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

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Message-ID: <YHCdjgaB8IjOMq4z@cmpxchg.org>
Date:   Fri, 9 Apr 2021 14:31:42 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     guro@...com, 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>

Good catch.

Acked-by: Johannes Weiner <hannes@...xchg.org>

Since this patch is somewhat independent of the rest of the series,
you may want to put it in the very beginning, or even submit it
separately, to keep the main series as compact as possible. Reviewers
can be more hesitant to get involved with larger series ;)