On 07/03/2017 09:40 AM, Peter Maydell wrote:
Since these are defined by system registers, I can imagine there can only be
a few pages for which this fine grained handling might apply any any one
time. This would certainly be preferable to reducing the effectiveness of
the entire TLB by a factor of 16.
Yes, that was somewhat my feeling too -- really tiny TLB pages
are not very nice, and most pages probably won't be finegrained.
Coming back to this, might it make sense to choose a *larger* page size for M
profile? 1K is awfully small. Any idea how aligned the region start/end tends
to be for real applications?
If we're only taking this extra trap for the first and last page of a region,
when the application happens to use a size/alignment that conflicts with the
page size that we choose, then a much larger page size choice might perform
well overall.
r~
