On 18.10.2010 4:00, Ralf Baechle wrote:
The aliasing problem is solvable and it may be worth to revisit that old
piece of code again now 15 years later.
Before anybody will start to prepare patches, I'd like to note using
c0_context allows less than 128 processes (their mm contexts in fact but
who cares) to be directly mapped on 32-bit cpus. So, some kind of
caching needs to be implemented and it will add overhead on every mm
switch. Sure, this overhead might be bounded for a real case where there
is a small number of processes, so they all fit in the cache.
--- Beware, wild assumptions here ---
I'm afraid the cost of such caching still will be higher than loading
pgd_current even from main memory on tlb refill.
--- End of wild assumptions ---
Gleb.
