linux-kernel - Re: [PATCH v7 2/2] mm/oom_kill: The OOM reaper traverses the VMA maple tree in reverse order

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Message-ID: <aLmENFH-g9MUQAsE@tiehlicka>
Date: Thu, 4 Sep 2025 14:21:08 +0200
From: Michal Hocko <mhocko@...e.com>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc: zhongjinji <zhongjinji@...or.com>, rientjes@...gle.com,
	shakeel.butt@...ux.dev, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, lorenzo.stoakes@...cle.com, surenb@...gle.com,
	liulu.liu@...or.com, feng.han@...or.com
Subject: Re: [PATCH v7 2/2] mm/oom_kill: The OOM reaper traverses the VMA
 maple tree in reverse order

On Wed 03-09-25 15:02:34, Liam R. Howlett wrote:
> * Michal Hocko <mhocko@...e.com> [250903 08:58]:
> > On Wed 03-09-25 17:27:29, zhongjinji wrote:
[...]
> mmu_notifier_release(mm) is called early in the exit_mmap() path should
> cause the mmu notifiers to be non-blocking (according to the comment in
> v6.0 source of exit_mmap [1].

I am not sure I follow you here. How does this relate to the actual
direction of the address space freeing?

> > > Signed-off-by: zhongjinji <zhongjinji@...or.com>
> > 
> > Anyway, the change on its own makes sense to me
> > Acked-by: Michal Hocko <mhocko@...e.com>
> > 
> > Thanks for working on the changelog improvements.
> 
> [1]. https://elixir.bootlin.com/linux/v6.0.19/source/mm/mmap.c#L3089
> 
> ...
> 
> Thanks,
> Liam

-- 
Michal Hocko
SUSE Labs