[v1] target/arm: Reduce tlb_flush overhead

[Qemu-devel] [PATCH 0/3] target/arm: Reduce tlb_flush overhead

Richard Henderson posted 3 patches 5 years, 6 months ago

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target/arm/helper.c | 26 +++++++++++++-------------
1 file changed, 13 insertions(+), 13 deletions(-)

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[Qemu-devel] [PATCH 0/3] target/arm: Reduce tlb_flush overhead

Posted by Richard Henderson 5 years, 6 months ago

While installing AArch64 Ubuntu into a new vm,
I happened to notice that tlb_flush+memset was
consuming 25% of the total runtime.

This patch set reduces that overhead to 10%.
Full tlb flushes are down to 11k from 1.8M,
when pausing the installation at the first menu.


r~


Richard Henderson (3):
  target/arm: Remove writefn from TTBR0_EL3
  target/arm: Only flush tlb if ASID changes
  target/arm: Flush only the TLBs affected by TTBR*_EL1

 target/arm/helper.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

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2.17.2