From patchwork Tue Aug 10 09:48:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoquan He X-Patchwork-Id: 12428559 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F17F5C4338F for ; Tue, 10 Aug 2021 09:49:15 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9C83B61076 for ; Tue, 10 Aug 2021 09:49:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 9C83B61076 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id D19616B007D; Tue, 10 Aug 2021 05:49:14 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C03C96B007B; Tue, 10 Aug 2021 05:49:14 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AA3628D0001; Tue, 10 Aug 2021 05:49:14 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0074.hostedemail.com [216.40.44.74]) by kanga.kvack.org (Postfix) with ESMTP id 8D9026B0078 for ; Tue, 10 Aug 2021 05:49:14 -0400 (EDT) Received: from smtpin36.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 421EE8249980 for ; Tue, 10 Aug 2021 09:49:14 +0000 (UTC) X-FDA: 78458697828.36.AD5A38B Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf15.hostedemail.com (Postfix) with ESMTP id F1CE4D0004AD for ; Tue, 10 Aug 2021 09:49:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1628588953; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=j/EQ6+OMl4MXWKt0VGOxH4vRyLnzoc9qFt3VsEGqLrU=; b=AUdptr7Fw8OiMsoX+Dj6LicXvOS9zs0TAggpiV+IuH4d87mS5JKSWm2raO3N/WTDOxJrPW +5BJtnRHhzhn3JZR9hq7CQqbL2k7k/wq8mi23J1hHPIpznxkKpV4a7sm7g1d4rSyj0/l/G 3YoHgEcWSLzSsfQwzY0NBxFhD+0SRAA= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-68-v8RYn7x8Nh6PHDqNUKPg0g-1; Tue, 10 Aug 2021 05:49:12 -0400 X-MC-Unique: v8RYn7x8Nh6PHDqNUKPg0g-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9A988875049; Tue, 10 Aug 2021 09:49:10 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (ovpn-12-79.pek2.redhat.com [10.72.12.79]) by smtp.corp.redhat.com (Postfix) with ESMTP id 21D481036D33; Tue, 10 Aug 2021 09:49:05 +0000 (UTC) From: Baoquan He To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, akpm@linux-foundation.org, hch@lst.de, robin.murphy@arm.com, cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, vbabka@suse.cz, m.szyprowski@samsung.com, rppt@linux.ibm.com, Baoquan He Subject: [RFC PATCH v2 5/5] mm/slub: do not create dma-kmalloc if no managed pages in DMA zone Date: Tue, 10 Aug 2021 17:48:35 +0800 Message-Id: <20210810094835.13402-6-bhe@redhat.com> In-Reply-To: <20210810094835.13402-1-bhe@redhat.com> References: <20210810094835.13402-1-bhe@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: F1CE4D0004AD Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=AUdptr7F; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf15.hostedemail.com: domain of bhe@redhat.com has no SPF policy when checking 170.10.133.124) smtp.mailfrom=bhe@redhat.com X-Stat-Signature: 7mtexrtqiipbpq6ywbiumpa9c14r69hq X-HE-Tag: 1628588953-224661 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Dma-kmalloc will be created as long as CONFIG_ZONE_DMA is enabled. However, it will fail if DMA zone has no managed pages. The failure can be seen in kdump kernel of x86_64 as below: CPU: 0 PID: 65 Comm: kworker/u2:1 Not tainted 5.14.0-rc2+ #9 Hardware name: Intel Corporation SandyBridge Platform/To be filled by O.E.M., BIOS RMLSDP.86I.R2.28.D690.1306271008 06/27/2013 Workqueue: events_unbound async_run_entry_fn Call Trace: dump_stack_lvl+0x57/0x72 warn_alloc.cold+0x72/0xd6 __alloc_pages_slowpath.constprop.0+0xf56/0xf70 __alloc_pages+0x23b/0x2b0 allocate_slab+0x406/0x630 ___slab_alloc+0x4b1/0x7e0 ? sr_probe+0x200/0x600 ? lock_acquire+0xc4/0x2e0 ? fs_reclaim_acquire+0x4d/0xe0 ? lock_is_held_type+0xa7/0x120 ? sr_probe+0x200/0x600 ? __slab_alloc+0x67/0x90 __slab_alloc+0x67/0x90 ? sr_probe+0x200/0x600 ? sr_probe+0x200/0x600 kmem_cache_alloc_trace+0x259/0x270 sr_probe+0x200/0x600 ...... bus_probe_device+0x9f/0xb0 device_add+0x3d2/0x970 ...... __scsi_add_device+0xea/0x100 ata_scsi_scan_host+0x97/0x1d0 async_run_entry_fn+0x30/0x130 process_one_work+0x2b0/0x5c0 worker_thread+0x55/0x3c0 ? process_one_work+0x5c0/0x5c0 kthread+0x149/0x170 ? set_kthread_struct+0x40/0x40 ret_from_fork+0x22/0x30 Mem-Info: ...... The above failure happened when calling kmalloc() to allocate buffer with GFP_DMA. It requests to allocate slab page from DMA zone while no managed pages in there. sr_probe() --> get_capabilities() --> buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); The DMA zone should be checked if it has managed pages, then try to create dma-kmalloc. Signed-off-by: Baoquan He Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim Cc: Vlastimil Babka --- mm/slab_common.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/slab_common.c b/mm/slab_common.c index 1c673c323baf..22350bef3bae 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -911,10 +911,16 @@ void __init create_kmalloc_caches(slab_flags_t flags) slab_state = UP; #ifdef CONFIG_ZONE_DMA + bool managed_dma = has_managed_dma(); + for (i = 0; i <= KMALLOC_SHIFT_HIGH; i++) { struct kmem_cache *s = kmalloc_caches[KMALLOC_NORMAL][i]; if (s) { + if (!managed_dma) { + kmalloc_caches[KMALLOC_DMA][i] = kmalloc_caches[KMALLOC_NORMAL][i]; + continue; + } kmalloc_caches[KMALLOC_DMA][i] = create_kmalloc_cache( kmalloc_info[i].name[KMALLOC_DMA], kmalloc_info[i].size,