From: Sean Christopherson <seanjc@google.com>
To: Yosry Ahmed <yosryahmed@google.com>
Cc: Huacai Chen <chenhuacai@kernel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Anup Patel <anup@brainfault.org>,
Atish Patra <atishp@atishpatra.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
mizhang@google.com, David Matlack <dmatlack@google.com>,
kvm@vger.kernel.org, kvm-riscv@lists.infradead.org,
linux-mips@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Shakeel Butt <shakeelb@google.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v2 0/5] KVM: mm: count KVM page table pages in pagetable stats
Date: Tue, 5 Apr 2022 18:44:54 +0000 [thread overview]
Message-ID: <YkyOJqTeGRUjtuX1@google.com> (raw)
In-Reply-To: <20220404234154.1251388-1-yosryahmed@google.com>
On Mon, Apr 04, 2022, Yosry Ahmed wrote:
> We keep track of several kernel memory stats (total kernel memory, page
> tables, stack, vmalloc, etc) on multiple levels (global, per-node,
> per-memcg, etc). These stats give insights to users to how much memory
> is used by the kernel and for what purposes.
>
> Currently, memory used by kvm for its page tables is not accounted in
> the pagetable stats. This patch series accounts the memory pages used by
> KVM for page tables in those stats.
It's still not obvious to me that piggybacking NR_PAGETABLE is desirable, probably
because I am quite clueless as to how these stats are used on the backend. E.g.
why not have a NR_SECONDARY_PAGETABLE entry to track pages used for secondary MMU
page tables?
next prev parent reply other threads:[~2022-04-05 18:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-04 23:41 Yosry Ahmed
2022-04-04 23:41 ` [PATCH v2 1/5] KVM: mm: add a helper to account page table pages used by KVM Yosry Ahmed
2022-04-04 23:41 ` [PATCH v2 2/5] KVM: x86: mm: count KVM page table pages in pagetable stats Yosry Ahmed
2022-04-04 23:41 ` [PATCH v2 3/5] KVM: arm64: " Yosry Ahmed
2022-04-04 23:41 ` [PATCH v2 4/5] KVM: riscv: " Yosry Ahmed
2022-04-04 23:41 ` [PATCH v2 5/5] KVM: mips: " Yosry Ahmed
2022-04-05 18:44 ` Sean Christopherson [this message]
2022-04-05 18:50 ` [PATCH v2 0/5] KVM: " Yosry Ahmed
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