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Date: Mon, 13 Jul 2015 17:43:19 +0800 From: Chao Yu <chao2.yu@...sung.com> To: Jaegeuk Kim <jaegeuk@...nel.org> Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org Subject: [PATCH 2/4] 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@...sung.com> --- fs/f2fs/file.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 55e8e4b..f69bcd6 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -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); -- 2.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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