ia64/linux-2.6.18-xen.hg

view Documentation/aoe/todo.txt @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
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.
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.