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Thu, 2 Sep 2021 18:11:51 +0000 (UTC) Received: from sofa.misterjones.org ([185.219.108.64] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mLrBl-008h0e-4X; Thu, 02 Sep 2021 19:11:49 +0100 Date: Thu, 02 Sep 2021 19:11:48 +0100 Message-ID: <875yvix2xn.wl-maz@kernel.org> From: Marc Zyngier To: Jia He Subject: Re: [PATCH 2/2] KVM: arm64: Add memcg accounting to KVM allocations In-Reply-To: <20210902002801.32618-2-justin.he@arm.com> References: <20210902002801.32618-1-justin.he@arm.com> <20210902002801.32618-2-justin.he@arm.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") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: justin.he@arm.com, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, catalin.marinas@arm.com, will@kernel.org, liushixin2@huawei.com, eric.auger@redhat.com, keescook@chromium.org, ndesaulniers@google.com, lushenming@huawei.com, samitolvanen@google.com, lorenzo.pieralisi@arm.com, nixiaoming@huawei.com, yuzenghui@huawei.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: Xiaoming Ni , Shenming Lu , Kees Cook , Will Deacon , Catalin Marinas , Nick Desaulniers , linux-kernel@vger.kernel.org, Liu Shixin , Lorenzo Pieralisi , Sami Tolvanen , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Thu, 02 Sep 2021 01:28:01 +0100, Jia He wrote: > > Inspired by commit 254272ce6505 ("kvm: x86: Add memcg accounting to KVM > allocations"), it would be better to make arm64 KVM consistent with > common kvm codes. > > The memory allocations of VM scope should be charged into VM process > cgroup, hence change GFP_KERNEL to GFP_KERNEL_ACCOUNT. > > There remained a few cases since these allocations are global, not in VM > scope. > > Signed-off-by: Jia He > --- > arch/arm64/kvm/arm.c | 6 ++++-- > arch/arm64/kvm/mmu.c | 2 +- > arch/arm64/kvm/pmu-emul.c | 2 +- > arch/arm64/kvm/reset.c | 2 +- > 4 files changed, 7 insertions(+), 5 deletions(-) > > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c > index e9a2b8f27792..9d6f5bcaddef 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -289,10 +289,12 @@ long kvm_arch_dev_ioctl(struct file *filp, > > struct kvm *kvm_arch_alloc_vm(void) > { > + unsigned long sz = sizeof(struct kvm); If you are going to introduce an extra variable, please use the correct type (size_t). > + > if (!has_vhe()) > - return kzalloc(sizeof(struct kvm), GFP_KERNEL); > + return kzalloc(sz, GFP_KERNEL | GFP_KERNEL_ACCOUNT); Why both GFP_KERNEL and GFP_KERNEL_ACCOUNT? Thanks, M. -- Without deviation from the norm, progress is not possible. _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm