Re: About ioremap() and L2-Cache
Systemkennung Linux (linux@mailhost.uni-koblenz.de)
Wed, 23 Jul 1997 04:32:36 +0200 (MET DST)
> about the PWT bit. if it's needed, __ioremap(flags) can be called with any
> caching flag. (which will be written into the page table entry). Is there
> any RL use for the PWT bit?
It might be interesting for clearing pages etc. to avoid unecessary
dirtying the caches where the probability of the data being used again
is relativly small. A bit a different cache trick speeds up the
performance of clear_page() on MIPS by a factor of two.
Ralf