From nobody Tue Feb 10 15:45:49 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=fail(p=none dis=none) header.from=arm.com Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1647617182944636.4779367303009; Fri, 18 Mar 2022 08:26:22 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.292107.496115 (Exim 4.92) (envelope-from ) id 1nVEUP-0003Tc-T1; Fri, 18 Mar 2022 15:26:05 +0000 Received: by outflank-mailman (output) from mailman id 292107.496115; Fri, 18 Mar 2022 15:26:05 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nVEUP-0003T7-NH; Fri, 18 Mar 2022 15:26:05 +0000 Received: by outflank-mailman (input) for mailman id 292107; Fri, 18 Mar 2022 15:26:04 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nVEUN-0001ka-R9 for xen-devel@lists.xenproject.org; Fri, 18 Mar 2022 15:26:03 +0000 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by se1-gles-flk1.inumbo.com (Halon) with ESMTP id b8847dc5-a6cf-11ec-853c-5f4723681683; Fri, 18 Mar 2022 16:26:02 +0100 (CET) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 34AF51570; Fri, 18 Mar 2022 08:26:02 -0700 (PDT) Received: from e125770.cambridge.arm.com (e125770.cambridge.arm.com [10.1.195.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BC5C43F7D7; Fri, 18 Mar 2022 08:26:00 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: b8847dc5-a6cf-11ec-853c-5f4723681683 From: Luca Fancellu To: xen-devel@lists.xenproject.org Cc: bertrand.marquis@arm.com, wei.chen@arm.com, Andrew Cooper , George Dunlap , Jan Beulich , Julien Grall , Stefano Stabellini , Wei Liu , Juergen Gross , Dario Faggioli Subject: [PATCH v3 6/6] xen/cpupool: Allow cpupool0 to use different scheduler Date: Fri, 18 Mar 2022 15:25:41 +0000 Message-Id: <20220318152541.7460-7-luca.fancellu@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220318152541.7460-1-luca.fancellu@arm.com> References: <20220318152541.7460-1-luca.fancellu@arm.com> X-ZM-MESSAGEID: 1647617191098100001 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Currently cpupool0 can use only the default scheduler, and cpupool_create has an hardcoded behavior when creating the pool 0 that doesn't allocate new memory for the scheduler, but uses the default scheduler structure in memory. With this commit it is possible to allocate a different scheduler for the cpupool0 when using the boot time cpupool. To achieve this the hardcoded behavior in cpupool_create is removed and the cpupool0 creation is moved. When compiling without boot time cpupools enabled, the current behavior is maintained (except that cpupool0 scheduler memory will be allocated). Signed-off-by: Luca Fancellu --- Changes in v3: - fix typo in commit message (Juergen) - rebase changes Changes in v2: - new patch --- xen/common/boot_cpupools.c | 5 ++++- xen/common/sched/cpupool.c | 8 +------- xen/include/xen/sched.h | 5 ++++- 3 files changed, 9 insertions(+), 9 deletions(-) diff --git a/xen/common/boot_cpupools.c b/xen/common/boot_cpupools.c index feba93a243fc..af5bea0c1113 100644 --- a/xen/common/boot_cpupools.c +++ b/xen/common/boot_cpupools.c @@ -175,8 +175,11 @@ void __init btcpupools_allocate_pools(void) if ( add_extra_cpupool ) next_pool_id++; =20 + /* Keep track of cpupool id 0 with the global cpupool0 */ + cpupool0 =3D cpupool_create_pool(0, pool_sched_map[0]); + /* Create cpupools with selected schedulers */ - for ( i =3D 0; i < next_pool_id; i++ ) + for ( i =3D 1; i < next_pool_id; i++ ) cpupool_create_pool(i, pool_sched_map[i]); =20 #ifdef CONFIG_X86 diff --git a/xen/common/sched/cpupool.c b/xen/common/sched/cpupool.c index e5189c53a321..f717ee844e91 100644 --- a/xen/common/sched/cpupool.c +++ b/xen/common/sched/cpupool.c @@ -312,10 +312,7 @@ static struct cpupool *cpupool_create(unsigned int poo= lid, c->cpupool_id =3D q->cpupool_id + 1; } =20 - if ( poolid =3D=3D 0 ) - c->sched =3D scheduler_get_default(); - else - c->sched =3D scheduler_alloc(sched_id); + c->sched =3D scheduler_alloc(sched_id); if ( IS_ERR(c->sched) ) { ret =3D PTR_ERR(c->sched); @@ -1242,9 +1239,6 @@ static int __init cf_check cpupool_init(void) =20 cpupool_hypfs_init(); =20 - cpupool0 =3D cpupool_create(0, 0); - BUG_ON(IS_ERR(cpupool0)); - cpupool_put(cpupool0); register_cpu_notifier(&cpu_nfb); =20 btcpupools_dtb_parse(); diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 4e749a604f25..215b4f45609a 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -1188,7 +1188,10 @@ static inline void btcpupools_dtb_parse(void) {} #endif =20 #else /* !CONFIG_BOOT_TIME_CPUPOOLS */ -static inline void btcpupools_allocate_pools(void) {} +static inline void btcpupools_allocate_pools(void) +{ + cpupool0 =3D cpupool_create_pool(0, -1); +} static inline void btcpupools_dtb_parse(void) {} static inline unsigned int btcpupools_get_cpupool_id(unsigned int cpu) { --=20 2.17.1