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....@samsung.com> --- fs/f2fs/data.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 91ff104..a7bb98f 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; -- 1.8.4.474.g128a96c ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available. Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel