f2fs: add a tracepoint for f2fs_write_{meta,node,data}_page

[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / fs / f2fs / data.c

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 91ff104b38492b97448f2f8d98f53e62adffbd7c..b997d552880ea97a9517994cf8207b50c13deb4e 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -788,6 +788,8 @@ static int f2fs_write_data_page(struct page *page,
                .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
        };
 
+       trace_f2fs_writepage(page, DATA);
+
        if (page->index < end_index)
                goto write;
 
@@ -900,6 +902,8 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
        struct dnode_of_data dn;
        int err = 0;
 
+       trace_f2fs_write_begin(inode, pos, len, flags);
+
        f2fs_balance_fs(sbi);
 repeat:
        err = f2fs_convert_inline_data(inode, pos + len);
@@ -909,6 +913,10 @@ repeat:
        page = grab_cache_page_write_begin(mapping, index, flags);
        if (!page)
                return -ENOMEM;
+
+       /* to avoid latency during memory pressure */
+       unlock_page(page);
+
        *pagep = page;
 
        if (f2fs_has_inline_data(inode) && (pos + len) <= MAX_INLINE_DATA)
@@ -920,10 +928,18 @@ repeat:
        f2fs_unlock_op(sbi);
 
        if (err) {
-               f2fs_put_page(page, 1);
+               f2fs_put_page(page, 0);
                return err;
        }
 inline_data:
+       lock_page(page);
+       if (unlikely(page->mapping != mapping)) {
+               f2fs_put_page(page, 1);
+               goto repeat;
+       }
+
+       f2fs_wait_on_page_writeback(page, DATA);
+
        if ((len == PAGE_CACHE_SIZE) || PageUptodate(page))
                return 0;
 
@@ -975,6 +991,8 @@ static int f2fs_write_end(struct file *file,
 {
        struct inode *inode = page->mapping->host;
 
+       trace_f2fs_write_end(inode, pos, len, copied);
+
        SetPageUptodate(page);
        set_page_dirty(page);