[PATCH] f2fs: add app/fs io stat

From: Chao Yu
Date: Sat Jul 29 2017 - 06:43:37 EST

This patch enables inner app/fs io stats and introduces below virtual fs
nodes for exposing stats info:
/sys/fs/f2fs/<dev>/iostat_enable
/proc/fs/f2fs/<dev>/iostat_info

Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
fs/f2fs/checkpoint.c | 34 +++++++++++++++++++++---------
fs/f2fs/data.c | 35 +++++++++++++++++++++++--------
fs/f2fs/f2fs.h | 58 +++++++++++++++++++++++++++++++++++++++++++++++++---
fs/f2fs/file.c | 7 ++++++-
fs/f2fs/gc.c | 3 +++
fs/f2fs/inline.c | 1 +
fs/f2fs/node.c | 15 ++++++++------
fs/f2fs/segment.c | 19 +++++++++++++++--
fs/f2fs/super.c | 4 ++++
fs/f2fs/sysfs.c | 35 +++++++++++++++++++++++++++++++
10 files changed, 180 insertions(+), 31 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 3c84a2520796..da5b49183e09 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -230,8 +230,9 @@ void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
ra_meta_pages(sbi, index, BIO_MAX_PAGES, META_POR, true);
}

-static int f2fs_write_meta_page(struct page *page,
- struct writeback_control *wbc)
+static int __f2fs_write_meta_page(struct page *page,
+ struct writeback_control *wbc,
+ enum iostat_type io_type)
{
struct f2fs_sb_info *sbi = F2FS_P_SB(page);

@@ -244,7 +245,7 @@ static int f2fs_write_meta_page(struct page *page,
if (unlikely(f2fs_cp_error(sbi)))
goto redirty_out;

- write_meta_page(sbi, page);
+ write_meta_page(sbi, page, io_type);
dec_page_count(sbi, F2FS_DIRTY_META);

if (wbc->for_reclaim)
@@ -263,6 +264,12 @@ static int f2fs_write_meta_page(struct page *page,
return AOP_WRITEPAGE_ACTIVATE;
}

+static int f2fs_write_meta_page(struct page *page,
+ struct writeback_control *wbc)
+{
+ return __f2fs_write_meta_page(page, wbc, FS_META_IO);
+}
+
static int f2fs_write_meta_pages(struct address_space *mapping,
struct writeback_control *wbc)
{
@@ -283,7 +290,7 @@ static int f2fs_write_meta_pages(struct address_space *mapping,

trace_f2fs_writepages(mapping->host, wbc, META);
diff = nr_pages_to_write(sbi, META, wbc);
- written = sync_meta_pages(sbi, META, wbc->nr_to_write);
+ written = sync_meta_pages(sbi, META, wbc->nr_to_write, FS_META_IO);
mutex_unlock(&sbi->cp_mutex);
wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
return 0;
@@ -295,7 +302,7 @@ static int f2fs_write_meta_pages(struct address_space *mapping,
}

long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
- long nr_to_write)
+ long nr_to_write, enum iostat_type io_type)
{
struct address_space *mapping = META_MAPPING(sbi);
pgoff_t index = 0, end = ULONG_MAX, prev = ULONG_MAX;
@@ -346,7 +353,7 @@ long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
if (!clear_page_dirty_for_io(page))
goto continue_unlock;

- if (mapping->a_ops->writepage(page, &wbc)) {
+ if (__f2fs_write_meta_page(page, &wbc, io_type)) {
unlock_page(page);
break;
}
@@ -904,7 +911,14 @@ int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
if (inode) {
unsigned long cur_ino = inode->i_ino;

+ if (is_dir)
+ F2FS_I(inode)->cp_task = current;
+
filemap_fdatawrite(inode->i_mapping);
+
+ if (is_dir)
+ F2FS_I(inode)->cp_task = NULL;
+
iput(inode);
/* We need to give cpu to another writers. */
if (ino == cur_ino) {
@@ -1017,7 +1031,7 @@ static int block_operations(struct f2fs_sb_info *sbi)

if (get_pages(sbi, F2FS_DIRTY_NODES)) {
up_write(&sbi->node_write);
- err = sync_node_pages(sbi, &wbc, false);
+ err = sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO);
if (err) {
up_write(&sbi->node_change);
f2fs_unlock_all(sbi);
@@ -1115,7 +1129,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)

/* Flush all the NAT/SIT pages */
while (get_pages(sbi, F2FS_DIRTY_META)) {
- sync_meta_pages(sbi, META, LONG_MAX);
+ sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
if (unlikely(f2fs_cp_error(sbi)))
return -EIO;
}
@@ -1194,7 +1208,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)

/* Flush all the NAT BITS pages */
while (get_pages(sbi, F2FS_DIRTY_META)) {
- sync_meta_pages(sbi, META, LONG_MAX);
+ sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
if (unlikely(f2fs_cp_error(sbi)))
return -EIO;
}
@@ -1249,7 +1263,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
percpu_counter_set(&sbi->alloc_valid_block_count, 0);

/* Here, we only have one bio having CP pack */
- sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
+ sync_meta_pages(sbi, META_FLUSH, LONG_MAX, FS_CP_META_IO);

/* wait for previous submitted meta pages writeback */
wait_on_all_pages_writeback(sbi);
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index aefc2a5745d3..ee92f9d082b4 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1475,7 +1475,8 @@ int do_write_data_page(struct f2fs_io_info *fio)
}

static int __write_data_page(struct page *page, bool *submitted,
- struct writeback_control *wbc)
+ struct writeback_control *wbc,
+ enum iostat_type io_type)
{
struct inode *inode = page->mapping->host;
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
@@ -1496,6 +1497,7 @@ static int __write_data_page(struct page *page, bool *submitted,
.encrypted_page = NULL,
.submitted = false,
.need_lock = LOCK_RETRY,
+ .io_type = io_type,
};

trace_f2fs_writepage(page, DATA);
@@ -1602,7 +1604,7 @@ static int __write_data_page(struct page *page, bool *submitted,
static int f2fs_write_data_page(struct page *page,
struct writeback_control *wbc)
{
- return __write_data_page(page, NULL, wbc);
+ return __write_data_page(page, NULL, wbc, FS_DATA_IO);
}

/*
@@ -1611,7 +1613,8 @@ static int f2fs_write_data_page(struct page *page,
* warm/hot data page.
*/
static int f2fs_write_cache_pages(struct address_space *mapping,
- struct writeback_control *wbc)
+ struct writeback_control *wbc,
+ enum iostat_type io_type)
{
int ret = 0;
int done = 0;
@@ -1701,7 +1704,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
if (!clear_page_dirty_for_io(page))
goto continue_unlock;

- ret = __write_data_page(page, &submitted, wbc);
+ ret = __write_data_page(page, &submitted, wbc, io_type);
if (unlikely(ret)) {
/*
* keep nr_to_write, since vfs uses this to
@@ -1756,8 +1759,9 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
return ret;
}

-static int f2fs_write_data_pages(struct address_space *mapping,
- struct writeback_control *wbc)
+int __f2fs_write_data_pages(struct address_space *mapping,
+ struct writeback_control *wbc,
+ enum iostat_type io_type)
{
struct inode *inode = mapping->host;
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
@@ -1794,7 +1798,7 @@ static int f2fs_write_data_pages(struct address_space *mapping,
goto skip_write;

blk_start_plug(&plug);
- ret = f2fs_write_cache_pages(mapping, wbc);
+ ret = f2fs_write_cache_pages(mapping, wbc, io_type);
blk_finish_plug(&plug);

if (wbc->sync_mode == WB_SYNC_ALL)
@@ -1813,6 +1817,16 @@ static int f2fs_write_data_pages(struct address_space *mapping,
return 0;
}

+static int f2fs_write_data_pages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ struct inode *inode = mapping->host;
+
+ return __f2fs_write_data_pages(mapping, wbc,
+ F2FS_I(inode)->cp_task == current ?
+ FS_CP_DATA_IO : FS_DATA_IO);
+}
+
static void f2fs_write_failed(struct address_space *mapping, loff_t to)
{
struct inode *inode = mapping->host;
@@ -2079,10 +2093,13 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
up_read(&F2FS_I(inode)->dio_rwsem[rw]);

if (rw == WRITE) {
- if (err > 0)
+ if (err > 0) {
+ f2fs_record_iostat(F2FS_I_SB(inode), APP_DIRECT_IO,
+ err);
set_inode_flag(inode, FI_UPDATE_WRITE);
- else if (err < 0)
+ } else if (err < 0) {
f2fs_write_failed(mapping, offset + count);
+ }
}

trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 928028356fbc..385027897f4c 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -562,6 +562,7 @@ struct f2fs_inode_info {
f2fs_hash_t chash; /* hash value of given file name */
unsigned int clevel; /* maximum level of given file name */
struct task_struct *task; /* lookup and create consistency */
+ struct task_struct *cp_task; /* separate cp/wb IO stats*/
nid_t i_xattr_nid; /* node id that contains xattrs */
loff_t last_disk_size; /* lastly written file size */

@@ -868,6 +869,22 @@ enum need_lock_type {
LOCK_RETRY,
};

+enum iostat_type {
+ APP_DIRECT_IO, /* app direct IOs */
+ APP_BUFFERED_IO, /* app buffered IOs */
+ APP_WRITE_IO, /* app write IOs */
+ APP_MAPPED_IO, /* app mapped IOs */
+ FS_DATA_IO, /* data IOs from kworker/fsync/reclaimer */
+ FS_NODE_IO, /* node IOs from kworker/fsync/reclaimer */
+ FS_META_IO, /* meta IOs from kworker/reclaimer */
+ FS_GC_DATA_IO, /* data IOs from forground gc */
+ FS_GC_NODE_IO, /* node IOs from forground gc */
+ FS_CP_DATA_IO, /* data IOs from checkpoint */
+ FS_CP_NODE_IO, /* node IOs from checkpoint */
+ FS_CP_META_IO, /* meta IOs from checkpoint */
+ NR_IO_TYPE,
+};
+
struct f2fs_io_info {
struct f2fs_sb_info *sbi; /* f2fs_sb_info pointer */
enum page_type type; /* contains DATA/NODE/META/META_FLUSH */
@@ -882,6 +899,7 @@ struct f2fs_io_info {
bool submitted; /* indicate IO submission */
int need_lock; /* indicate we need to lock cp_rwsem */
bool in_list; /* indicate fio is in io_list */
+ enum iostat_type io_type; /* io type */
};

#define is_read_io(rw) ((rw) == READ)
@@ -1073,6 +1091,11 @@ struct f2fs_sb_info {
#endif
spinlock_t stat_lock; /* lock for stat operations */

+ /* For app/fs IO statistics */
+ spinlock_t iostat_lock;
+ unsigned long long write_iostat[NR_IO_TYPE];
+ bool iostat_enable;
+
/* For sysfs suppport */
struct kobject s_kobj;
struct completion s_kobj_unregister;
@@ -2302,6 +2325,31 @@ static inline int get_extra_isize(struct inode *inode)
sizeof((f2fs_inode)->field)) \
<= (F2FS_OLD_ATTRIBUTE_SIZE + extra_isize)) \

+static inline void f2fs_reset_iostat(struct f2fs_sb_info *sbi)
+{
+ int i;
+
+ spin_lock(&sbi->iostat_lock);
+ for (i = 0; i < NR_IO_TYPE; i++)
+ sbi->write_iostat[i] = 0;
+ spin_unlock(&sbi->iostat_lock);
+}
+
+static inline void f2fs_record_iostat(struct f2fs_sb_info *sbi,
+ enum iostat_type type, unsigned long long io_bytes)
+{
+ if (!sbi->iostat_enable)
+ return;
+ spin_lock(&sbi->iostat_lock);
+ sbi->write_iostat[type] += io_bytes;
+
+ if (type == APP_WRITE_IO || type == APP_DIRECT_IO)
+ sbi->write_iostat[APP_BUFFERED_IO] =
+ sbi->write_iostat[APP_WRITE_IO] -
+ sbi->write_iostat[APP_DIRECT_IO];
+ spin_unlock(&sbi->iostat_lock);
+}
+
/*
* file.c
*/
@@ -2428,7 +2476,7 @@ void move_node_page(struct page *node_page, int gc_type);
int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
struct writeback_control *wbc, bool atomic);
int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc,
- bool do_balance);
+ bool do_balance, enum iostat_type io_type);
void build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount);
bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid);
void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid);
@@ -2471,7 +2519,8 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range);
bool exist_trim_candidates(struct f2fs_sb_info *sbi, struct cp_control *cpc);
struct page *get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno);
void update_meta_page(struct f2fs_sb_info *sbi, void *src, block_t blk_addr);
-void write_meta_page(struct f2fs_sb_info *sbi, struct page *page);
+void write_meta_page(struct f2fs_sb_info *sbi, struct page *page,
+ enum iostat_type io_type);
void write_node_page(unsigned int nid, struct f2fs_io_info *fio);
void write_data_page(struct dnode_of_data *dn, struct f2fs_io_info *fio);
int rewrite_data_page(struct f2fs_io_info *fio);
@@ -2512,7 +2561,7 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
int type, bool sync);
void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index);
long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
- long nr_to_write);
+ long nr_to_write, enum iostat_type io_type);
void add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type);
void remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type);
void release_ino_entry(struct f2fs_sb_info *sbi, bool all);
@@ -2565,6 +2614,9 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 start, u64 len);
void f2fs_set_page_dirty_nobuffers(struct page *page);
+int __f2fs_write_data_pages(struct address_space *mapping,
+ struct writeback_control *wbc,
+ enum iostat_type io_type);
void f2fs_invalidate_page(struct page *page, unsigned int offset,
unsigned int length);
int f2fs_release_page(struct page *page, gfp_t wait);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 407518f42e45..d6cc12fea798 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -98,6 +98,8 @@ static int f2fs_vm_page_mkwrite(struct vm_fault *vmf)
if (!PageUptodate(page))
SetPageUptodate(page);

+ f2fs_record_iostat(sbi, APP_MAPPED_IO, F2FS_BLKSIZE);
+
trace_f2fs_vm_page_mkwrite(page, DATA);
mapped:
/* fill the page */
@@ -1815,7 +1817,7 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
f2fs_stop_checkpoint(sbi, false);
break;
case F2FS_GOING_DOWN_METAFLUSH:
- sync_meta_pages(sbi, META, LONG_MAX);
+ sync_meta_pages(sbi, META, LONG_MAX, FS_META_IO);
f2fs_stop_checkpoint(sbi, false);
break;
default:
@@ -2694,6 +2696,9 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
ret = __generic_file_write_iter(iocb, from);
blk_finish_plug(&plug);
clear_inode_flag(inode, FI_NO_PREALLOC);
+
+ if (ret > 0)
+ f2fs_record_iostat(F2FS_I_SB(inode), APP_WRITE_IO, ret);
}
inode_unlock(inode);

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 1c0117f60083..a75d26632794 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -688,6 +688,8 @@ static void move_encrypted_block(struct inode *inode, block_t bidx,
fio.new_blkaddr = newaddr;
f2fs_submit_page_write(&fio);

+ f2fs_record_iostat(fio.sbi, FS_GC_DATA_IO, F2FS_BLKSIZE);
+
f2fs_update_data_blkaddr(&dn, newaddr);
set_inode_flag(inode, FI_APPEND_WRITE);
if (page->index == 0)
@@ -735,6 +737,7 @@ static void move_data_page(struct inode *inode, block_t bidx, int gc_type,
.page = page,
.encrypted_page = NULL,
.need_lock = LOCK_REQ,
+ .io_type = FS_GC_DATA_IO,
};
bool is_dirty = PageDirty(page);
int err;
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index f38be791fdf9..e63ab0d1f614 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -117,6 +117,7 @@ int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
.op_flags = REQ_SYNC | REQ_PRIO,
.page = page,
.encrypted_page = NULL,
+ .io_type = FS_DATA_IO,
};
int dirty, err;

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 5483a735847f..b08f0d9bd86f 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1327,7 +1327,8 @@ static struct page *last_fsync_dnode(struct f2fs_sb_info *sbi, nid_t ino)
}

static int __write_node_page(struct page *page, bool atomic, bool *submitted,
- struct writeback_control *wbc, bool do_balance)
+ struct writeback_control *wbc, bool do_balance,
+ enum iostat_type io_type)
{
struct f2fs_sb_info *sbi = F2FS_P_SB(page);
nid_t nid;
@@ -1340,6 +1341,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
.page = page,
.encrypted_page = NULL,
.submitted = false,
+ .io_type = io_type,
};

trace_f2fs_writepage(page, NODE);
@@ -1408,7 +1410,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
static int f2fs_write_node_page(struct page *page,
struct writeback_control *wbc)
{
- return __write_node_page(page, false, NULL, wbc, false);
+ return __write_node_page(page, false, NULL, wbc, false, FS_NODE_IO);
}

int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
@@ -1496,7 +1498,8 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,

ret = __write_node_page(page, atomic &&
page == last_page,
- &submitted, wbc, true);
+ &submitted, wbc, true,
+ FS_NODE_IO);
if (ret) {
unlock_page(page);
f2fs_put_page(last_page, 0);
@@ -1534,7 +1537,7 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
}

int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc,
- bool do_balance)
+ bool do_balance, enum iostat_type io_type)
{
pgoff_t index, end;
struct pagevec pvec;
@@ -1613,7 +1616,7 @@ int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc,
set_dentry_mark(page, 0);

ret = __write_node_page(page, false, &submitted,
- wbc, do_balance);
+ wbc, do_balance, io_type);
if (ret)
unlock_page(page);
else if (submitted)
@@ -1702,7 +1705,7 @@ static int f2fs_write_node_pages(struct address_space *mapping,
diff = nr_pages_to_write(sbi, NODE, wbc);
wbc->sync_mode = WB_SYNC_NONE;
blk_start_plug(&plug);
- sync_node_pages(sbi, wbc, true);
+ sync_node_pages(sbi, wbc, true, FS_NODE_IO);
blk_finish_plug(&plug);
wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
return 0;
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 4a0bf3643e93..151968ecc694 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -292,6 +292,7 @@ static int __commit_inmem_pages(struct inode *inode,
.type = DATA,
.op = REQ_OP_WRITE,
.op_flags = REQ_SYNC | REQ_PRIO,
+ .io_type = FS_DATA_IO,
};
pgoff_t last_idx = ULONG_MAX;
int err = 0;
@@ -2255,7 +2256,8 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
}
}

-void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
+void write_meta_page(struct f2fs_sb_info *sbi, struct page *page,
+ enum iostat_type io_type)
{
struct f2fs_io_info fio = {
.sbi = sbi,
@@ -2274,6 +2276,8 @@ void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)

set_page_writeback(page);
f2fs_submit_page_write(&fio);
+
+ f2fs_record_iostat(sbi, io_type, F2FS_BLKSIZE);
}

void write_node_page(unsigned int nid, struct f2fs_io_info *fio)
@@ -2282,6 +2286,8 @@ void write_node_page(unsigned int nid, struct f2fs_io_info *fio)

set_summary(&sum, nid, 0, 0);
do_write_page(&sum, fio);
+
+ f2fs_record_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
}

void write_data_page(struct dnode_of_data *dn, struct f2fs_io_info *fio)
@@ -2295,13 +2301,22 @@ void write_data_page(struct dnode_of_data *dn, struct f2fs_io_info *fio)
set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
do_write_page(&sum, fio);
f2fs_update_data_blkaddr(dn, fio->new_blkaddr);
+
+ f2fs_record_iostat(sbi, fio->io_type, F2FS_BLKSIZE);
}

int rewrite_data_page(struct f2fs_io_info *fio)
{
+ int err;
+
fio->new_blkaddr = fio->old_blkaddr;
stat_inc_inplace_blocks(fio->sbi);
- return f2fs_submit_page_bio(fio);
+
+ err = f2fs_submit_page_bio(fio);
+
+ f2fs_record_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
+
+ return err;
}

void __f2fs_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 7a7cce908b80..166b97608f52 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2332,6 +2332,10 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
set_sbi_flag(sbi, SBI_POR_DOING);
spin_lock_init(&sbi->stat_lock);

+ /* init iostat info */
+ spin_lock_init(&sbi->iostat_lock);
+ sbi->iostat_enable = false;
+
for (i = 0; i < NR_PAGE_TYPE; i++) {
int n = (i == META) ? 1: NR_TEMP_TYPE;
int j;
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 1bc2cfb0b9df..29fd12200330 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -153,6 +153,10 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
return count;
}
*ui = t;
+
+ if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
+ f2fs_reset_iostat(sbi);
+
return count;
}

@@ -251,6 +255,7 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
#ifdef CONFIG_F2FS_FAULT_INJECTION
F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
@@ -290,6 +295,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(dirty_nats_ratio),
ATTR_LIST(cp_interval),
ATTR_LIST(idle_interval),
+ ATTR_LIST(iostat_enable),
#ifdef CONFIG_F2FS_FAULT_INJECTION
ATTR_LIST(inject_rate),
ATTR_LIST(inject_type),
@@ -393,6 +399,31 @@ static int segment_bits_seq_show(struct seq_file *seq, void *offset)
return 0;
}

+static int iostat_info_seq_show(struct seq_file *seq, void *offset)
+{
+ struct super_block *sb = seq->private;
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ time64_t now = ktime_get_real_seconds();
+ int i;
+
+ if (!sbi->iostat_enable)
+ return 0;
+
+ seq_puts(seq, "time(sec) app direct app buffered "
+ "app write app mapped "
+ "fs data fs node fs meta "
+ "fs gc data fs gc node "
+ "fs cp data fs cp node fs cp meta\n");
+
+ seq_printf(seq, "%-16llu", now);
+
+ for (i = 0; i < NR_IO_TYPE; i++)
+ seq_printf(seq, "%-16llu", sbi->write_iostat[i]);
+ seq_putc(seq, '\n');
+
+ return 0;
+}
+
#define F2FS_PROC_FILE_DEF(_name) \
static int _name##_open_fs(struct inode *inode, struct file *file) \
{ \
@@ -408,6 +439,7 @@ static const struct file_operations f2fs_seq_##_name##_fops = { \

F2FS_PROC_FILE_DEF(segment_info);
F2FS_PROC_FILE_DEF(segment_bits);
+F2FS_PROC_FILE_DEF(iostat_info);

int __init f2fs_init_sysfs(void)
{
@@ -456,6 +488,8 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
&f2fs_seq_segment_info_fops, sb);
proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
&f2fs_seq_segment_bits_fops, sb);
+ proc_create_data("iostat_info", S_IRUGO, sbi->s_proc,
+ &f2fs_seq_iostat_info_fops, sb);
}
return 0;
}
@@ -463,6 +497,7 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
{
if (sbi->s_proc) {
+ remove_proc_entry("iostat_info", sbi->s_proc);
remove_proc_entry("segment_info", sbi->s_proc);
remove_proc_entry("segment_bits", sbi->s_proc);
remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
--
2.13.1.388.g69e6b9b4f4a9