Messages in this thread | | | From | (Tim Hollebeek) | Subject | Re: question about M2 "feature" | Date | Tue, 22 Jul 1997 13:43:48 -0400 (EDT) |
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Ingo Molnar writes ... > > we could use that area for free memory handling. > > we could put the single-page usage bitmap there, 8k is enough to handle up > to about 256M RAM if 1 bit represents 1 page. (a bit less than 256M RAM, > since some bits are needed for higher order coverage bits) > > gosh, ~10 cycles __guaranteed__ get_free_page() execution time, ~20 cycles
I'd rather see support for letting it get used from user space. I know other people's needs are different, but for many people, if the kernel is using a significant amount of CPU, something is _wrong_, so it is a waste of time making it run faster.
On the other hand, some of my computational jobs have some small regions of memory which are _very_ hot ...
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