How about doing mark_page_accessed(page) in ra_nat_pages like
ra_sit_pages to prevent readahead pages are reclaimed by VM?
On 목, 2013-11-21 at 18:35 +0900, Jaegeuk Kim wrote:
> This patch changes the policy of submitting read bios at ra_nat_pages.
>
> Previously, f2fs submits small read bios with block plugging.
> But, with this patch, f2fs itself merges read bios first and then submits a
> large bio, which can reduce the bio handling overheads.
>
> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>
> ---
> fs/f2fs/node.c | 8 ++------
> 1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index b843a5b..c06871f 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -89,13 +89,10 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
> {
> struct address_space *mapping = sbi->meta_inode->i_mapping;
> struct f2fs_nm_info *nm_i = NM_I(sbi);
> - struct blk_plug plug;
> struct page *page;
> pgoff_t index;
> int i;
>
> - blk_start_plug(&plug);
> -
> for (i = 0; i < FREE_NID_PAGES; i++, nid += NAT_ENTRY_PER_BLOCK) {
> if (nid >= nm_i->max_nid)
> nid = 0;
> @@ -108,12 +105,11 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
mark_page_accessed(page);
> f2fs_put_page(page, 1);
> continue;
> }
> - if (f2fs_readpage(sbi, page, index, READ))
> - continue;
> + submit_read_page(sbi, page, index, READ_SYNC);
>
mark_page_accessed(page);
> f2fs_put_page(page, 0);
> }
> - blk_finish_plug(&plug);
> + f2fs_submit_read_bio(sbi, READ_SYNC);
> }
>
> static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)
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