linux-kernel - Re: [PATCH 0/2] KVM: x86/mmu: Repurpose MMU shrinker into page cache shrinker

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Message-ID: <ZvSiCYZv5Gban0VW@google.com>
Date: Wed, 25 Sep 2024 16:51:37 -0700
From: David Matlack <dmatlack@...gle.com>
To: Vipin Sharma <vipinsh@...gle.com>
Cc: seanjc@...gle.com, pbonzini@...hat.com, zhi.wang.linux@...il.com,
	weijiang.yang@...el.com, mizhang@...gle.com,
	liangchen.linux@...il.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] KVM: x86/mmu: Repurpose MMU shrinker into page cache
 shrinker

On 2024-09-13 02:43 PM, Vipin Sharma wrote:
> This series is extracted out from the NUMA aware page table series[1].
> MMU shrinker changes were in patches 1 to 9 in the old series.

I'm curious how you tested this series. Would it be posisble to write a
selftest to exercise KVM's shrinker interactions? I don't think it needs
to be anything fancy to be useful (e.g. just run a VM, trigger lots of
shrinking, and make sure nothing blows up).

There appears to be a debugfs interface which could be used to trigger
shrinking from a selftest.

https://docs.kernel.org/admin-guide/mm/shrinker_debugfs.html