On Mon, Nov 30, 2020 at 03:28:51PM +0800, chenlei0x@xxxxxxxxx wrote: > From: Lei Chen <lennychen@xxxxxxxxxxx> > > iomap_add_to_ioend append page on wpc->ioend->io_bio. If io_bio is full, > iomap_chain_bio will allocate a new bio. So when bio_add_page is called, > pages is guaranteed to be appended into wpc->ioend->io_bio. So we do not > need to check if page can be merged. Thus it's a faster way to directly > call __bio_add_page. How much faster? --D > Signed-off-by: Lei Chen <lennychen@xxxxxxxxxxx> > --- > fs/iomap/buffered-io.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c > index 10cc797..7a0631a 100644 > --- a/fs/iomap/buffered-io.c > +++ b/fs/iomap/buffered-io.c > @@ -1310,7 +1310,7 @@ static void iomap_writepage_end_bio(struct bio *bio) > wpc->ioend->io_bio = > iomap_chain_bio(wpc->ioend->io_bio); > } > - bio_add_page(wpc->ioend->io_bio, page, len, poff); > + __bio_add_page(wpc->ioend->io_bio, page, len, poff); > } > > wpc->ioend->io_size += len; > -- > 1.8.3.1 >
