From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [160.30.148.34]) (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 B5F722C11CF for ; Fri, 6 Feb 2026 09:58:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=160.30.148.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770371888; cv=none; b=Pyg8EnAEJCyEOGYPWs3eb9jURhbWEmUXWg6lCvDUcQsKAxBM5dqY+cJRcdR2lhlHgyMVrVDmQBtuN4ySYc+ucOcB2ZIp37cQlDlxM8Vq0x6K2iOCA3OIp9QTy0AZRnN+tCIsUzLrOuqfUObaPg6yYtR2dz8XKh3I2deFo5SPDBA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770371888; c=relaxed/simple; bh=aNuwTMOYF8IhgHHqDSWzxPocv7fYpUdmDd/e20G7KhE=; h=Message-ID:In-Reply-To:References:Date:Mime-Version:From:To:Cc: Subject:Content-Type; b=jQkmErP3K9lpZMSqoGg2+GeEHCzH7f/SPufHhVVvda4TYQ5Tp0nrXhYzQwDU+xq+nGQxolsFebfZovU7T1v1uKB1XXTwX1iGbvEFAqTIhRj5WVr0R6SvI+y4VuUtICAuOidZ262ow+ZDo14pjgj1AogZcW1NBYDvFaD5kNImoXw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zte.com.cn; spf=pass smtp.mailfrom=zte.com.cn; arc=none smtp.client-ip=160.30.148.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zte.com.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zte.com.cn Received: from mse-fl1.zte.com.cn (unknown [10.5.228.132]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mxhk.zte.com.cn (FangMail) with ESMTPS id 4f6qK35vYlz5B1K3; Fri, 06 Feb 2026 17:57:59 +0800 (CST) Received: from xaxapp02.zte.com.cn ([10.88.97.241]) by mse-fl1.zte.com.cn with SMTP id 6169vg3f001817; Fri, 6 Feb 2026 17:57:42 +0800 (+08) (envelope-from xu.xin16@zte.com.cn) Received: from mapi (xaxapp02[null]) by mapi (Zmail) with MAPI id mid32; Fri, 6 Feb 2026 17:57:45 +0800 (CST) X-Zmail-TransId: 2afa6985bb19e39-1d165 X-Mailer: Zmail v1.0 Message-ID: <20260206175745201sbMJ9Ru8QZsjAo7YMopKS@zte.com.cn> In-Reply-To: <20260206175609696_A7uH3a1F7VmQN-iTzjC3@zte.com.cn> References: 20260206175609696_A7uH3a1F7VmQN-iTzjC3@zte.com.cn Date: Fri, 6 Feb 2026 17:57:45 +0800 (CST) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 From: To: , , Cc: , , , , , Subject: =?UTF-8?B?W1BBVENIIHYyIDEvMl0ga3NtOiBJbml0aWFsaXplIHRoZSBhZGRyIG9ubHkgb25jZSBpbiBybWFwX3dhbGtfa3Nt?= Content-Type: text/plain; charset="UTF-8" X-MAIL:mse-fl1.zte.com.cn 6169vg3f001817 X-TLS: YES X-SPF-DOMAIN: zte.com.cn X-ENVELOPE-SENDER: xu.xin16@zte.com.cn X-SPF: None X-SOURCE-IP: 10.5.228.132 unknown Fri, 06 Feb 2026 17:57:59 +0800 X-Fangmail-Anti-Spam-Filtered: true X-Fangmail-MID-QID: 6985BB27.002/4f6qK35vYlz5B1K3 From: xu xin This is a minor performance optimization, especially when there are many for-loop iterations, because the addr variable doesn’t change across iterations. Therefore, it only needs to be initialized once before the loop. Signed-off-by: xu xin --- mm/ksm.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/mm/ksm.c b/mm/ksm.c index 2d89a7c8b4eb..950e122bcbf4 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -3168,6 +3168,8 @@ void rmap_walk_ksm(struct folio *folio, struct rmap_walk_control *rwc) return; again: hlist_for_each_entry(rmap_item, &stable_node->hlist, hlist) { + /* Ignore the stable/unstable/sqnr flags */ + const unsigned long addr = rmap_item->address & PAGE_MASK; struct anon_vma *anon_vma = rmap_item->anon_vma; struct anon_vma_chain *vmac; struct vm_area_struct *vma; @@ -3180,16 +3182,13 @@ void rmap_walk_ksm(struct folio *folio, struct rmap_walk_control *rwc) } anon_vma_lock_read(anon_vma); } + anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root, 0, ULONG_MAX) { - unsigned long addr; cond_resched(); vma = vmac->vma; - /* Ignore the stable/unstable/sqnr flags */ - addr = rmap_item->address & PAGE_MASK; - if (addr < vma->vm_start || addr >= vma->vm_end) continue; /* -- 2.25.1