From nobody Sun Apr 12 04:22:48 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 997CFC19F28 for ; Wed, 3 Aug 2022 10:05:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236405AbiHCKF2 (ORCPT ); Wed, 3 Aug 2022 06:05:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233362AbiHCKFY (ORCPT ); Wed, 3 Aug 2022 06:05:24 -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 BA67E2C0 for ; Wed, 3 Aug 2022 03:05:23 -0700 (PDT) Received: by mail-pf1-x433.google.com with SMTP id 17so16065983pfy.0 for ; Wed, 03 Aug 2022 03:05:23 -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=ipjbvHg48fVyW4jVX5gIjrnxkQ8/Uun3HS5plAciRpFp9N9V56WtAuDOfPwusWnA0M Ra3acdntu7vD9oDei3ZjYZSowPGpmY07igPy8HRpVLkeTkcf31OxvmQ+go0em31ADw2e xdPeXir+TMMAUQfNFeBjzEWoAsiIjC4BmO0xeqiO4pqM8SABLHZjevqyqoxRcIqtfqsO QpROXLlVD+2olAHOIGCTIU5YWCf1IkbU4LJf1AEX7ZQI0AHQPwQRKNc9+Tr6t91wITSV W9wIQoLg2vLppCaaIrBWQx3tzEu90iHp/9ztRKJxAbAa4Jj6VCf5dDziuLsHdXDuscqC Zwzg== 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=pPOY/FxMoVLrth/w7LWHY2TSIO9nypoFg0oLAV2B3NKIL00Go596fmI+oxkqu3LV41 Na+WoFDDHZKg5Iu1Vb0D3cVfiGsCejUgPiNqLybIHcotkMsgozhKVNu4UJur9XLTvuys /OsqbOqS4EdTCB8XlZ4ZpaQpbEsz4Jp5o35YTEG8bdW5ST95W/wE9YEq3m5pN4rlDXnb VrOi5UpEUikNAXKOGQRssBHs9WspwtwluqP5mP5GvpIKQEC+Z7wkc2Z21wtP0DHLnVtR 1QBzBN8/9tlMTFYSbwderTgoAbaOUlyWnxC1O55Flwx30Yej5ED5K4mzbeu4+DuA8QPp gwPg== X-Gm-Message-State: AJIora/z2651XNAQtwMFcA3S3KWJTzPsC+wkS60lt9yFPreH1+QuCS0n TgIp5XbaT6Rooruyvz+i3bFSuL9KZ5s= X-Google-Smtp-Source: AGRyM1saowNGHUEc91GATroNAs1Ulpr9zGAqAodgHMmGAOrGXpFhOyI9NrSJEWMx+FVvZRavoC9blg== X-Received: by 2002:a63:c10a:0:b0:41b:f15:f9c4 with SMTP id w10-20020a63c10a000000b0041b0f15f9c4mr20763742pgf.72.1659521123115; Wed, 03 Aug 2022 03:05:23 -0700 (PDT) Received: from localhost.localdomain ([193.203.214.57]) by smtp.gmail.com with ESMTPSA id k14-20020a170902d58e00b0016b90620910sm1455917plh.71.2022.08.03.03.05.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Aug 2022 03:05:22 -0700 (PDT) From: cgel.zte@gmail.com X-Google-Original-From: xu.xin16@zte.con.cn To: akpm@linux-foundation.org Cc: hughd@google.com, izik.eidus@ravellosystems.com, willy@infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, xu xin , CGEL Subject: [RFC PATCH 1/4] ksm: propose a auto-run mode of ksm Date: Wed, 3 Aug 2022 10:05:14 +0000 Message-Id: <20220803100514.1653440-1-xu.xin16@zte.con.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220803100306.1653382-1-xu.xin16@zte.con.cn> References: <20220803100306.1653382-1-xu.xin16@zte.con.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