Re: [PATCH] mm/vmalloc: try alloc_pages_bulk first to get order 0 pages fast

[Mel Gorman]

On Fri, Jul 09, 2021 at 05:28:31PM +0800, Yang Huan wrote:
> Vmalloc may offen get pages by loop invoke alloc_pags, this is
> cost too much time in count watermark/cpuset or something.
> Let's just try alloc by alloc_pages_bulk, if failed, fullback in
> original path.
> 
> With my own test, simulate loop alloc_page and alloc_pages_bulk_array,
> get this:
> size		1M	10M	20M	30
> normal		44	1278	3665	5581
> test		34	889	2167	3300
> optimize	22%	30%	40%	40%
> And in my vmalloc top sort, zram/f2fs may alloc more than 20MB, so,
> It's worth to use alloc_pages_bulk.
> 
> Signed-off-by: Yang Huan <link@xxxxxxxx>

Thanks. I suggest you take a look at the current merge window and check
if anything additional needs to be done after the vmalloc bulk allocation
by Uladzislau Rezki.

-- 
Mel Gorman
SUSE Labs