path: root/Documentation/RCU/whatisRCU.txt
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authorEric Dumazet <edumazet@google.com>2012-10-18 04:55:36 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-11-13 14:07:57 -0800
commit878d7439d0f45a95869e417576774673d1fa243f (patch)
treebf16331cb2e31ab00fe69d91755b7ac6ccb6a7d6 /Documentation/RCU/whatisRCU.txt
parent62da1921292ef789c23a7bf01d671d7572baf377 (diff)
rcu: Fix batch-limit size problem
Commit 29c00b4a1d9e27 (rcu: Add event-tracing for RCU callback invocation) added a regression in rcu_do_batch() Under stress, RCU is supposed to allow to process all items in queue, instead of a batch of 10 items (blimit), but an integer overflow makes the effective limit being 1. So, unless there is frequent idle periods (during which RCU ignores batch limits), RCU can be forced into a state where it cannot keep up with the callback-generation rate, eventually resulting in OOM. This commit therefore converts a few variables in rcu_do_batch() from int to long to fix this problem, along with the module parameters controlling the batch limits. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: <stable@vger.kernel.org> # 3.2 +
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