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[67.231.145.42]) by mx.google.com with ESMTPS id cg6si1962713plb.350.2019.06.12.22.21.57 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 12 Jun 2019 22:21:57 -0700 (PDT) Received-SPF: pass (google.com: domain of prvs=1067aa1dbb=songliubraving@fb.com designates 67.231.145.42 as permitted sender) client-ip=67.231.145.42; Authentication-Results: mx.google.com; dkim=pass header.i=@fb.com header.s=facebook header.b=jN1MvnDh; spf=pass (google.com: domain of prvs=1067aa1dbb=songliubraving@fb.com designates 67.231.145.42 as permitted sender) smtp.mailfrom="prvs=1067aa1dbb=songliubraving@fb.com"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=fb.com Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x5D5KRMa024276 for ; Wed, 12 Jun 2019 22:21:56 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=facebook; bh=wVHeuJRR2IcBs441yrNKOyI6tpwJpCepFRIyVFLc+8w=; b=jN1MvnDhGz8W8WNzD0tKO8q3xPiiYrONNwwKuXt9DnXLXryMuRS3LEl8x6Wf//COtuPt 3sXq6VqKsaKyYf7ZITFbZRbEm9Ne50PrK8ojJXSVg8wK2rozSGgHLbXidmJ3fORHzE2w AwcW9tftJNGfFv/zWC2MfEWhRpMm71z1ZP8= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2t365k1x14-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT) for ; Wed, 12 Jun 2019 22:21:56 -0700 Received: from mx-out.facebook.com (2620:10d:c081:10::13) by mail.thefacebook.com (2620:10d:c081:35::128) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5; Wed, 12 Jun 2019 22:21:54 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 8EA5D62E2FC5; Wed, 12 Jun 2019 22:21:53 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Song Liu Smtp-Origin-Hostname: devbig006.ftw2.facebook.com To: CC: , , , , , , Song Liu Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH 0/3] Enable THP for text section of non-shmem files Date: Wed, 12 Jun 2019 22:21:48 -0700 Message-ID: <20190613052151.3782835-1-songliubraving@fb.com> X-Mailer: git-send-email 2.17.1 X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-13_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906130043 X-FB-Internal: deliver 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: This set follows up discussion at LSF/MM 2019. The motivation is to put text section of an application in THP, and thus reduces iTLB miss rate and improves performance. Both Facebook and Oracle showed strong interests to this feature. To make reviews easier, this set aims a mininal valid product. Current version of the work does not have any changes to file system specific code. This comes with some limitations (discussed later). This set enables an application to "hugify" its text section by simply running something like: madvise(0x600000, 0x80000, MADV_HUGEPAGE); Before this call, the /proc//maps looks like: 00400000-074d0000 r-xp 00000000 00:27 2006927 app After this call, part of the text section is splitted out and mapped to THP: 00400000-00425000 r-xp 00000000 00:27 2006927 app 00600000-00e00000 r-xp 00200000 00:27 2006927 app <<< on THP 00e00000-074d0000 r-xp 00a00000 00:27 2006927 app Limitations: 1. This only works for text section (vma with VM_DENYWRITE). 2. Once the application put its own pages in THP, the file is read only. open(file, O_WRITE) will fail with -ETXTBSY. To modify/update the file, it must be removed first. Here is an example case: root@virt-test:~/# ./app hugify ^C root@virt-test:~/# dd if=/dev/zero of=./app bs=1k count=2 dd: failed to open './app': Text file busy root@virt-test:~/# cp app.backup app cp: cannot create regular file 'app': Text file busy root@virt-test:~/# rm app root@virt-test:~/# cp app.backup app root@virt-test:~/# We gated this feature with an experimental config, READ_ONLY_THP_FOR_FS. Once we get better support on the write path, we can remove the config and enable it by default. Tested cases: 1. Tested with btrfs and ext4. 2. Tested with real work application (memcache like caching service). 3. Tested with "THP aware uprobe": https://patchwork.kernel.org/project/linux-mm/list/?series=131339 Please share your comments and suggestions on this. Thanks! Song Liu (3): mm: check compound_head(page)->mapping in filemap_fault() mm,thp: stats for file backed THP mm,thp: add read-only THP support for (non-shmem) FS fs/proc/meminfo.c | 4 ++ include/linux/fs.h | 8 +++ include/linux/mmzone.h | 2 + mm/Kconfig | 11 +++++ mm/filemap.c | 7 +-- mm/khugepaged.c | 107 +++++++++++++++++++++++++++++++++-------- mm/rmap.c | 12 +++-- mm/vmstat.c | 2 + 8 files changed, 125 insertions(+), 28 deletions(-) -- 2.17.1