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From: "ying.huang@intel.com" <ying.huang@intel.com>
To: Miaohe Lin <linmiaohe@huawei.com>,
	akpm@linux-foundation.org, Christoph Hellwig <hch@infradead.org>
Cc: songmuchun@bytedance.com, hch@infradead.org, willy@infradead.org,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH v2 7/9] mm/vmscan: take min_slab_pages into account when try to call shrink_node
Date: Tue, 12 Apr 2022 09:36:31 +0800	[thread overview]
Message-ID: <d628e99c1e3b1786a84e6e7a449c1b662c19b7aa.camel@intel.com> (raw)
In-Reply-To: <20220409093500.10329-8-linmiaohe@huawei.com>

On Sat, 2022-04-09 at 17:34 +0800, Miaohe Lin wrote:
> Since commit 6b4f7799c6a5 ("mm: vmscan: invoke slab shrinkers from
> shrink_zone()"), slab reclaim and lru page reclaim are done together
> in the shrink_node. So we should take min_slab_pages into account
> when try to call shrink_node.
> 

Looks reasonable to me, copying Johannes.

Hi, Christoph,

Should we check min_unmapped_pages and min_slab_pages in shrink_node()
to avoid reclaim LRU when necessary and vice versa?  This may be done
via another 2 scan_control flags.

Best Regards,
Huang, Ying

> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
>  mm/vmscan.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 53f1d0755b34..ba83d8f3e53e 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -4714,7 +4714,8 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
>  	noreclaim_flag = memalloc_noreclaim_save();
>  	set_task_reclaim_state(p, &sc.reclaim_state);
>  
> 
> 
> 
> -	if (node_pagecache_reclaimable(pgdat) > pgdat->min_unmapped_pages) {
> +	if (node_pagecache_reclaimable(pgdat) > pgdat->min_unmapped_pages ||
> +	    node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B) > pgdat->min_slab_pages) {
>  		/*
>  		 * Free memory by calling shrink node with increasing
>  		 * priorities until we have enough memory freed.



  reply	other threads:[~2022-04-12  1:36 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
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 [this message]
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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