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f2fs: add app/fs io stat

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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@huawei.com>
[Jaegeuk Kim: fix wrong stat assignment]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2017-08-02 23:21:48 +08:00
committed by Jaegeuk Kim
parent 35ee82ca13
commit b0af6d491a
10 changed files with 200 additions and 31 deletions
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35
fs/f2fs/data.c
View File

@@ -1475,7 +1475,8 @@ out:
}
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 @@ redirty_out:
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 @@ continue_unlock:
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 @@ continue_unlock:
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 @@ skip_write:
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_update_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);