From: "ying.huang@intel.com" <ying.huang@intel.com>
To: Miaohe Lin <linmiaohe@huawei.com>, akpm@linux-foundation.org
Cc: songmuchun@bytedance.com, hch@infradead.org, willy@infradead.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 2/9] mm/vmscan: remove unneeded can_split_huge_page check
Date: Tue, 12 Apr 2022 08:52:30 +0800 [thread overview]
Message-ID: <8a4a0426c81f13d70d2c82b7adbc957e3e953bf3.camel@intel.com> (raw)
In-Reply-To: <20220409093500.10329-3-linmiaohe@huawei.com>
On Sat, 2022-04-09 at 17:34 +0800, Miaohe Lin wrote:
> We don't need to check can_split_folio() because folio_maybe_dma_pinned()
> is checked before. It will avoid the long term pinned pages to be swapped
> out. And we can live with short term pinned pages. Without can_split_folio
> checking we can simplify the code. Also activate_locked can be changed to
> keep_locked as it's just short term pinning.
>
> Suggested-by: Huang, Ying <ying.huang@intel.com>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Look good to me. Thanks!
Reviewed-by: Huang, Ying <ying.huang@intel.com>
Best Regards,
Huang, Ying
> ---
> mm/vmscan.c | 22 ++++++++--------------
> 1 file changed, 8 insertions(+), 14 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 4a76be47bed1..01f5db75a507 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1711,20 +1711,14 @@ static unsigned int shrink_page_list(struct list_head *page_list,
> goto keep_locked;
> if (folio_maybe_dma_pinned(folio))
> goto keep_locked;
> - if (PageTransHuge(page)) {
> - /* cannot split THP, skip it */
> - if (!can_split_folio(folio, NULL))
> - goto activate_locked;
> - /*
> - * Split pages without a PMD map right
> - * away. Chances are some or all of the
> - * tail pages can be freed without IO.
> - */
> - if (!folio_entire_mapcount(folio) &&
> - split_folio_to_list(folio,
> - page_list))
> - goto activate_locked;
> - }
> + /*
> + * Split pages without a PMD map right
> + * away. Chances are some or all of the
> + * tail pages can be freed without IO.
> + */
> + if (PageTransHuge(page) && !folio_entire_mapcount(folio) &&
> + split_folio_to_list(folio, page_list))
> + goto keep_locked;
> if (!add_to_swap(page)) {
> if (!PageTransHuge(page))
> goto activate_locked_split;
next prev parent reply other threads:[~2022-04-12 0:52 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-09 9:34 [PATCH v2 0/9] A few cleanup and fixup patches for vmscan Miaohe Lin
2022-04-09 9:34 ` [PATCH v2 1/9] mm/vmscan: add a comment about MADV_FREE pages check in folio_check_dirty_writeback Miaohe Lin
2022-04-11 11:50 ` ying.huang
2022-04-12 3:07 ` Miaohe Lin
2022-04-11 14:16 ` Christoph Hellwig
2022-04-12 3:15 ` Miaohe Lin
2022-04-12 8:44 ` Oscar Salvador
2022-04-09 9:34 ` [PATCH v2 2/9] mm/vmscan: remove unneeded can_split_huge_page check Miaohe Lin
2022-04-11 14:18 ` Christoph Hellwig
2022-04-12 3:14 ` Miaohe Lin
2022-04-12 0:52 ` ying.huang [this message]
2022-04-12 8:59 ` Oscar Salvador
2022-04-12 13:42 ` Miaohe Lin
2022-04-12 14:59 ` David Hildenbrand
2022-04-13 1:26 ` ying.huang
2022-04-13 2:17 ` Miaohe Lin
2022-04-15 3:07 ` ying.huang
2022-04-16 2:34 ` Miaohe Lin
2022-04-09 9:34 ` [PATCH v2 3/9] mm/vmscan: introduce helper function reclaim_page_list() Miaohe Lin
2022-04-09 13:44 ` Matthew Wilcox
2022-04-11 1:53 ` Miaohe Lin
2022-04-11 3:17 ` Matthew Wilcox
2022-04-11 3:26 ` Miaohe Lin
2022-04-09 9:34 ` [PATCH v2 4/9] mm/vmscan: save a bit of stack space in shrink_lruvec Miaohe Lin
2022-04-12 0:57 ` ying.huang
2022-04-12 3:13 ` Miaohe Lin
2022-04-09 9:34 ` [PATCH v2 5/9] mm/vmscan: activate swap-backed executable folios after first usage Miaohe Lin
2022-04-12 0:59 ` ying.huang
2022-04-09 9:34 ` [PATCH v2 6/9] mm/vmscan: take all base pages of THP into account when race with speculative reference Miaohe Lin
2022-04-09 9:34 ` [PATCH v2 7/9] mm/vmscan: take min_slab_pages into account when try to call shrink_node Miaohe Lin
2022-04-12 1:36 ` ying.huang
2022-04-09 9:34 ` [PATCH v2 8/9] mm/vmscan: remove obsolete comment in kswapd_run Miaohe Lin
2022-04-09 9:35 ` [PATCH v2 9/9] mm/vmscan: use helper folio_is_file_lru() Miaohe Lin
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