From: Zheng Liu <wenqing.lz@xxxxxxxxxx>
io_stats file is created to show the result in sysfs.
Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx>
Signed-off-by: Wang Shaoyan <wangshaoyan.pt@xxxxxxxxxx>
---
fs/ext4/super.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 48 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 8e27b9c..bc1476d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2532,6 +2532,52 @@ static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
return count;
}
+static inline unsigned long ext4_get_ios_counter(int rw, int flag);
+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(READ, i);
+ ios_counters[i][WRITE] = ext4_get_ios_counter(WRITE, i);
+ }
+
+ return snprintf(buf, PAGE_SIZE,
+ "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",
+ 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 sbi_ui_show(struct ext4_attr *a,
struct ext4_sb_info *sbi, char *buf)
{
@@ -2575,6 +2621,7 @@ 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_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);
@@ -2601,6 +2648,7 @@ 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),
NULL,
};
--
1.7.4.1
--
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