On Thu, Apr 19, 2012 at 07:26:35PM +0300, Avi Kivity wrote:
> This patchset simplifies the freeing by RCU of mmu pages.
>
> Xiao, I'm sure you thought of always freeing by RCU. Why didn't you choose
> this way? I saves a couple of atomics in the fast path.
>
> Avi Kivity (2):
> KVM: MMU: Always free shadow pages using RCU
> KVM: MMU: Recover space used by rcu_head in struct kvm_mmu_page
>
> arch/x86/include/asm/kvm_host.h | 9 +++---
> arch/x86/kvm/mmu.c | 58
> ++++++++-------------------------------
> 2 files changed, 15 insertions(+), 52 deletions(-)
Check Documentation/RCU/checklist.txt item 8.
a. Keeping a count of the number of data-structure elements
used by the RCU-protected data structure, including
those waiting for a grace period to elapse. Enforce a
limit on this number, stalling updates as needed to allow
previously deferred frees to complete. Alternatively,
limit only the number awaiting deferred free rather than
the total number of elements.
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