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| author | Yosry Ahmed <yosryahmed@google.com> | 2022-08-23 00:46:37 +0000 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2022-08-30 07:41:12 -0700 |
| commit | 43a063cab325ee7cc50349967e536b3cd4e57f03 (patch) | |
| tree | ef1028659ec2f62930896e5d56eb54b0e46c612f /include/linux/kvm_host.h | |
| parent | ebc97a52b5d6cd5fb0c15a3fc9cdd6eb924646a1 (diff) | |
| download | lwn-43a063cab325ee7cc50349967e536b3cd4e57f03.tar.gz lwn-43a063cab325ee7cc50349967e536b3cd4e57f03.zip | |
KVM: x86/mmu: count KVM mmu usage in secondary pagetable stats.
Count the pages used by KVM mmu on x86 in memory stats under secondary
pagetable stats (e.g. "SecPageTables" in /proc/meminfo) to give better
visibility into the memory consumption of KVM mmu in a similar way to
how normal user page tables are accounted.
Add the inner helper in common KVM, ARM will also use it to count stats
in a future commit.
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Acked-by: Marc Zyngier <maz@kernel.org> # generic KVM changes
Link: https://lore.kernel.org/r/20220823004639.2387269-3-yosryahmed@google.com
Link: https://lore.kernel.org/r/20220823004639.2387269-4-yosryahmed@google.com
[sean: squash x86 usage to workaround modpost issues]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'include/linux/kvm_host.h')
| -rw-r--r-- | include/linux/kvm_host.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index f4519d3689e1..04c7e5f2f727 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -2248,6 +2248,19 @@ static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu) #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */ /* + * If more than one page is being (un)accounted, @virt must be the address of + * the first page of a block of pages what were allocated together (i.e + * accounted together). + * + * kvm_account_pgtable_pages() is thread-safe because mod_lruvec_page_state() + * is thread-safe. + */ +static inline void kvm_account_pgtable_pages(void *virt, int nr) +{ + mod_lruvec_page_state(virt_to_page(virt), NR_SECONDARY_PAGETABLE, nr); +} + +/* * This defines how many reserved entries we want to keep before we * kick the vcpu to the userspace to avoid dirty ring full. This * value can be tuned to higher if e.g. PML is enabled on the host. |