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Diffstat (limited to 'Documentation/aoe/todo.txt')
| -rw-r--r-- | Documentation/aoe/todo.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/aoe/todo.txt b/Documentation/aoe/todo.txt new file mode 100644 index 000000000..c09dfad4a --- /dev/null +++ b/Documentation/aoe/todo.txt @@ -0,0 +1,14 @@ +There is a potential for deadlock when allocating a struct sk_buff for +data that needs to be written out to aoe storage. If the data is +being written from a dirty page in order to free that page, and if +there are no other pages available, then deadlock may occur when a +free page is needed for the sk_buff allocation. This situation has +not been observed, but it would be nice to eliminate any potential for +deadlock under memory pressure. + +Because ATA over Ethernet is not fragmented by the kernel's IP code, +the destructor member of the struct sk_buff is available to the aoe +driver. By using a mempool for allocating all but the first few +sk_buffs, and by registering a destructor, we should be able to +efficiently allocate sk_buffs without introducing any potential for +deadlock. |