From: Yosry Ahmed <yosryahmed@google.com>
To: Tejun Heo <tj@kernel.org>, Johannes Weiner <hannes@cmpxchg.org>,
Zefan Li <lizefan.x@bytedance.com>, Marc Zyngier <maz@kernel.org>,
James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@kernel.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Shakeel Butt <shakeelb@google.com>,
Oliver Upton <oupton@google.com>
Cc: 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, Yosry Ahmed <yosryahmed@google.com>
Subject: [PATCH v4 4/4] KVM: arm64/mmu: count KVM s2 mmu usage in secondary pagetable stats
Date: Fri, 29 Apr 2022 20:11:31 +0000 [thread overview]
Message-ID: <20220429201131.3397875-5-yosryahmed@google.com> (raw)
In-Reply-To: <20220429201131.3397875-1-yosryahmed@google.com>
Count the pages used by KVM in arm64 for stage2 mmu in secondary pagetable
stats.
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
---
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);
+ return virt;
}
static void *kvm_host_zalloc_pages_exact(size_t size)
@@ -102,6 +106,20 @@ static void *kvm_host_zalloc_pages_exact(size_t size)
return alloc_pages_exact(size, GFP_KERNEL_ACCOUNT | __GFP_ZERO);
}
+static void *kvm_s2_zalloc_pages_exact(size_t size)
+{
+ void *virt = kvm_host_zalloc_pages_exact(size);
+ if (virt)
+ kvm_account_pgtable_pages(virt, +(size >> PAGE_SHIFT));
+ return virt;
+}
+
+static void kvm_s2_free_pages_exact(void *virt, size_t size)
+{
+ kvm_account_pgtable_pages(virt, -(size >> PAGE_SHIFT));
+ free_pages_exact(virt, size);
+}
+
static void kvm_host_get_page(void *addr)
{
get_page(virt_to_page(addr));
@@ -112,6 +130,15 @@ static void kvm_host_put_page(void *addr)
put_page(virt_to_page(addr));
}
+static void kvm_s2_put_page(void *addr)
+{
+ struct page *p = virt_to_page(addr);
+ /* Dropping last refcount, the page will be freed */
+ if (page_count(p) == 1)
+ kvm_account_pgtable_pages(addr, -1);
+ put_page(p);
+}
+
static int kvm_host_page_count(void *addr)
{
return page_count(virt_to_page(addr));
@@ -603,10 +630,10 @@ static int get_user_mapping_size(struct kvm *kvm, u64 addr)
static struct kvm_pgtable_mm_ops kvm_s2_mm_ops = {
.zalloc_page = stage2_memcache_zalloc_page,
- .zalloc_pages_exact = kvm_host_zalloc_pages_exact,
- .free_pages_exact = free_pages_exact,
+ .zalloc_pages_exact = kvm_s2_zalloc_pages_exact,
+ .free_pages_exact = kvm_s2_free_pages_exact,
.get_page = kvm_host_get_page,
- .put_page = kvm_host_put_page,
+ .put_page = kvm_s2_put_page,
.page_count = kvm_host_page_count,
.phys_to_virt = kvm_host_va,
.virt_to_phys = kvm_host_pa,
--
2.36.0.464.gb9c8b46e94-goog
next prev parent reply other threads:[~2022-04-29 20:12 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-29 20:11 [PATCH v4 0/4] KVM: mm: count KVM mmu usage in memory stats Yosry Ahmed
2022-04-29 20:11 ` [PATCH v4 1/4] mm: add NR_SECONDARY_PAGETABLE to count secondary page table uses Yosry Ahmed
2022-05-02 10:01 ` Marc Zyngier
2022-05-02 18:46 ` Yosry Ahmed
2022-05-09 16:38 ` Yosry Ahmed
2022-05-12 20:36 ` Shakeel Butt
2022-05-12 23:07 ` Johannes Weiner
2022-05-12 23:29 ` Sean Christopherson
2022-05-13 15:50 ` Johannes Weiner
2022-05-13 16:12 ` Sean Christopherson
2022-05-13 16:22 ` Yosry Ahmed
2022-05-13 17:13 ` Shakeel Butt
2022-05-20 1:56 ` Yosry Ahmed
2022-05-20 14:39 ` Johannes Weiner
2022-05-24 22:31 ` Yosry Ahmed
2022-05-25 11:56 ` Johannes Weiner
2022-05-26 0:38 ` Sean Christopherson
2022-05-27 18:33 ` Yosry Ahmed
2022-06-03 16:42 ` Johannes Weiner
2022-04-29 20:11 ` [PATCH v4 2/4] KVM: mmu: add a helper to account memory used by KVM mmu Yosry Ahmed
2022-04-29 20:11 ` [PATCH v4 3/4] KVM: x86/mmu: count KVM mmu usage in secondary pagetable stats Yosry Ahmed
2022-07-22 20:58 ` Mingwei Zhang
2022-07-26 18:03 ` Sean Christopherson
2022-04-29 20:11 ` Yosry Ahmed [this message]
2022-05-02 7:24 ` [PATCH v4 4/4] KVM: arm64/mmu: count KVM s2 " Oliver Upton
2022-05-02 9:49 ` Marc Zyngier
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