Re: [patch 3/3] x86_64: Node local pda take 2 -- node local pda allocation

[Eric Dumazet]

Ravikiran G Thirumalai a écrit :
> Patch uses a static PDA array early at boot and reallocates processor PDA
> with node local memory when kmalloc is ready, just before pda_init.
> The boot_cpu_pda is needed since the cpu_pda is used even before pda_init for
> that cpu is called.   
> (pda_init is called when APs are brought on at rest_init().  But
> setup_per_cpu_areas is called early in start_kernel and 
> sched_init uses the per-cpu offset table early)

That seems good, thank you !

Do you have an idea of the performance gain we could expect from this node 
local pda allocation ?

Say a CPU is on Node 1,  was a change in pda (allocated on Node 0) immediatly 
mirrored on remote node or not ?

Eric
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