linux-kernel - [PATCH v1 1/3] tools/vm/page-types.c: make walk

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Date:   Mon,  4 Oct 2021 15:13:23 +0900
From:   Naoya Horiguchi <naoya.horiguchi@...ux.dev>
To:     linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Christian Hansen <chansen3@...co.com>,
        Changbin Du <changbin.du@...el.com>,
        Bin Wang <wangbin224@...wei.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/3] tools/vm/page-types.c: make walk_file() aware of address range option

From: Naoya Horiguchi <naoya.horiguchi@....com>

-a|--addr option is used to limit the range of address to be
scanned for page status. It works now for physical address space
(dafult mode) or for virtual address space (with -p option), but
not for file address space (with -f option).  So make walk_file()
aware of -a option.

Signed-off-by: Naoya Horiguchi <naoya.horiguchi@....com>
---
 tools/vm/page-types.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git v5.15-rc3/tools/vm/page-types.c v5.15-rc3_patched/tools/vm/page-types.c
index f62f10c988db..b14376af1f16 100644
--- v5.15-rc3/tools/vm/page-types.c
+++ v5.15-rc3_patched/tools/vm/page-types.c
@@ -967,22 +967,19 @@ static struct sigaction sigbus_action = {
 	.sa_flags = SA_SIGINFO,
 };
 
-static void walk_file(const char *name, const struct stat *st)
+static void walk_file_range(const char *name, int fd,
+			    unsigned long off, unsigned long end)
 {
 	uint8_t vec[PAGEMAP_BATCH];
 	uint64_t buf[PAGEMAP_BATCH], flags;
 	uint64_t cgroup = 0;
 	uint64_t mapcnt = 0;
 	unsigned long nr_pages, pfn, i;
-	off_t off, end = st->st_size;
-	int fd;
 	ssize_t len;
 	void *ptr;
 	int first = 1;
 
-	fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW);
-
-	for (off = 0; off < end; off += len) {
+	for (; off < end; off += len) {
 		nr_pages = (end - off + page_size - 1) / page_size;
 		if (nr_pages > PAGEMAP_BATCH)
 			nr_pages = PAGEMAP_BATCH;
@@ -1043,6 +1040,21 @@ static void walk_file(const char *name, const struct stat *st)
 				 flags, cgroup, mapcnt, buf[i]);
 		}
 	}
+}
+
+static void walk_file(const char *name, const struct stat *st)
+{
+	int i;
+	int fd;
+
+	fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW);
+
+	if (!nr_addr_ranges)
+		add_addr_range(0, st->st_size / page_size);
+
+	for (i = 0; i < nr_addr_ranges; i++)
+		walk_file_range(name, fd, opt_offset[i] * page_size,
+				(opt_offset[i] + opt_size[i]) * page_size);
 
 	close(fd);
 }
-- 
2.25.1