From: Vipin Sharma <vipinsh@google.com>
To: seanjc@google.com, pbonzini@redhat.com, bgardon@google.com,
dmatlack@google.com
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Vipin Sharma <vipinsh@google.com>
Subject: [Patch v3 0/7] Optimize clear dirty log
Date: Fri, 10 Feb 2023 17:46:19 -0800 [thread overview]
Message-ID: <20230211014626.3659152-1-vipinsh@google.com> (raw)
Hi,
This patch series has optimized control flow of clearing dirty log and
improved its performance by ~40% (2% more than v2).
It also got rid of many variants of the handle_changed_spte family of
functions and converged logic to one handle_changed_spte() function. It
also remove tdp_mmu_set_spte_no_[acc_track|dirty_log] and various
booleans for controlling them.
Thanks,
Vipin
v3:
- Tried to do better job at writing commit messages.
- Made kvm_tdp_mmu_clear_spte_bits() similar to the kvm_tdp_mmu_write_spte().
- clear_dirty_pt_masked() evaluates mask for the bit to be cleared outside the
loop and use that for all of the SPTEs instead of calculating for each SPTE.
- Some naming changes based on the feedbacks.
- Split out the dead code clean from the optimization code.
v2: https://lore.kernel.org/lkml/20230203192822.106773-1-vipinsh@google.com/
- Clear dirty log and age gfn range does not go through
handle_changed_spte, they handle their SPTE changes locally to improve
their speed.
- Clear only specific bits atomically when updating SPTEs in clearing
dirty log and aging gfn range functions.
- Removed tdp_mmu_set_spte_no_[acc_track|dirty_log] APIs.
- Converged all handle_changed_spte related functions to one place.
v1: https://lore.kernel.org/lkml/20230125213857.824959-1-vipinsh@google.com/
Vipin Sharma (7):
KVM: x86/mmu: Add a helper function to check if an SPTE needs atomic
write
KVM: x86/mmu: Atomically clear SPTE dirty state in the clear-dirty-log
flow
KVM: x86/mmu: Remove "record_dirty_log" in __tdp_mmu_set_spte()
KVM: x86/mmu: Optimize SPTE change for aging gfn range
KVM: x86/mmu: Remove "record_acc_track" in __tdp_mmu_set_spte()
KVM: x86/mmu: Remove handle_changed_spte_dirty_log()
KVM: x86/mmu: Merge all handle_changed_pte* functions.
arch/x86/kvm/mmu/tdp_iter.h | 48 ++++++---
arch/x86/kvm/mmu/tdp_mmu.c | 190 ++++++++++++------------------------
2 files changed, 96 insertions(+), 142 deletions(-)
--
2.39.1.581.gbfd45094c4-goog
next reply other threads:[~2023-02-11 1:46 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-11 1:46 Vipin Sharma [this message]
2023-02-11 1:46 ` [Patch v3 1/7] KVM: x86/mmu: Add a helper function to check if an SPTE needs atomic write Vipin Sharma
2023-02-11 1:46 ` [Patch v3 2/7] KVM: x86/mmu: Atomically clear SPTE dirty state in the clear-dirty-log flow Vipin Sharma
2023-02-15 21:12 ` David Matlack
2023-03-17 22:59 ` Sean Christopherson
2023-03-17 23:50 ` Vipin Sharma
2023-02-11 1:46 ` [Patch v3 3/7] KVM: x86/mmu: Remove "record_dirty_log" in __tdp_mmu_set_spte() Vipin Sharma
2023-02-15 21:10 ` David Matlack
2023-02-11 1:46 ` [Patch v3 4/7] KVM: x86/mmu: Optimize SPTE change for aging gfn range Vipin Sharma
2023-02-15 21:15 ` David Matlack
2023-03-21 0:51 ` Sean Christopherson
2023-02-11 1:46 ` [Patch v3 5/7] KVM: x86/mmu: Remove "record_acc_track" in __tdp_mmu_set_spte() Vipin Sharma
2023-02-22 19:31 ` David Matlack
2023-02-11 1:46 ` [Patch v3 6/7] KVM: x86/mmu: Remove handle_changed_spte_dirty_log() Vipin Sharma
2023-02-22 19:36 ` David Matlack
2023-02-11 1:46 ` [Patch v3 7/7] KVM: x86/mmu: Merge all handle_changed_pte* functions Vipin Sharma
2023-02-22 19:42 ` David Matlack
2023-03-17 22:51 ` Sean Christopherson
2023-03-17 23:48 ` Vipin Sharma
2023-03-17 22:57 ` [Patch v3 0/7] Optimize clear dirty log Sean Christopherson
2023-03-17 23:51 ` Vipin Sharma
2023-03-21 0:41 ` Sean Christopherson
2023-03-21 18:11 ` Vipin Sharma
2023-03-21 19:57 ` Sean Christopherson
2023-03-21 20:40 ` Sean Christopherson
2023-03-21 21:38 ` Sean Christopherson
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