Re: Efficient IPC mechanism on Linux

[Timothy Miller]

Luca Veraldi wrote:

> Sorry, but I cannot believe it.
> Reading a page tagle entry and storing in into a struct capability is not
> comparable at all with the "for" needed to move bytes all around memory.


Pardon my ignorance here, but the impression I get is that changing a 
page table entry is not as simple as just writing to a bit somewhere.  I 
suppose it is if the page descriptor is not loaded into the TLB, but if 
it is, then you have to ensure that the TLB entry matches the page 
table; this may not be a quick operation.

I can think of a lot of other possible complications to this.

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