On Sat, 8 Apr 2023 at 04:01, Nicholas Piggin wrote:
>
> This series adds initial KVM selftests support for powerpc
> (64-bit, BookS, radix MMU).
This means the tests won't work on power8. Perhaps you could add
something like this?
--- a/tools/testing/selftests/kvm/lib/powerpc/processor.c
+++
On 2023-04-07 09:01:29, Sean Christopherson wrote:
> On Fri, Apr 07, 2023, Bagas Sanjaya wrote:
> > On Fri, Apr 07, 2023 at 05:31:47AM -0400, Kautuk Consul wrote:
> > > I used the unlikely() macro on the return values of the k.alloc
> > > calls and found that it changes the code generation a bit.
From: Yicong Yang
Though ARM64 has the hardware to do tlb shootdown, the hardware
broadcasting is not free.
A simplest micro benchmark shows even on snapdragon 888 with only
8 cores, the overhead for ptep_clear_flush is huge even for paging
out one page mapped by only one process:
5.36% a.out
From: Barry Song
on x86, batched and deferred tlb shootdown has lead to 90%
performance increase on tlb shootdown. on arm64, HW can do
tlb shootdown without software IPI. But sync tlbi is still
quite expensive.
Even running a simplest program which requires swapout can
prove this is true,
From: Anshuman Khandual
The entire scheme of deferred TLB flush in reclaim path rests on the
fact that the cost to refill TLB entries is less than flushing out
individual entries by sending IPI to remote CPUs. But architecture
can have different ways to evaluate that. Hence apart from checking
On Fri, Apr 7, 2023 at 2:51 AM Nathan Chancellor wrote:
>
> When building with W=1 after commit 80b6093b55e3 ("kbuild: add -Wundef
> to KBUILD_CPPFLAGS for W=1 builds"), the following warning occurs.
>
> In file included from arch/powerpc/kvm/bookehv_interrupts.S:26:
>
