Messages in this thread | | | Date | Sun, 17 May 2009 00:16:40 +0900 | From | Tejun Heo <> | Subject | Re: [GIT PATCH] x86,percpu: fix pageattr handling with remap allocator |
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Hello, Suresh.
Suresh Siddha wrote: > Tejun, Can you please educate me why we need to map this first > percpu chunk (which is pre-allocated during boot and is physically > contiguous) into vmalloc area?
To make areas for each cpu congruent such that the address offset of a percpu symbol for CPU N is always the same from the address for CPU 0.
> Perhaps even for the other dynamically allocated secondary chunks? > (as far as I can see, all the chunk allocations seems to be > physically contiguous and later mapped into vmalloc area).. > > That should simplify these things quite a bit(atleast for first > percpu chunk). I am missing something obvious I guess.
Hmm... Sorry I don't really follow. Can you please elaborate the question?
thanks.
-- tejun
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