From nobody Sat Feb 7 15:05:26 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 F1F01C25B08 for ; Mon, 15 Aug 2022 23:10:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233096AbiHOXKR (ORCPT ); Mon, 15 Aug 2022 19:10:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353278AbiHOXHk (ORCPT ); Mon, 15 Aug 2022 19:07:40 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0EC7D1436DB; Mon, 15 Aug 2022 12:59:41 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2F25161226; Mon, 15 Aug 2022 19:59:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2FFB5C433C1; Mon, 15 Aug 2022 19:59:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660593579; bh=Pz3tTLwJMRiGBif8JSeF3IXDhjB3n2Y2I1XT1uepea8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pyU8inuhFUktWzkC9CLUQ2lMejzQuLOELO+ji1mo1NEdqGsAS7dJuLcABOIhhk2a4 e6yG9bLvf0YEYZtFYDvDJb7CwR7gO278yLfb0//k5S48fD9+oiB64PXHYjg4AWp/Aa JpuFmpffUt37I1SH0uhGufKUqtR9Onp47X/KYZlM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mel Gorman , "Peter Zijlstra (Intel)" , K Prateek Nayak , Sasha Levin Subject: [PATCH 5.19 0291/1157] sched/numa: Initialise numa_migrate_retry Date: Mon, 15 Aug 2022 19:54:07 +0200 Message-Id: <20220815180451.263889074@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180439.416659447@linuxfoundation.org> References: <20220815180439.416659447@linuxfoundation.org> User-Agent: quilt/0.67 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: Mel Gorman [ Upstream commit 70ce3ea9aa4ed901c8a90de667df5ef307766e71 ] On clone, numa_migrate_retry is inherited from the parent which means that the first NUMA placement of a task is non-deterministic. This affects when load balancing recognises numa tasks and whether to migrate "regular", "remote" or "all" tasks between NUMA scheduler domains. Signed-off-by: Mel Gorman Signed-off-by: Peter Zijlstra (Intel) Tested-by: K Prateek Nayak Link: https://lore.kernel.org/r/20220520103519.1863-2-mgorman@techsingulari= ty.net Signed-off-by: Sasha Levin --- kernel/sched/fair.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 9d6058b0a3d4..0cba1b2e295b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2885,6 +2885,7 @@ void init_numa_balancing(unsigned long clone_flags, s= truct task_struct *p) p->node_stamp =3D 0; p->numa_scan_seq =3D mm ? mm->numa_scan_seq : 0; p->numa_scan_period =3D sysctl_numa_balancing_scan_delay; + p->numa_migrate_retry =3D 0; /* Protect against double add, see task_tick_numa and task_numa_work */ p->numa_work.next =3D &p->numa_work; p->numa_faults =3D NULL; --=20 2.35.1