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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2014-04-30 09:22:45 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2014-05-07 10:21:58 +0900
commitd5f66990bb928e7490ba4da94d585f618adcee5e (patch)
tree41dd37a53c947a47d6ec4c0e2c648bd1268fae0b
parentbde446866c9200fcfa27ccde213d83db9a6827db (diff)
f2fs: decrease the lock granularity during write_begin
This patch reduces the lock granularity during write_begin. When the system is under memory pressure, it would be better to reduce the locking time for the data pages. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
-rw-r--r--fs/f2fs/data.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 91ff104b3849..a7bb98f5831a 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -909,6 +909,10 @@ 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 +924,18 @@ 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;