diff options
| author | David Matlack <dmatlack@google.com> | 2022-01-20 02:07:38 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-02-10 21:50:43 +0300 |
| commit | e0b728b1f1a951e0d23eef08cfa920a8104e39db (patch) | |
| tree | 23a212f7a7957e0ba4a533fe661cac9bd1b9b39b /arch/x86/kvm/mmu/tdp_mmu.c | |
| parent | cb00a70bd4b7e42dcbd6cd80b3f1697b10cdb44e (diff) | |
| download | linux-e0b728b1f1a951e0d23eef08cfa920a8104e39db.tar.xz | |
KVM: x86/mmu: Add tracepoint for splitting huge pages
Add a tracepoint that records whenever KVM eagerly splits a huge page
and the error status of the split to indicate if it succeeded or failed
and why.
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20220119230739.2234394-18-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu/tdp_mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu/tdp_mmu.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index dae2cebcf8b5..8def8f810cb0 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -1347,7 +1347,7 @@ static int tdp_mmu_split_huge_page(struct kvm *kvm, struct tdp_iter *iter, */ ret = tdp_mmu_link_sp(kvm, iter, sp, false, shared); if (ret) - return ret; + goto out; /* * tdp_mmu_link_sp_atomic() will handle subtracting the huge page we @@ -1356,7 +1356,9 @@ static int tdp_mmu_split_huge_page(struct kvm *kvm, struct tdp_iter *iter, */ kvm_update_page_stats(kvm, level - 1, PT64_ENT_PER_PAGE); - return 0; +out: + trace_kvm_mmu_split_huge_page(iter->gfn, huge_spte, level, ret); + return ret; } static int tdp_mmu_split_huge_pages_root(struct kvm *kvm, @@ -1393,6 +1395,9 @@ retry: sp = tdp_mmu_alloc_sp_for_split(kvm, &iter, shared); if (!sp) { ret = -ENOMEM; + trace_kvm_mmu_split_huge_page(iter.gfn, + iter.old_spte, + iter.level, ret); break; } @@ -1416,7 +1421,6 @@ retry: if (sp) tdp_mmu_free_sp(sp); - return ret; } |