From patchwork Wed Apr 26 08:20:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 13224229 X-Patchwork-Delegate: song@kernel.org 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 24722C7618E for ; Wed, 26 Apr 2023 08:22:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240143AbjDZIWb (ORCPT ); Wed, 26 Apr 2023 04:22:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44922 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240066AbjDZIW0 (ORCPT ); Wed, 26 Apr 2023 04:22:26 -0400 Received: from dggsgout12.his.huawei.com (unknown [45.249.212.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02D3F35AC; Wed, 26 Apr 2023 01:22:25 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.153]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4Q5sL45q37z4f4WHg; Wed, 26 Apr 2023 16:22:20 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP2 (Coremail) with SMTP id Syh0CgBnW+k430hkUexVIA--.50201S8; Wed, 26 Apr 2023 16:22:22 +0800 (CST) From: Yu Kuai To: song@kernel.org, akpm@osdl.org, neilb@suse.de Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawei.com Subject: [PATCH -next v2 4/7] md/raid1-10: submit write io directly if bitmap is not enabled Date: Wed, 26 Apr 2023 16:20:28 +0800 Message-Id: <20230426082031.1299149-5-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230426082031.1299149-1-yukuai1@huaweicloud.com> References: <20230426082031.1299149-1-yukuai1@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: Syh0CgBnW+k430hkUexVIA--.50201S8 X-Coremail-Antispam: 1UD129KBjvJXoWxuF15JFyrGw47Ww45Ww18AFb_yoW5AFy3pa yDGa4Ykr15JFW3X3ZxAa4DAFyFywn7tr9rKryfC395uFy3XFsxGFWrGay5twn7CrnxCFsx Xr1YkryUCr1UXrJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9C14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F 4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq 3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U M4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwCF04k20xvY0x0EwIxGrw CFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE 14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2 IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxK x2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI 0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUQSdkUUUUU= X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org From: Yu Kuai Commit 6cce3b23f6f8 ("[PATCH] md: write intent bitmap support for raid10") add bitmap support, and it changed that write io is submitted through daemon thread because bitmap need to be updated before write io. And later, plug is used to fix performance regression because all the write io will go to demon thread, which means io can't be issued concurrently. However, if bitmap is not enabled, the write io should not go to demon thread in the first place, and plug is not needed as well. Fixes: 6cce3b23f6f8 ("[PATCH] md: write intent bitmap support for raid10") Signed-off-by: Yu Kuai --- drivers/md/md-bitmap.c | 4 +--- drivers/md/md-bitmap.h | 7 +++++++ drivers/md/raid1-10.c | 13 +++++++++++-- 3 files changed, 19 insertions(+), 5 deletions(-) diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c index 2a21633c5917..17e988f88303 100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@ -1023,7 +1023,6 @@ static int md_bitmap_file_test_bit(struct bitmap *bitmap, sector_t block) return set; } - /* this gets called when the md device is ready to unplug its underlying * (slave) device queues -- before we let any writes go down, we need to * sync the dirty pages of the bitmap file to disk */ @@ -1033,8 +1032,7 @@ void md_bitmap_unplug(struct bitmap *bitmap) int dirty, need_write; int writing = 0; - if (!bitmap || !bitmap->storage.filemap || - test_bit(BITMAP_STALE, &bitmap->flags)) + if (!md_bitmap_enabled(bitmap)) return; /* look at each page to see if there are any set bits that need to be diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h index cfd7395de8fd..3a4750952b3a 100644 --- a/drivers/md/md-bitmap.h +++ b/drivers/md/md-bitmap.h @@ -273,6 +273,13 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot, sector_t *lo, sector_t *hi, bool clear_bits); void md_bitmap_free(struct bitmap *bitmap); void md_bitmap_wait_behind_writes(struct mddev *mddev); + +static inline bool md_bitmap_enabled(struct bitmap *bitmap) +{ + return bitmap && bitmap->storage.filemap && + !test_bit(BITMAP_STALE, &bitmap->flags); +} + #endif #endif diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c index 25d55036a6fb..4167bda139b1 100644 --- a/drivers/md/raid1-10.c +++ b/drivers/md/raid1-10.c @@ -130,9 +130,18 @@ static inline bool md_add_bio_to_plug(struct mddev *mddev, struct bio *bio, blk_plug_cb_fn unplug) { struct raid1_plug_cb *plug = NULL; - struct blk_plug_cb *cb = blk_check_plugged(unplug, mddev, - sizeof(*plug)); + struct blk_plug_cb *cb; + + /* + * If bitmap is not enabled, it's safe to submit the io directly, and + * this can get optimal performance. + */ + if (!md_bitmap_enabled(mddev->bitmap)) { + md_submit_write(bio); + return true; + } + cb = blk_check_plugged(unplug, mddev, sizeof(*plug)); if (!cb) return false;