Re: [PATCH 01/13] mm: Update ptep_get_lockless()s comment

[Nadav Amit]

On Oct 27, 2022, at 12:27 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

>> One alternative may be using mm_tlb_flush_pending() when setting a new PTE
>> to check for pending flushes and flushing the TLB if that is the case. This
>> is somewhat similar to what ptep_clear_flush() does. Anyhow, I guess this
>> might induce some overheads. As noted before, it is possible to track
>> pending TLB flushes in VMA/page-table granularity, with different tradeoffs
>> of overheads.
> 
> Right; I just don't believe in VMAs for this, they're *waaay* to big.

Well, I did it for VMA in an RFC only because I was pushed. I thought and do
think that page-table granularity is the right one.