From nobody Mon Sep 29 21:09:37 2025 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 AB1DEC25B0E for ; Tue, 16 Aug 2022 00:58:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346834AbiHPA5B (ORCPT ); Mon, 15 Aug 2022 20:57:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45256 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345775AbiHPAvD (ORCPT ); Mon, 15 Aug 2022 20:51:03 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED934B69F8; Mon, 15 Aug 2022 13:46:43 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id A88A3B81197; Mon, 15 Aug 2022 20:46:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D94D9C433C1; Mon, 15 Aug 2022 20:46:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660596401; bh=xVQQgNRQH83af2R6Yq9bjg1K5EtMy1gWKh5F6Uvmb9c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Zffe1L15BIa2qg6M8fyKhfgb+G+xe7mpeeoP7gbgTgMmvEXhm0mr2KPemUeZVslR9 n+9FdaljlWHidOuEdOEzOX5u6ibAwgX7iVEw1zlEtDlGRkNSTovW4YPzZ7CMxJHCjy DQWmRyhZ19T+sOHlIxznetTN8dzxXEHL74MVvh08= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mikulas Patocka , Mike Snitzer , Sasha Levin Subject: [PATCH 5.19 1068/1157] dm writecache: set a default MAX_WRITEBACK_JOBS Date: Mon, 15 Aug 2022 20:07:04 +0200 Message-Id: <20220815180522.830441037@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180439.416659447@linuxfoundation.org> References: <20220815180439.416659447@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Mikulas Patocka [ Upstream commit ca7dc242e358e46d963b32f9d9dd829785a9e957 ] dm-writecache has the capability to limit the number of writeback jobs in progress. However, this feature was off by default. As such there were some out-of-memory crashes observed when lowering the low watermark while the cache is full. This commit enables writeback limit by default. It is set to 256MiB or 1/16 of total system memory, whichever is smaller. Cc: stable@vger.kernel.org Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer Signed-off-by: Sasha Levin --- drivers/md/dm-writecache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c index d74c5a7a0ab4..d572135cd43f 100644 --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -22,7 +22,7 @@ =20 #define HIGH_WATERMARK 50 #define LOW_WATERMARK 45 -#define MAX_WRITEBACK_JOBS 0 +#define MAX_WRITEBACK_JOBS min(0x10000000 / PAGE_SIZE, totalram_pages() /= 16) #define ENDIO_LATENCY 16 #define WRITEBACK_LATENCY 64 #define AUTOCOMMIT_BLOCKS_SSD 65536 --=20 2.35.1