Commit 5b339124 authored Jul 13, 2015 by Chao Yu Committed by Jaegeuk Kim Aug 04, 2015

f2fs: warm up cold page after mmaped write



With cost-benifit method, background gc will consider old section with
fewer valid blocks as candidate victim, these old blocks in section will
be treated as cold data, and laterly will be moved into cold segment.

But if the gcing page is attached by user through buffered or mmaped
write, we should reset the page as non-cold one, because this page may
have more opportunity for further updating.

So fix to add clearing code for the missed 'mmap' case.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent c1c1b583

fs/f2fs/file.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -86,6 +86,8 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
		mapped:
		/* fill the page */
		f2fs_wait_on_page_writeback(page, DATA);
		/* if gced page is attached, don't write to cold segment */
		clear_cold_data(page);
		out:
		sb_end_pagefault(inode->i_sb);
		return block_page_mkwrite_return(err);

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