From: Andrew Morton <akpm@linux-foundation.org>
To: Altan Hacigumus <ahacigu.linux@gmail.com>
Cc: David Hildenbrand <david@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Kairui Song <kasong@tencent.com>, Qi Zheng <qi.zheng@linux.dev>,
Shakeel Butt <shakeel.butt@linux.dev>,
Barry Song <baohua@kernel.org>,
Axel Rasmussen <axelrasmussen@google.com>,
Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R . Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Jiayuan Chen <jiayuan.chen@shopee.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/vmscan: clear hopeless kswapd when global direct reclaim makes progress
Date: Fri, 10 Jul 2026 17:39:50 -0700 [thread overview]
Message-ID: <20260710173950.cc42b1b9c8d25fb02b29cf00@linux-foundation.org> (raw)
In-Reply-To: <CALjTKDkqCnT=AYS3VQPYE7SEqRHDHZvUt=8upRnRQDOpnjbfyA@mail.gmail.com>
On Thu, 9 Jul 2026 21:04:20 -0700 Altan Hacigumus <ahacigu.linux@gmail.com> wrote:
> > Does this change have any user-visible effect? If so, please describe
> > in elaborate detail.
> >
>
> Yes, the effect is visible on systems where a db workload mlocks 80%+
> of memory and the remaining memory is under continuous pressure:
> allocations stall long enough that ordinary tasks (e.g. ssh) become
> slow or unresponsive.
>
> > If not then that's OK - we make such changes all the time, but they're
> > less fun.
> >
> This was introduced by commit dc9fe9b7056a; for long before it, any
> reclaim progress revived kswapd. Now only a balanced node clears the
> hopeless state, which is too restrictive for global direct reclaim.
Great, thanks. Please get this info into the changelog and maintain it!
I'll park the patch for a week or so, give reviewers time to catch up.
next prev parent reply other threads:[~2026-07-11 0:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-10 2:44 [PATCH] mm/vmscan: clear hopeless kswapd when global direct reclaim makes progress Altan Hacigumus
2026-07-10 3:22 ` Andrew Morton
2026-07-10 4:04 ` Altan Hacigumus
2026-07-11 0:39 ` Andrew Morton [this message]
2026-07-14 11:34 ` Michal Hocko
2026-07-15 2:32 ` Altan Hacigumus
2026-07-15 7:12 ` Michal Hocko
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