From patchwork Wed May 18 07:48:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Kumar X-Patchwork-Id: 574108 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 7ED93C433FE for ; Wed, 18 May 2022 07:49:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232514AbiERHtX (ORCPT ); Wed, 18 May 2022 03:49:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52394 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232503AbiERHtS (ORCPT ); Wed, 18 May 2022 03:49:18 -0400 Received: from alexa-out-sd-01.qualcomm.com (alexa-out-sd-01.qualcomm.com [199.106.114.38]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D780C11E4B6; Wed, 18 May 2022 00:49:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1652860158; x=1684396158; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=rOYdWmdQCnEpAHcJFCYdRtOeaAOYF7eoFxilIXHP6Bo=; b=f76IxhdMGRpcFIVZl4IoTOvtiIGxMgmbcF5O68qO3WRp3t0i5EFlC3nQ GP2f97x2etzlO2ZE3TygF0xsWdZsNTQTcZEDjgvE+cYvxJvuRuRLVpGse YjdmChiVaYpg0oHfvMguDJ/JPDTve9Qy17U7qma1wL+izhjsTabITBwxt Y=; Received: from unknown (HELO ironmsg05-sd.qualcomm.com) ([10.53.140.145]) by alexa-out-sd-01.qualcomm.com with ESMTP; 18 May 2022 00:49:17 -0700 X-QCInternal: smtphost Received: from unknown (HELO nasanex01a.na.qualcomm.com) ([10.52.223.231]) by ironmsg05-sd.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2022 00:49:17 -0700 Received: from blr-ubuntu-185.qualcomm.com (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Wed, 18 May 2022 00:49:09 -0700 From: Vivek Kumar To: , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , Vivek Kumar , Prasanna Kumar Subject: [RFC 2/6] PM: Hibernate: Add option to disable disk offset randomization Date: Wed, 18 May 2022 13:18:37 +0530 Message-ID: <1652860121-24092-3-git-send-email-quic_vivekuma@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1652860121-24092-1-git-send-email-quic_vivekuma@quicinc.com> References: <1652860121-24092-1-git-send-email-quic_vivekuma@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01a.na.qualcomm.com (10.52.223.231) Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Add a kernel parameter to disable the disk offset randomization for SSD devices in which such feature is available at the firmware level. This is helpful in improving hibernation resume time. Signed-off-by: Vivek Kumar Signed-off-by: Prasanna Kumar --- Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++ kernel/power/swap.c | 9 +++++++++ 2 files changed, 20 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 666ade9..06b4f10 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5192,6 +5192,17 @@ Useful for devices that are detected asynchronously (e.g. USB and MMC devices). + noswap_randomize + Kernel uses random disk offsets to help with wear-levelling + of SSD devices, while saving the hibernation snapshot image to + disk. Use this parameter to disable this feature for SSD + devices in scenarios when, such randomization is addressed at + the firmware level and hibenration image is not re-generated + frequently. + (Useful for improving hibernation resume time as snapshot pages + are available in disk serially and can be read in bigger chunks + without seeking) + retain_initrd [RAM] Keep initrd memory after extraction rfkill.default_state= diff --git a/kernel/power/swap.c b/kernel/power/swap.c index 91fffdd..8d5c811 100644 --- a/kernel/power/swap.c +++ b/kernel/power/swap.c @@ -44,6 +44,7 @@ u32 swsusp_hardware_signature; */ static bool clean_pages_on_read; static bool clean_pages_on_decompress; +static bool noswap_randomize; /* * The swap map is a data structure used for keeping track of each page @@ -1616,3 +1617,11 @@ static int __init swsusp_header_init(void) } core_initcall(swsusp_header_init); + +static int __init noswap_randomize_setup(char *str) +{ + noswap_randomize = true; + return 1; +} + +__setup("noswap_randomize", noswap_randomize_setup);