Re: [PATCH] Make xfrm subsystem optional

["David S. Miller" <davem@redhat.com>]

   From: Andi Kleen <ak@suse.de>
   Date: Sat, 14 Jun 2003 20:32:32 +0200

   On Sat, Jun 14, 2003 at 04:26:36AM -0700, David S. Miller wrote:
   >    From: Andi Kleen <ak@suse.de>
   >    Date: Sat, 14 Jun 2003 12:18:51 +0200
   >    
   >    Allocating it at first lookup would be racy (would need a nasty
   >    spinlock at least). It may be possible at first policy setup, but
   >    it's not guaranteed you can still get two 32K continuous areas. You
   >    could fall back to vmalloc I guess.
   > 
   > Andi, you're getting rediculious.  Add a xfrm_whatever_init() call
   > and allocate the table there.
   
   Did you actually read what I wrote? Allocating on init is useless
   from the bloat perspective because it's 100% equivalent to an BSS 
   allocation.
   
If dynamic, you could allocate a "tiny" hash table or whatever
on bootup and grow it as usage increases, much like we grow the
FIB hashes dynamically.