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authorDavid Matlack <dmatlack@google.com>2021-08-04 22:28:42 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2021-08-06 07:52:29 -0400
commit601f8af01e5ae535b45cdb91234887c9fd861ad4 (patch)
treeb4cba5a72f0b37dcd6ec552c5cf47b3a4018ddbb /tools/perf/scripts/python/export-to-postgresql.py
parent081de470f1e6e83f9f460ba5ae8f57ff07f37692 (diff)
KVM: x86/mmu: Leverage vcpu->last_used_slot for rmap_add and rmap_recycle
rmap_add() and rmap_recycle() both run in the context of the vCPU and thus we can use kvm_vcpu_gfn_to_memslot() to look up the memslot. This enables rmap_add() and rmap_recycle() to take advantage of vcpu->last_used_slot and avoid expensive memslot searching. This change improves the performance of "Populate memory time" in dirty_log_perf_test with tdp_mmu=N. In addition to improving the performance, "Populate memory time" no longer scales with the number of memslots in the VM. Command | Before | After ------------------------------- | ---------------- | ------------- ./dirty_log_perf_test -v64 -x1 | 15.18001570s | 14.99469366s ./dirty_log_perf_test -v64 -x64 | 18.71336392s | 14.98675076s Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: David Matlack <dmatlack@google.com> Message-Id: <20210804222844.1419481-6-dmatlack@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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