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Message-Id: <20240925022914.7c4033c9bb1206ad149ba69e@linux-foundation.org>
Date: Wed, 25 Sep 2024 02:29:14 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: liuye <liuye@...inos.cn>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/vmscan: Fix hard LOCKUP in function
isolate_lru_folios
On Wed, 25 Sep 2024 16:37:14 +0800 liuye <liuye@...inos.cn> wrote:
>
>
> On 2024/9/25 上午8:22, Andrew Morton wrote:
> > On Wed, 14 Aug 2024 17:18:25 +0800 liuye <liuye@...inos.cn> wrote:
> >
> >> @@ -1669,10 +1670,12 @@ static unsigned long isolate_lru_folios(unsigned long nr_to_scan,
> >> nr_pages = folio_nr_pages(folio);
> >> total_scan += nr_pages;
> >>
> >> - if (folio_zonenum(folio) > sc->reclaim_idx ||
> >> - skip_cma(folio, sc)) {
> >> + /* Using max_nr_skipped to prevent hard LOCKUP*/
> >> + if ((max_nr_skipped < SWAP_CLUSTER_MAX_SKIPPED) &&
> >> + (folio_zonenum(folio) > sc->reclaim_idx || skip_cma(folio, sc))) {
> >> nr_skipped[folio_zonenum(folio)] += nr_pages;
> >> move_to = &folios_skipped;
> >> + max_nr_skipped++;
> >> goto move;
> >
> > This hunk is not applicable to current mainline.
> >
>
> Please see the PATCH v2 in link [1], and the related discussion in link [2].
> Then please explain why it is not applicable,thank you.
What I mean is that the patch doesn't apply.
Current mainline has
if (folio_zonenum(folio) > sc->reclaim_idx) {
nr_skipped[folio_zonenum(folio)] += nr_pages;
move_to = &folios_skipped;
goto move;
}
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