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SubjectRe: [f2fs-dev] [PATCH 1/3] f2fs: use f2fs_submit_page_bio for ra_meta_pages
On 05/11, Chao Yu wrote:
> On 2017/5/11 9:24, Chao Yu wrote:
> > Hi Jaegeuk,
> >
> > On 2017/5/11 7:48, Jaegeuk Kim wrote:
> >> This patch avoids to use f2fs_submit_merged_bio for read, which was the only
> >> read case.
> >
> > This makes f2fs losing the chance to merge multiple pages into one bio during
> > reading continuous physical blocks, it may cause potential performance
> > regression, how about using a local bio in ra_meta_pages to cache more pages?
>
> BTW, need to remove sbi->read_io as well?

Yup.

>
> Thanks,
>
> >
> > Thanks,
> >
> >>
> >> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> >> ---
> >> fs/f2fs/checkpoint.c | 4 +---
> >> 1 file changed, 1 insertion(+), 3 deletions(-)
> >>
> >> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> >> index ea9c317b5916..8d92f8249000 100644
> >> --- a/fs/f2fs/checkpoint.c
> >> +++ b/fs/f2fs/checkpoint.c
> >> @@ -207,12 +207,10 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
> >> }
> >>
> >> fio.page = page;
> >> - fio.old_blkaddr = fio.new_blkaddr;
> >> - f2fs_submit_page_mbio(&fio);
> >> + f2fs_submit_page_bio(&fio);
> >> f2fs_put_page(page, 0);
> >> }
> >> out:
> >> - f2fs_submit_merged_bio(sbi, META, READ);
> >> blk_finish_plug(&plug);
> >> return blkno - start;
> >> }
> >>
> >
> >
> > .
> >

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