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yaml --- r: 299 b: refs/heads/master c: e3b7df6 h: refs/heads/master i: 297: 265017a 295: bc93221 v: v3
git-mirror · Apr 19, 2005 · bec5e7a · bec5e7a
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-refs/heads/master: d098840e37468fdd0143d8bcfe86bc53627bf96e
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diff --git a/trunk/Documentation/aoe/todo.txt b/trunk/Documentation/aoe/todo.txt
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+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 destructore 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.