Meaning of gfp_mask in linux Kernel

[Guest ha-as]

Hello,

 

What is the meaning of the second argument in the `alloc_skb`, the `gfp_mask`??

 

And how does it value effect the allocation in the kernel?

 

And which value does the tcp engine uses to allocate sk_buff in its different queues?

 

Thanks a lot.

 

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