Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932568AbcCBAOD (ORCPT ); Tue, 1 Mar 2016 19:14:03 -0500 Received: from mail333.us4.mandrillapp.com ([205.201.137.77]:57058 "EHLO mail333.us4.mandrillapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932459AbcCAX6M (ORCPT ); Tue, 1 Mar 2016 18:58:12 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; q=dns; s=mandrill; d=linuxfoundation.org; b=H5wtqLJ/kRdMyk3As5FL1QoRmauiLvs6OaD/MU2SBJql5GwxRiZ0MPjVq//vWWm1YeKnVnTMwHVL uqkPazwm0MIflfx0UzMEkaKnHp554cXfEhLF1vExWaz7qFlH5OP6zCI3es62TorPCV1myTNIBneg XmC5KeU4jsDooEStbd0=; From: Greg Kroah-Hartman Subject: [PATCH 4.4 300/342] KVM: async_pf: do not warn on page allocation failures X-Mailer: git-send-email 2.7.2 To: Cc: Greg Kroah-Hartman , , Christian Borntraeger , Dominik Dingel , Paolo Bonzini Message-Id: <20160301234537.596565702@linuxfoundation.org> In-Reply-To: <20160301234527.990448862@linuxfoundation.org> References: <20160301234527.990448862@linuxfoundation.org> X-Report-Abuse: Please forward a copy of this message, including all headers, to abuse@mandrill.com X-Report-Abuse: You can also report abuse here: http://mandrillapp.com/contact/abuse?id=30481620.bdc83196378e462d869c2d3ceb32a108 X-Mandrill-User: md_30481620 Date: Tue, 01 Mar 2016 23:55:25 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1875 Lines: 50 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christian Borntraeger commit d7444794a02ff655eda87e3cc54e86b940e7736f upstream. In async_pf we try to allocate with NOWAIT to get an element quickly or fail. This code also handle failures gracefully. Lets silence potential page allocation failures under load. qemu-system-s39: page allocation failure: order:0,mode:0x2200000 [...] Call Trace: ([<00000000001146b8>] show_trace+0xf8/0x148) [<000000000011476a>] show_stack+0x62/0xe8 [<00000000004a36b8>] dump_stack+0x70/0x98 [<0000000000272c3a>] warn_alloc_failed+0xd2/0x148 [<000000000027709e>] __alloc_pages_nodemask+0x94e/0xb38 [<00000000002cd36a>] new_slab+0x382/0x400 [<00000000002cf7ac>] ___slab_alloc.constprop.30+0x2dc/0x378 [<00000000002d03d0>] kmem_cache_alloc+0x160/0x1d0 [<0000000000133db4>] kvm_setup_async_pf+0x6c/0x198 [<000000000013dee8>] kvm_arch_vcpu_ioctl_run+0xd48/0xd58 [<000000000012fcaa>] kvm_vcpu_ioctl+0x372/0x690 [<00000000002f66f6>] do_vfs_ioctl+0x3be/0x510 [<00000000002f68ec>] SyS_ioctl+0xa4/0xb8 [<0000000000781c5e>] system_call+0xd6/0x264 [<000003ffa24fa06a>] 0x3ffa24fa06a Signed-off-by: Christian Borntraeger Reviewed-by: Dominik Dingel Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- virt/kvm/async_pf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/virt/kvm/async_pf.c +++ b/virt/kvm/async_pf.c @@ -173,7 +173,7 @@ int kvm_setup_async_pf(struct kvm_vcpu * * do alloc nowait since if we are going to sleep anyway we * may as well sleep faulting in page */ - work = kmem_cache_zalloc(async_pf_cache, GFP_NOWAIT); + work = kmem_cache_zalloc(async_pf_cache, GFP_NOWAIT | __GFP_NOWARN); if (!work) return 0;