From nobody Mon Feb 9 05:40:45 2026 Received: from out-184.mta0.migadu.com (out-184.mta0.migadu.com [91.218.175.184]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ECB2037153 for ; Mon, 19 Feb 2024 13:34:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.184 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708349671; cv=none; b=CbUfHhnnbF5+sVYDisWkM2ptAUBXqQZDeWTSqIER0aF2WSnJGvakR8JvBaHL9TyABiP0VwdFzT6+bohaOVfn8C64/2d2Vd3YNMMgl8p9bsdf1FEkjVwtyRGJ6g4AdMVXy1NUzTOcnVuIQ/tA1glfTYmU4OEvU06RAE0sm2610/c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708349671; c=relaxed/simple; bh=4NV6DsrM5S+/h7ppU/k8FOJs/bnqzH3nRRreQTC9eDs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=jADPpBR9m7IInlRia2KYhh2g+kbq8EziZ24rbubQluLhsQiVB9JCLuN/qYHiL/+Bh+rR5J1CGbvvnSgIMbLWIqvNIdwHqj5j77nCg+2VA1PYz+88ejHyR4+47nkP1cScOx+heuB7UEE3U7fcso3Tf+hiHD39UZQv7RdldJquCKo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=bytedance.com; spf=pass smtp.mailfrom=linux.dev; arc=none smtp.client-ip=91.218.175.184 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=bytedance.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Chengming Zhou Date: Mon, 19 Feb 2024 13:33:53 +0000 Subject: [PATCH 3/3] mm/zsmalloc: remove unused zspage->isolated Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240219-b4-szmalloc-migrate-v1-3-34cd49c6545b@bytedance.com> References: <20240219-b4-szmalloc-migrate-v1-0-34cd49c6545b@bytedance.com> In-Reply-To: <20240219-b4-szmalloc-migrate-v1-0-34cd49c6545b@bytedance.com> To: nphamcs@gmail.com, yosryahmed@google.com, Sergey Senozhatsky , Minchan Kim , Andrew Morton , hannes@cmpxchg.org Cc: linux-mm@kvack.org, Chengming Zhou , linux-kernel@vger.kernel.org X-Migadu-Flow: FLOW_OUT The zspage->isolated is not used anywhere, we don't need to maintain it, which needs to hold the heavy pool lock to update it, so just remove it. Signed-off-by: Chengming Zhou --- mm/zsmalloc.c | 32 -------------------------------- 1 file changed, 32 deletions(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index f2ae7d4c6f21..a48f4651d143 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -116,7 +116,6 @@ #define HUGE_BITS 1 #define FULLNESS_BITS 4 #define CLASS_BITS 8 -#define ISOLATED_BITS 5 #define MAGIC_VAL_BITS 8 =20 #define MAX(a, b) ((a) >=3D (b) ? (a) : (b)) @@ -246,7 +245,6 @@ struct zspage { unsigned int huge:HUGE_BITS; unsigned int fullness:FULLNESS_BITS; unsigned int class:CLASS_BITS + 1; - unsigned int isolated:ISOLATED_BITS; unsigned int magic:MAGIC_VAL_BITS; }; unsigned int inuse; @@ -1732,17 +1730,6 @@ static void migrate_write_unlock(struct zspage *zspa= ge) } =20 #ifdef CONFIG_COMPACTION -/* Number of isolated subpage for *page migration* in this zspage */ -static void inc_zspage_isolation(struct zspage *zspage) -{ - zspage->isolated++; -} - -static void dec_zspage_isolation(struct zspage *zspage) -{ - VM_BUG_ON(zspage->isolated =3D=3D 0); - zspage->isolated--; -} =20 static const struct movable_operations zsmalloc_mops; =20 @@ -1771,21 +1758,12 @@ static void replace_sub_page(struct size_class *cla= ss, struct zspage *zspage, =20 static bool zs_page_isolate(struct page *page, isolate_mode_t mode) { - struct zs_pool *pool; - struct zspage *zspage; - /* * Page is locked so zspage couldn't be destroyed. For detail, look at * lock_zspage in free_zspage. */ VM_BUG_ON_PAGE(PageIsolated(page), page); =20 - zspage =3D get_zspage(page); - pool =3D zspage->pool; - spin_lock(&pool->lock); - inc_zspage_isolation(zspage); - spin_unlock(&pool->lock); - return true; } =20 @@ -1850,7 +1828,6 @@ static int zs_page_migrate(struct page *newpage, stru= ct page *page, kunmap_atomic(s_addr); =20 replace_sub_page(class, zspage, newpage, page); - dec_zspage_isolation(zspage); /* * Since we complete the data copy and set up new zspage structure, * it's okay to release the pool's lock. @@ -1872,16 +1849,7 @@ static int zs_page_migrate(struct page *newpage, str= uct page *page, =20 static void zs_page_putback(struct page *page) { - struct zs_pool *pool; - struct zspage *zspage; - VM_BUG_ON_PAGE(!PageIsolated(page), page); - - zspage =3D get_zspage(page); - pool =3D zspage->pool; - spin_lock(&pool->lock); - dec_zspage_isolation(zspage); - spin_unlock(&pool->lock); } =20 static const struct movable_operations zsmalloc_mops =3D { --=20 b4 0.10.1