Re: [PATCH v4 0/3] targeted TLB sync IPIs for lockless page table

[Dave Hansen]

On 2/5/26 07:01, Lance Yang wrote:
> So for now, neither approach looks good: tracking on the read side adss
> cost to GUP-fast, and syncing on the write side e.g. synchronize_rcu()
> is too slow on large systems.

Which of the writers truly *need* synchronize_rcu()?

What are they doing with the memory that they can't move forward unless
it's quiescent *now*?