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Mon, 02 May 2022 10:48:24 +0100 Date: Mon, 02 May 2022 10:49:05 +0100 Message-ID: <87k0b4i7se.wl-maz@kernel.org> From: Marc Zyngier To: Oliver Upton Cc: Yosry Ahmed , Tejun Heo , Johannes Weiner , Zefan Li , James Morse , Alexandru Elisei , Suzuki K Poulose , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Andrew Morton , Michal Hocko , Roman Gushchin , Shakeel Butt , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v4 4/4] KVM: arm64/mmu: count KVM s2 mmu usage in secondary pagetable stats In-Reply-To: References: <20220429201131.3397875-1-yosryahmed@google.com> <20220429201131.3397875-5-yosryahmed@google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: oupton@google.com, yosryahmed@google.com, tj@kernel.org, hannes@cmpxchg.org, lizefan.x@bytedance.com, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, akpm@linux-foundation.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeelb@google.com, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-mm@kvack.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=dBpvmz6s; spf=pass (imf04.hostedemail.com: domain of maz@kernel.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=maz@kernel.org; dmarc=pass (policy=none) header.from=kernel.org X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 22C0540079 X-Stat-Signature: 9397cskxrnu8oj3yiemdkkw4acykrgmk X-HE-Tag: 1651484903-863855 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 02 May 2022 08:24:28 +0100, Oliver Upton wrote: > > Hi Yosry, > > On Fri, Apr 29, 2022 at 08:11:31PM +0000, Yosry Ahmed wrote: > > Count the pages used by KVM in arm64 for stage2 mmu in secondary pagetable > > stats. > > > > Signed-off-by: Yosry Ahmed > > --- > > arch/arm64/kvm/mmu.c | 35 +++++++++++++++++++++++++++++++---- > > 1 file changed, 31 insertions(+), 4 deletions(-) > > > > diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c > > index 53ae2c0640bc..fc5030307cce 100644 > > --- a/arch/arm64/kvm/mmu.c > > +++ b/arch/arm64/kvm/mmu.c > > @@ -92,9 +92,13 @@ static bool kvm_is_device_pfn(unsigned long pfn) > > static void *stage2_memcache_zalloc_page(void *arg) > > { > > struct kvm_mmu_memory_cache *mc = arg; > > + void *virt; > > > > /* Allocated with __GFP_ZERO, so no need to zero */ > > - return kvm_mmu_memory_cache_alloc(mc); > > + virt = kvm_mmu_memory_cache_alloc(mc); > > + if (virt) > > + kvm_account_pgtable_pages(virt, +1); > > Sorry I didn't say it last time around, would now be a good time to > clean up the funky sign convention of kvm_mod_used_mmu_pages()? Or limit > the funk to just x86 :) Indeed. I pointed this out in my initial review of this series, and expected these to be gone by now. M. -- Without deviation from the norm, progress is not possible.