Re: [PATCH v11 0/5] arm64: mte: allow async MTE to be upgraded to sync on a per-CPU basis

On Tue, 27 Jul 2021 13:52:54 -0700, Peter Collingbourne wrote:

On some CPUs the performance of MTE in synchronous mode is similar
to that of asynchronous mode. This makes it worthwhile to enable
synchronous mode on those CPUs when asynchronous mode is requested,
in order to gain the error detection benefits of synchronous mode
without the performance downsides. Therefore, make it possible for
user programs to opt into upgrading to synchronous mode on those CPUs.

[...]

Applied to arm64 (for-next/mte) but first added Will's acks from v10 an
changed the Documentation/ patch to state "when scheduling" instead of
"when running". Thanks!

[1/5] arm64: mte: rename gcr_user_excl to mte_ctrl
      https://git.kernel.org/arm64/c/638982a03fbc
[2/5] arm64: mte: change ASYNC and SYNC TCF settings into bitfields
      https://git.kernel.org/arm64/c/433c38f40f6a
[3/5] arm64: move preemption disablement to prctl handlers
      https://git.kernel.org/arm64/c/d2e0d8f9746d
[4/5] arm64: mte: introduce a per-CPU tag checking mode preference
      https://git.kernel.org/arm64/c/dd061616edcf
[5/5] Documentation: document the preferred tag checking mode feature
      https://git.kernel.org/arm64/c/80c7c36fb3dd

-- 
Catalin


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