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Linux Cross Reference
Linux-2.6.17/Documentation/aoe/todo.txt

Version: ~ [ 2.6.16 ] ~ [ 2.6.17 ] ~
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  1 There is a potential for deadlock when allocating a struct sk_buff for
  2 data that needs to be written out to aoe storage.  If the data is
  3 being written from a dirty page in order to free that page, and if
  4 there are no other pages available, then deadlock may occur when a
  5 free page is needed for the sk_buff allocation.  This situation has
  6 not been observed, but it would be nice to eliminate any potential for
  7 deadlock under memory pressure.
  8 
  9 Because ATA over Ethernet is not fragmented by the kernel's IP code,
 10 the destructore member of the struct sk_buff is available to the aoe
 11 driver.  By using a mempool for allocating all but the first few
 12 sk_buffs, and by registering a destructor, we should be able to
 13 efficiently allocate sk_buffs without introducing any potential for
 14 deadlock.
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