linux-kernel - Re: [RFC PATCH v2 09/18] mm: vmscan: remove noinline_for

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Date:   Fri, 9 Apr 2021 17:49:16 -0700
From:   Roman Gushchin <guro@...com>
To:     Muchun Song <songmuchun@...edance.com>
CC:     <hannes@...xchg.org>, <mhocko@...nel.org>,
        <akpm@...ux-foundation.org>, <shakeelb@...gle.com>,
        <vdavydov.dev@...il.com>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, <duanxiongchun@...edance.com>,
        <fam.zheng@...edance.com>, <bsingharora@...il.com>,
        <shy828301@...il.com>, <alex.shi@...ux.alibaba.com>
Subject: Re: [RFC PATCH v2 09/18] mm: vmscan: remove noinline_for_stack

On Fri, Apr 09, 2021 at 08:29:50PM +0800, Muchun Song wrote:
> The noinline_for_stack is introduced by commit 666356297ec4 ("vmscan:
> set up pagevec as late as possible in shrink_inactive_list()"), its
> purpose is to delay the allocation of pagevec as late as possible to
> save stack memory. But the commit 2bcf88796381 ("mm: take pagevecs off
> reclaim stack") replace pagevecs by lists of pages_to_free. So we do
> not need noinline_for_stack, just remove it (let the compiler decide
> whether to inline).
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>

Acked-by: Roman Gushchin <guro@...com>

> ---
>  mm/vmscan.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 64bf07cc20f2..e40b21298d77 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2015,8 +2015,8 @@ static int too_many_isolated(struct pglist_data *pgdat, int file,
>   *
>   * Returns the number of pages moved to the given lruvec.
>   */
> -static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
> -						     struct list_head *list)
> +static unsigned int move_pages_to_lru(struct lruvec *lruvec,
> +				      struct list_head *list)
>  {
>  	int nr_pages, nr_moved = 0;
>  	LIST_HEAD(pages_to_free);
> @@ -2096,7 +2096,7 @@ static int current_may_throttle(void)
>   * shrink_inactive_list() is a helper for shrink_node().  It returns the number
>   * of reclaimed pages
>   */
> -static noinline_for_stack unsigned long
> +static unsigned long
>  shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
>  		     struct scan_control *sc, enum lru_list lru)
>  {
> -- 
> 2.11.0
>