Messages in this thread | | | Date | Thu, 9 May 2019 09:50:04 +0100 | From | Catalin Marinas <> | Subject | Re: icache_is_aliasing and big.LITTLE |
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Hi,
On Wed, May 08, 2019 at 11:45:03AM -0700, Salman Qazi wrote: > What is the intention behind icache_is_aliasing on big.LITTLE systems > where some icaches are VIPT and others are PIPT? Is it meant to be > conservative in some sense or should it be made per-CPU?
It needs to cover the worst case scenario across all CPUs, i.e. aliasing VIPT if one of the CPUs has this. We can't make it per-CPU because a thread performing cache maintenance might be migrated to another CPU with different cache policy (e.g. sync_icache_aliases()).
-- Catalin
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