcall(init_zswap); +late_initcall(zswap_init); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Seth Jennings ");