From nobody Mon Apr 13 13:32:48 2026 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 7255CC00140 for ; Fri, 12 Aug 2022 10:12:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238168AbiHLKMf (ORCPT ); Fri, 12 Aug 2022 06:12:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34680 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238103AbiHLKMA (ORCPT ); Fri, 12 Aug 2022 06:12:00 -0400 Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E5567A98C6 for ; Fri, 12 Aug 2022 03:11:57 -0700 (PDT) Received: by mail-pf1-x433.google.com with SMTP id p125so563905pfp.2 for ; Fri, 12 Aug 2022 03:11:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc; bh=V7yMXZa3MywkOFBvlYMPqSqmCaZ5JNGIAqlkaSLZ/kM=; b=GUsQrErKwYfApaFW7t1aycaDDOcT4RNUbr8JoqRV/JeKU6zJZtEoluxB2oppeJz+c+ uicrtsV0V2YYg4yrptx59NDO9hjcFwCQiWINbbZGDntxrXtgrUandYeo6JfRBNNiXqkO X+F5nDt6ITpzGdKmFJoiXZrl/hWAbj0LnZXL3QzrrrQwOS+wwzlGzn3bCbcHPl445y+U nk6kGyOxAT30qQy9rI9gbbQR79VBd0/FrHsxTCpwyW0NOfsh42UQiDnh6mRvNi2gHABd Klf3QM2nSSx8nIdpGoCKb1s+uqWvK8CgBYm/CnLRpaCRweC3Ap/D0sRqbw92h24VZ2TH Ol6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=V7yMXZa3MywkOFBvlYMPqSqmCaZ5JNGIAqlkaSLZ/kM=; b=dQGTBADCeQpwRvmZCzvHjI+GMZb/vzS/kr+AEqQq5feGxAzpBsTQCMzs49qU2+x6KK uT9/uXiaQWV2jR2zZIZ4j3sEhfpuMZ6RHX59Hah0UMg5446kTDGCqqn+hvuG3tfFt5rt zY0TxEGFMxOZKNcyqWw0MGiVTkZp6jdpko70Id0Sdp3iNSSFgim37Ux6nH8nlWP2oEjx JkNT2OGCUNTVtmMBN9W8198sARRt8mmviBp09AaEYcUzzpYkYiqz7gKT5P53Dm86yQJw LsJ7ec4xzig0sQVmwIYmjbjlx22DGkbYdQ1+AKWdQW36X02y1TUSAT8wRGjElj1mLZtA mk0g== X-Gm-Message-State: ACgBeo3LGVpJxQ4TxUJ2Brhmxhvbviyq/+qS6dFgFwh5EgLGmQ4Ehsd6 C0jB1Bd2kxWipVhnWzT2dJNgVVE8GWk= X-Google-Smtp-Source: AA6agR7ruzvjPLVoqRS4ooTCRVR7Zek3i441oZSHEk/8OA3W9OWSqoZisu1kEC4y/u4cMpl7eVVPYw== X-Received: by 2002:a05:6a00:328e:b0:52d:44e0:297c with SMTP id ck14-20020a056a00328e00b0052d44e0297cmr2943039pfb.64.1660299117343; Fri, 12 Aug 2022 03:11:57 -0700 (PDT) Received: from localhost.localdomain ([193.203.214.57]) by smtp.gmail.com with ESMTPSA id gq20-20020a17090b105400b001f52fa1704csm16110031pjb.3.2022.08.12.03.11.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Aug 2022 03:11:57 -0700 (PDT) From: cgel.zte@gmail.com X-Google-Original-From: xu.xin16@zte.com.cn To: akpm@linux-foundation.org, willy@infradead.org Cc: hughd@google.com, izik.eidus@ravellosystems.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, xu.xin16@zte.com.cn, CGEL Subject: [PATCH v2 1/5] ksm: add a auto-run mode of ksm Date: Fri, 12 Aug 2022 10:11:52 +0000 Message-Id: <20220812101152.41479-1-xu.xin16@zte.com.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220812101102.41422-1-xu.xin16@zte.com.cn> References: <20220812101102.41422-1-xu.xin16@zte.com.cn> 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: xu xin Add a new running state auto-mode to ksm. This is to pave the way for subsequent real optimization features. Use it by: echo 8 > /sys/kernel/mm/ksm/run Signed-off-by: xu xin Signed-off-by: CGEL --- mm/ksm.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/mm/ksm.c b/mm/ksm.c index 2f315c69fa2c..c80d908221a4 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -290,6 +290,7 @@ static int ksm_nr_node_ids =3D 1; #define KSM_RUN_MERGE 1 #define KSM_RUN_UNMERGE 2 #define KSM_RUN_OFFLINE 4 +#define KSM_RUN_AUTO 8 static unsigned long ksm_run =3D KSM_RUN_STOP; static void wait_while_offlining(void); =20 @@ -2416,7 +2417,9 @@ static void ksm_do_scan(unsigned int scan_npages) =20 static int ksmd_should_run(void) { - return (ksm_run & KSM_RUN_MERGE) && !list_empty(&ksm_mm_head.mm_list); + if (!list_empty(&ksm_mm_head.mm_list)) + return ksm_run & KSM_RUN_AUTO || ksm_run & KSM_RUN_MERGE; + return 0; } =20 static int ksm_scan_thread(void *nothing) @@ -2916,7 +2919,7 @@ static ssize_t run_store(struct kobject *kobj, struct= kobj_attribute *attr, err =3D kstrtouint(buf, 10, &flags); if (err) return -EINVAL; - if (flags > KSM_RUN_UNMERGE) + if (flags > KSM_RUN_UNMERGE && flags !=3D KSM_RUN_AUTO) return -EINVAL; =20 /* @@ -2942,7 +2945,7 @@ static ssize_t run_store(struct kobject *kobj, struct= kobj_attribute *attr, } mutex_unlock(&ksm_thread_mutex); =20 - if (flags & KSM_RUN_MERGE) + if (flags & KSM_RUN_MERGE || flags & KSM_RUN_AUTO) wake_up_interruptible(&ksm_thread_wait); =20 return count; --=20 2.25.1