Re: Purpose of the mm/slab.c changes

[Davide Libenzi]

On 09-Sep-2001 Rik van Riel wrote:
> On Sun, 9 Sep 2001, Davide Libenzi wrote:
> 
>> Do You see it as a plus ?
>> The new allocated slab will be very likely written ( w/o regard
>> about the old content ) and an L2 mapping will generate
>> invalidate traffic.
> 
> If your invalidates are slower than your RAM, you should
> consider getting another computer.

You mean a Sun, that uses a separate bus for snooping ? :)
Besides to not under estimate the cache coherency traffic ( that on many CPUs
uses the main memory bus ) there's the fact that the old data eventually
present in L2 won't be used by the new slab user.

- Davide