From patchwork Sun Jan 28 01:56:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Coly Li X-Patchwork-Id: 10187703 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 36CC860384 for ; Sun, 28 Jan 2018 06:32:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2099D28861 for ; Sun, 28 Jan 2018 06:32:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1567228874; Sun, 28 Jan 2018 06:32:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=2.0 tests=BAYES_00, DATE_IN_PAST_03_06, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7365A28861 for ; Sun, 28 Jan 2018 06:32:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751496AbeA1Gcu (ORCPT ); Sun, 28 Jan 2018 01:32:50 -0500 Received: from mx2.suse.de ([195.135.220.15]:49674 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751159AbeA1Gcu (ORCPT ); Sun, 28 Jan 2018 01:32:50 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 148CDAEFC; Sun, 28 Jan 2018 06:27:21 +0000 (UTC) From: Coly Li To: linux-bcache@vger.kernel.org Cc: linux-block@vger.kernel.org, Coly Li , Junhui Tang Subject: [PATCH v4 06/13] bcache: set error_limit correctly Date: Sun, 28 Jan 2018 09:56:18 +0800 Message-Id: <20180128015625.128497-7-colyli@suse.de> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20180128015625.128497-1-colyli@suse.de> References: <20180128015625.128497-1-colyli@suse.de> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Struct cache uses io_errors for two purposes, - Error decay: when cache set error_decay is set, io_errors is used to generate a small piece of delay when I/O error happens. - I/O errors counter: in order to generate big enough value for error decay, I/O errors counter value is stored by left shifting 20 bits (a.k.a IO_ERROR_SHIFT). In function bch_count_io_errors(), if I/O errors counter reaches cache set error limit, bch_cache_set_error() will be called to retire the whold cache set. But current code is problematic when checking the error limit, see the following code piece from bch_count_io_errors(), 90 if (error) { 91 char buf[BDEVNAME_SIZE]; 92 unsigned errors = atomic_add_return(1 << IO_ERROR_SHIFT, 93 &ca->io_errors); 94 errors >>= IO_ERROR_SHIFT; 95 96 if (errors < ca->set->error_limit) 97 pr_err("%s: IO error on %s, recovering", 98 bdevname(ca->bdev, buf), m); 99 else 100 bch_cache_set_error(ca->set, 101 "%s: too many IO errors %s", 102 bdevname(ca->bdev, buf), m); 103 } At line 94, errors is right shifting IO_ERROR_SHIFT bits, now it is real errors counter to compare at line 96. But ca->set->error_limit is initia- lized with an amplified value in bch_cache_set_alloc(), 1545 c->error_limit = 8 << IO_ERROR_SHIFT; It means by default, in bch_count_io_errors(), before 8<<20 errors happened bch_cache_set_error() won't be called to retire the problematic cache device. If the average request size is 64KB, it means bcache won't handle failed device until 512GB data is requested. This is too large to be an I/O threashold. So I believe the correct error limit should be much less. This patch sets default cache set error limit to 8, then in bch_count_io_errors() when errors counter reaches 8 (if it is default value), function bch_cache_set_error() will be called to retire the whole cache set. This patch also removes bits shifting when store or show io_error_limit value via sysfs interface. Nowadays most of SSDs handle internal flash failure automatically by LBA address re-indirect mapping. If an I/O error can be observed by upper layer code, it will be a notable error because that SSD can not re-indirect map the problematic LBA address to an available flash block. This situation indicates the whole SSD will be failed very soon. Therefore setting 8 as the default io error limit value makes sense, it is enough for most of cache devices. Changelog: v2: add reviewed-by from Hannes. v1: initial version for review. Signed-off-by: Coly Li Reviewed-by: Hannes Reinecke Reviewed-by: Tang Junhui Cc: Junhui Tang --- drivers/md/bcache/bcache.h | 1 + drivers/md/bcache/super.c | 2 +- drivers/md/bcache/sysfs.c | 4 ++-- 3 files changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h index 88d938c8d027..7d7512fa4f09 100644 --- a/drivers/md/bcache/bcache.h +++ b/drivers/md/bcache/bcache.h @@ -663,6 +663,7 @@ struct cache_set { ON_ERROR_UNREGISTER, ON_ERROR_PANIC, } on_error; +#define DEFAULT_IO_ERROR_LIMIT 8 unsigned error_limit; unsigned error_decay; diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 6d888e8fea8c..a373648b5d4b 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1583,7 +1583,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb) c->congested_read_threshold_us = 2000; c->congested_write_threshold_us = 20000; - c->error_limit = 8 << IO_ERROR_SHIFT; + c->error_limit = DEFAULT_IO_ERROR_LIMIT; return c; err: diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index b7166c504cdb..ba62e987b503 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -560,7 +560,7 @@ SHOW(__bch_cache_set) /* See count_io_errors for why 88 */ sysfs_print(io_error_halflife, c->error_decay * 88); - sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT); + sysfs_print(io_error_limit, c->error_limit); sysfs_hprint(congested, ((uint64_t) bch_get_congested(c)) << 9); @@ -660,7 +660,7 @@ STORE(__bch_cache_set) } if (attr == &sysfs_io_error_limit) - c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT; + c->error_limit = strtoul_or_return(buf); /* See count_io_errors() for why 88 */ if (attr == &sysfs_io_error_halflife)