path: root/fs
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authorDipankar Sarma <>2006-03-07 21:55:33 -0800
committerLinus Torvalds <>2006-03-08 14:14:01 -0800
commit21a1ea9eb40411d4ee29448c53b9e4c0654d6ceb (patch)
tree86e4b681858ac562c953bd3ea3c038defd8ec4f4 /fs
parente2bab3d92486fb781f4d06f56339264ed1492392 (diff)
[PATCH] rcu batch tuning
This patch adds new tunables for RCU queue and finished batches. There are two types of controls - number of completed RCU updates invoked in a batch (blimit) and monitoring for high rate of incoming RCUs on a cpu (qhimark, qlowmark). By default, the per-cpu batch limit is set to a small value. If the input RCU rate exceeds the high watermark, we do two things - force quiescent state on all cpus and set the batch limit of the CPU to INTMAX. Setting batch limit to INTMAX forces all finished RCUs to be processed in one shot. If we have more than INTMAX RCUs queued up, then we have bigger problems anyway. Once the incoming queued RCUs fall below the low watermark, the batch limit is set to the default. Signed-off-by: Dipankar Sarma <> Cc: "Paul E. McKenney" <> Cc: "David S. Miller" <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
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