Hi,
2013-11-22 (금), 12:41 +0900, Changman Lee:
> How about doing mark_page_accessed(page) in ra_nat_pages like
> ra_sit_pages to prevent readahead pages are reclaimed by VM?
Agreed.
I'll modify and merge this.
Thanks,
>
> 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....@samsung.com>
> > ---
> > 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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--
Jaegeuk Kim
Samsung
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