Re: [patch 00/41] cpu alloc / cpu ops v3: Optimize per cpu access

[Eric Dumazet]

Andrew Morton a écrit :
> It was just an example.  There will be others.
>
> 	tcp_v4_md5_do_add
> 	->tcp_alloc_md5sig_pool
> 	  ->__tcp_alloc_md5sig_pool
>
> does an alloc_percpu for each md5-capable TCP connection.  I think - it
> doesn't matter really, because something _could_.  And if something
> _does_, we're screwed.
>   
Last time I took a look on this stuff, this was a percpu allocation for 
all connections, not for each TCP session.
(It should be static, instead of dynamic )

Really, percpu allocations are currently not frequent at all.

vmalloc()/vfreee() are way more frequent and still use a list.





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