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Thu, 30 Apr 2020 19:02:25 +0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 03UJ2M2B24772748 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 30 Apr 2020 19:02:22 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A2DD8A4055; Thu, 30 Apr 2020 19:02:22 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C6D62A4053; Thu, 30 Apr 2020 19:02:21 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.16.167]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 30 Apr 2020 19:02:21 +0000 (GMT) Subject: Re: [PATCH v1 1/1] fs/splice: add missing callback for inaccessible pages From: Christian Borntraeger To: Dave Hansen , Claudio Imbrenda , akpm@linux-foundation.org, jack@suse.cz, kirill@shutemov.name Cc: david@redhat.com, aarcange@redhat.com, linux-mm@kvack.org, frankja@linux.ibm.com, sfr@canb.auug.org.au, jhubbard@nvidia.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, peterz@infradead.org, sean.j.christopherson@intel.com, Ulrich Weigand References: <20200428225043.3091359-1-imbrenda@linux.ibm.com> <2a1abf38-d321-e3c7-c3b1-53b6db6da310@intel.com> Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.676 definitions=2020-04-30_12:2020-04-30,2020-04-30 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 adultscore=0 mlxlogscore=902 malwarescore=0 impostorscore=0 clxscore=1015 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004300144 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 30.04.20 20:12, Christian Borntraeger wrote: > > > On 29.04.20 18:07, Dave Hansen wrote: >> On 4/28/20 3:50 PM, Claudio Imbrenda wrote: >>> If a page is inaccesible and it is used for things like sendfile, then >>> the content of the page is not always touched, and can be passed >>> directly to a driver, causing issues. >>> >>> This patch fixes the issue by adding a call to arch_make_page_accessible >>> in page_cache_pipe_buf_confirm; this fixes the issue. >> >> I spent about 5 minutes putting together a patch: >> >> https://sr71.net/~dave/intel/accessible.patch > > You only set the page flag for compound pages. that of course leaves a big pile > of pages marked a not accessible, thus explaining the sendto trace and all kind > of other random traces. > > > What do you see when you also do the SetPageAccessible(page); > in the else page of prep_new_page (order == 0). > (I do get > 10000 of these non compound page allocs just during boot). > And yes, I think you are right that we should call the callback also for !FOLL_PIN.