From: Zheng Liu <wenqing.lz@xxxxxxxxxx>
We create a io_stats file in sysfs to show the result. Meanwhile, io_stats_reset
is used to reset the s_ios_counters.
CC: Jens Axboe <axboe@xxxxxxxxx>
CC: Steven Whitehouse <swhiteho@xxxxxxxxxx>
CC: Aditya Kali <adityakali@xxxxxxxxxx>
Signed-off-by: Wang Shaoyan <wangshaoyan.pt@xxxxxxxxxx>
Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx>
---
fs/ext4/ext4.h | 2 +
fs/ext4/super.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 617be9f..35f4d02 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1107,6 +1107,8 @@ struct ext4_super_block {
#define EXT4_MF_MNTDIR_SAMPLED 0x0001
#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
+#define EXT4_IOS_VERSION "1.0"
+
/*
* ext4 io types
*/
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9f708ba..eb0f64f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2538,6 +2538,69 @@ static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
return count;
}
+static inline u64 ext4_get_ios_counter(struct ext4_sb_info *sbi,
+ int rw, int flag);
+static inline void ext4_reset_ios_counter(struct ext4_sb_info *sbi);
+static ssize_t io_stats_show(struct ext4_attr *a,
+ struct ext4_sb_info *sbi, char *buf)
+{
+ int i;
+ unsigned long ios_counters[EXT4_IOS_TYPE_END][2] = {{0,},};
+
+ for (i = 0; i < EXT4_IOS_TYPE_END; i++) {
+ ios_counters[i][READ] = ext4_get_ios_counter(sbi, READ, i);
+ ios_counters[i][WRITE] = ext4_get_ios_counter(sbi, WRITE, i);
+ }
+
+ return snprintf(buf, PAGE_SIZE,
+ "Version: %s\n"
+ "TYPE READ WRITE\n"
+ "super block %8lu %8lu\n"
+ "group descriptor %8lu %8lu\n"
+ "inode bitmap %8lu %8lu\n"
+ "block bitmap %8lu %8lu\n"
+ "inode table %8lu %8lu\n"
+ "extent block %8lu %8lu\n"
+ "indirect block %8lu %8lu\n"
+ "dir entry %8lu %8lu\n"
+ "extended attribute %8lu %8lu\n"
+ "regular data %8lu %8lu\n",
+ EXT4_IOS_VERSION,
+ ios_counters[EXT4_IOS_SUPER_BLOCK][READ],
+ ios_counters[EXT4_IOS_SUPER_BLOCK][WRITE],
+ ios_counters[EXT4_IOS_GROUP_DESC][READ],
+ ios_counters[EXT4_IOS_GROUP_DESC][WRITE],
+ ios_counters[EXT4_IOS_INODE_BITMAP][READ],
+ ios_counters[EXT4_IOS_INODE_BITMAP][WRITE],
+ ios_counters[EXT4_IOS_BLOCK_BITMAP][READ],
+ ios_counters[EXT4_IOS_BLOCK_BITMAP][WRITE],
+ ios_counters[EXT4_IOS_INODE_TABLE][READ],
+ ios_counters[EXT4_IOS_INODE_TABLE][WRITE],
+ ios_counters[EXT4_IOS_EXTENT_BLOCK][READ],
+ ios_counters[EXT4_IOS_EXTENT_BLOCK][WRITE],
+ ios_counters[EXT4_IOS_INDIRECT_BLOCK][READ],
+ ios_counters[EXT4_IOS_INDIRECT_BLOCK][WRITE],
+ ios_counters[EXT4_IOS_DIR_ENTRY][READ],
+ ios_counters[EXT4_IOS_DIR_ENTRY][WRITE],
+ ios_counters[EXT4_IOS_EXTENDED_ATTR][READ],
+ ios_counters[EXT4_IOS_EXTENDED_ATTR][WRITE],
+ ios_counters[EXT4_IOS_REGULAR_DATA][READ],
+ ios_counters[EXT4_IOS_REGULAR_DATA][WRITE]);
+}
+
+static ssize_t io_stats_reset_store(struct ext4_attr *a,
+ struct ext4_sb_info *sbi,
+ const char *buf, size_t count)
+{
+ unsigned long t;
+
+ if (parse_strtoul(buf, 0xffffffff, &t))
+ return -EINVAL;
+ if (t == 1)
+ ext4_reset_ios_counter(sbi);
+ return count;
+}
+
static ssize_t sbi_ui_show(struct ext4_attr *a,
struct ext4_sb_info *sbi, char *buf)
{
@@ -2571,6 +2634,7 @@ static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
+#define EXT4_WO_ATTR(name) EXT4_ATTR(name, 0222, NULL, name##_store)
#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
#define EXT4_RW_ATTR_SBI_UI(name, elname) \
EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
@@ -2581,6 +2645,8 @@ EXT4_RO_ATTR(session_write_kbytes);
EXT4_RO_ATTR(lifetime_write_kbytes);
EXT4_RO_ATTR(extent_cache_hits);
EXT4_RO_ATTR(extent_cache_misses);
+EXT4_RO_ATTR(io_stats);
+EXT4_WO_ATTR(io_stats_reset);
EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
inode_readahead_blks_store, s_inode_readahead_blks);
EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
@@ -2607,6 +2673,8 @@ static struct attribute *ext4_attrs[] = {
ATTR_LIST(mb_stream_req),
ATTR_LIST(mb_group_prealloc),
ATTR_LIST(max_writeback_mb_bump),
+ ATTR_LIST(io_stats),
+ ATTR_LIST(io_stats_reset),
NULL,
};
--
1.7.4.1
--
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