Re: [PATCH v2] mm/swap: Add cond_resched() in swap_reclaim_full_clusters to prevent softlockup

[Baoquan He <baoquan.he@linux.dev>]

On 05/08/26 at 07:33pm, Zijiang Huang wrote:
> >On Wed, May 6, 2026 at 4:56=E2=80=AFPM Zijiang Huang <huangzjsmile@gmail.co=
> >m> wrote:
> >>
> >> We hit a real softlockup in an internal stress test environment.
> >> The workload was LTP memory/swap stress on a large arm64 machine,
> >> with 320 CPUs, about 1TB memory and an 8.6GB swap device.
> >> The system was under heavy load and the swap device had a large
> >> number of full clusters. The softlockup was triggered during
> >> a stress test after about 3 days.
> >>
> >> So, add periodic cond_resched() calls during large full_clusters
> >> reclaim operations to prevent softlockup issues.
> >Thank you for reporting and fixing this issue.
> > 
> >Can you add that to the patch commit log? This background information
> >is very important for the reader why this change is needed.
> > 
> >Assume you will update the commit log. 
> > 
> >Acked-by: Chris Li <chrisl@kernel.org>
> > 
> >Chris
> 
> Hi Chris, I've updated the commit log with the background information in v2. Thanks!

From my mail client, I see your v2 is in the same thread as v1. People
may mistaken it as a discussion reply. It's better to post v2
separately. You can resend v2 with reviewers' ack tag collected.