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(unknown [120.245.2.88]) by mr85p00im-zteg06011501.me.com (Postfix) with ESMTPSA id C8C51480823; Wed, 12 Jan 2022 14:36:42 +0000 (UTC) From: sxwjean@me.com To: akpm@linux-foundation.org, david@redhat.com, mhocko@suse.com, dan.j.williams@intel.com, osalvador@suse.de, naoya.horiguchi@nec.com, thunder.leizhen@huawei.com Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Xiongwei Song Subject: [PATCH v3 2/2] proc: Add getting pages info of ZONE_DEVICE support Date: Wed, 12 Jan 2022 22:35:17 +0800 Message-Id: <20220112143517.262143-3-sxwjean@me.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220112143517.262143-1-sxwjean@me.com> References: <20220112143517.262143-1-sxwjean@me.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: =?UTF-8?Q?vendor=3Dfsecure_engine=3D1.1.170-22c6f66c430a71ce266a39bfe25bc?= =?UTF-8?Q?2903e8d5c8f:6.0.425,18.0.790,17.0.607.475.0000000_definitions?= =?UTF-8?Q?=3D2022-01-12=5F04:2022-01-11=5F01,2022-01-12=5F04,2020-04-07?= =?UTF-8?Q?=5F01_signatures=3D0?= X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=922 bulkscore=0 malwarescore=0 mlxscore=0 adultscore=0 clxscore=1015 suspectscore=0 phishscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2201120095 X-Rspamd-Queue-Id: 38F7520017 X-Stat-Signature: ds1mazdzzkit8rsfqjmsog9j3ukc1n54 Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=me.com header.s=1a1hai header.b=wrc8VTVY; dmarc=pass (policy=quarantine) header.from=me.com; spf=pass (imf03.hostedemail.com: domain of sxwjean@me.com designates 17.58.23.182 as permitted sender) smtp.mailfrom=sxwjean@me.com X-Rspamd-Server: rspam03 X-HE-Tag: 1641998217-924761 Content-Transfer-Encoding: quoted-printable 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: From: Xiongwei Song When requesting pages info by /proc/kpage*, the pages in ZONE_DEVICE were ignored. The pfn_to_devmap_page() function can help to get page that belongs to ZONE_DEVICE. Signed-off-by: Xiongwei Song --- V3: Reset pgmap to NULL after putting dev_pagemap to prevent false non-NU= LL. --- fs/proc/page.c | 41 ++++++++++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 13 deletions(-) diff --git a/fs/proc/page.c b/fs/proc/page.c index 9f1077d94cde..d4fc308765f5 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -15,6 +15,7 @@ #include #include #include +#include #include "internal.h" =20 #define KPMSIZE sizeof(u64) @@ -46,6 +47,7 @@ static ssize_t kpagecount_read(struct file *file, char = __user *buf, { const unsigned long max_dump_pfn =3D get_max_dump_pfn(); u64 __user *out =3D (u64 __user *)buf; + struct dev_pagemap *pgmap =3D NULL; struct page *ppage; unsigned long src =3D *ppos; unsigned long pfn; @@ -60,17 +62,20 @@ static ssize_t kpagecount_read(struct file *file, cha= r __user *buf, count =3D min_t(unsigned long, count, (max_dump_pfn * KPMSIZE) - src); =20 while (count > 0) { - /* - * TODO: ZONE_DEVICE support requires to identify - * memmaps that were actually initialized. - */ ppage =3D pfn_to_online_page(pfn); + if (!ppage) + ppage =3D pfn_to_devmap_page(pfn, &pgmap); =20 if (!ppage || PageSlab(ppage) || page_has_type(ppage)) pcount =3D 0; else pcount =3D page_mapcount(ppage); =20 + if (pgmap) { + put_dev_pagemap(pgmap); + pgmap =3D NULL; + } + if (put_user(pcount, out)) { ret =3D -EFAULT; break; @@ -229,10 +234,12 @@ static ssize_t kpageflags_read(struct file *file, c= har __user *buf, { const unsigned long max_dump_pfn =3D get_max_dump_pfn(); u64 __user *out =3D (u64 __user *)buf; + struct dev_pagemap *pgmap =3D NULL; struct page *ppage; unsigned long src =3D *ppos; unsigned long pfn; ssize_t ret =3D 0; + u64 flags; =20 pfn =3D src / KPMSIZE; if (src & KPMMASK || count & KPMMASK) @@ -242,13 +249,17 @@ static ssize_t kpageflags_read(struct file *file, c= har __user *buf, count =3D min_t(unsigned long, count, (max_dump_pfn * KPMSIZE) - src); =20 while (count > 0) { - /* - * TODO: ZONE_DEVICE support requires to identify - * memmaps that were actually initialized. - */ ppage =3D pfn_to_online_page(pfn); + if (!ppage) + ppage =3D pfn_to_devmap_page(pfn, &pgmap); + + flags =3D stable_page_flags(ppage); + if (pgmap) { + put_dev_pagemap(pgmap); + pgmap =3D NULL; + } =20 - if (put_user(stable_page_flags(ppage), out)) { + if (put_user(flags, out)) { ret =3D -EFAULT; break; } @@ -277,6 +288,7 @@ static ssize_t kpagecgroup_read(struct file *file, ch= ar __user *buf, { const unsigned long max_dump_pfn =3D get_max_dump_pfn(); u64 __user *out =3D (u64 __user *)buf; + struct dev_pagemap *pgmap =3D NULL; struct page *ppage; unsigned long src =3D *ppos; unsigned long pfn; @@ -291,17 +303,20 @@ static ssize_t kpagecgroup_read(struct file *file, = char __user *buf, count =3D min_t(unsigned long, count, (max_dump_pfn * KPMSIZE) - src); =20 while (count > 0) { - /* - * TODO: ZONE_DEVICE support requires to identify - * memmaps that were actually initialized. - */ ppage =3D pfn_to_online_page(pfn); + if (!ppage) + ppage =3D pfn_to_devmap_page(pfn, &pgmap); =20 if (ppage) ino =3D page_cgroup_ino(ppage); else ino =3D 0; =20 + if (pgmap) { + put_dev_pagemap(pgmap); + pgmap =3D NULL; + } + if (put_user(ino, out)) { ret =3D -EFAULT; break; --=20 2.30.2