From mboxrd@z Thu Jan 1 00:00:00 1970 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 97A7FD730B5 for ; Fri, 3 Apr 2026 07:40:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D5FDC6B0005; Fri, 3 Apr 2026 03:40:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D38036B0089; Fri, 3 Apr 2026 03:40:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C74896B008A; Fri, 3 Apr 2026 03:40:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id B8D9D6B0005 for ; Fri, 3 Apr 2026 03:40:42 -0400 (EDT) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 6DCC6E07DE for ; Fri, 3 Apr 2026 07:40:42 +0000 (UTC) X-FDA: 84616447524.09.EF5949D Received: from out-178.mta1.migadu.com (out-178.mta1.migadu.com [95.215.58.178]) by imf15.hostedemail.com (Postfix) with ESMTP id 7E2C7A000D for ; Fri, 3 Apr 2026 07:40:40 +0000 (UTC) Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="vrmH/sJ1"; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf15.hostedemail.com: domain of hao.li@linux.dev designates 95.215.58.178 as permitted sender) smtp.mailfrom=hao.li@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1775202041; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:references:dkim-signature; bh=Ln5XzWMFyTginHCaMgw8DBIoTgwuT8dHU7rE/Vwl3Rg=; b=8T2rL9oVIpfX8sQPKalOfOgmx9i3Fcc5aG8QRoU0l1ISEdi+EyS8L43ObIlr7zqYh+OEpg Vc0uLQOCdsqJiJzpbsoAFBYu3abBLr4pleXjwUY+Syl7Wt4hQsvUDJFVwl/Aa45Tg8AQOV S6l0ukD08EYazx7z/od8ILeZqIqmPBE= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1775202041; a=rsa-sha256; cv=none; b=aabj28P6qql1ITGnc6uLf2NHdptUvx6MgLcrLe8PGSvM9vxMu1WhnpNoLAX4AANVpOEpYe iEcff4fH2K51Wo5AFN0CHc6WsTc5ppik18ykdTi2Vi41ao2GCU2tuvEgye1rW3finX7oMf s/QMPNNr+WhWAhifJei+DTCSTvIxFEQ= ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="vrmH/sJ1"; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf15.hostedemail.com: domain of hao.li@linux.dev designates 95.215.58.178 as permitted sender) smtp.mailfrom=hao.li@linux.dev X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1775202038; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=Ln5XzWMFyTginHCaMgw8DBIoTgwuT8dHU7rE/Vwl3Rg=; b=vrmH/sJ195nnxnWxwc5peq/lAcTBTfLjp7Pra4SR4+bkQWxopN7e2Koq7r6wRcIZGaZKN4 6COnGKYwqHEyKqbgf7PmI+K2zOGAc68s/Fjcg+ZRrvGZshZbjS37udLq8dSKZEkvF7G1ly 93BRL71+pjphdSe2J2TKup50yvZtkHA= From: Hao Li To: vbabka@kernel.org, harry.yoo@oracle.com, akpm@linux-foundation.org Cc: cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hao Li Subject: [PATCH] slub: use N_NORMAL_MEMORY in can_free_to_pcs to handle remote frees Date: Fri, 3 Apr 2026 15:37:36 +0800 Message-ID: <20260403073958.8722-1-hao.li@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 7E2C7A000D X-Stat-Signature: tn1ug1psmgm6fhr7dwfdon4bcw1xk8nk X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1775202040-566500 X-HE-Meta: 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 TekWT4Mm GSELInnY1QC/+/tHC/KapZcpVK/Zd+AIEphmuE2WHHQ0MtzOdUfn3mlgQyi7c0JZ88dZRsFclfy0ZzcHw9BGxZX9dl72xNrXSbyRdGEy3bNiB6B2mW1UFwY+nkWe+nAEYMsqIaM4Hw3c4lqXWqilUWOjko/0xztNnH0z7ARjtPZnfYF3dHfLIYKCzF5AVMHab7BSNVi+fCz9DbUni6nwWF84+EvOmXE+VaYrldjKeSw823i0BBunsNbZ09f9zmG2fAC5tzrcPRDpm/0U= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Memory hotplug now keeps N_NORMAL_MEMORY up to date correctly, so make can_free_to_pcs() use it. As a result, when freeing objects on memoryless nodes, or on nodes that have memory but only in ZONE_MOVABLE, the objects can be freed to the sheaf instead of going through the slow path. Signed-off-by: Hao Li --- Hi Vlastimil, this patch depends on a prerequisite patch[1] from a few days ago. I'm not sure how this should be handled. I wonder if Andrew might put them in the same tree. [1] https://lore.kernel.org/linux-mm/20260330035941.518186-1-hao.li@linux.dev/ --- mm/slub.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index fb2c5c57bc4e..4927407c9699 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -6022,14 +6022,15 @@ static __always_inline bool can_free_to_pcs(struct slab *slab) goto check_pfmemalloc; /* - * Freed object isn't from this cpu's node, but that node is memoryless. + * Freed object isn't from this cpu's node, but that node is memoryless + * or only has ZONE_MOVABLE memory, which slab cannot allocate from. * Proceed as it's better to cache remote objects than falling back to * the slowpath for everything. The allocation side can never obtain * a local object anyway, if none exist. We don't have numa_mem_id() to * point to the closest node as we would on a proper memoryless node * setup. */ - if (unlikely(!node_state(numa_node, N_MEMORY))) + if (unlikely(!node_state(numa_node, N_NORMAL_MEMORY))) goto check_pfmemalloc; #endif -- 2.50.1