8fa95abae4
- when kernel copies from userspace, it must be sure that the TLB entries are not stale and thus the referenced memory is correct - everytime we change a process' address space we set p_stale_tlb bits for all CPUs. - Whenever a cpu finds its bit set when it wants to access the process' memory, it refreshes the TLB - it is more conservative than it needs to be but it has low overhead than checking precisely |
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i386 |