linux-kernel - [Patch v2 0/5] Optimize clear dirty log

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Date:   Fri,  3 Feb 2023 11:28:17 -0800
From:   Vipin Sharma <vipinsh@...gle.com>
To:     seanjc@...gle.com, pbonzini@...hat.com, bgardon@...gle.com,
        dmatlack@...gle.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vipin Sharma <vipinsh@...gle.com>
Subject: [Patch v2 0/5] Optimize clear dirty log

Hi,

This patch series has optimized control flow of clearing dirty log and
improved its performance by ~38%. Patch 2 has more details about
optimization.

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

v2:
- 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 (5):
  KVM: x86/mmu: Make separate function to check for SPTEs atomic write
    conditions
  KVM: x86/mmu: Optimize SPTE change flow for clear-dirty-log
  KVM: x86/mmu: Optimize SPTE change for aging gfn range
  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 |  29 +++++--
 arch/x86/kvm/mmu/tdp_mmu.c  | 163 +++++++++++-------------------------
 2 files changed, 72 insertions(+), 120 deletions(-)

-- 
2.39.1.519.gcb327c4b5f-goog