path: root/init
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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-12-02 12:10:16 -0800
committerIngo Molnar <mingo@elte.hu>2009-12-03 11:35:27 +0100
commit8bfb2f8e655b9d0c45fde679fcd5fd97e34513db (patch)
tree2a37bd385f3a6012ced116b1ff8d8cd3b8efb289 /init
parentd9a3da0699b24a589b27a61e1a5b5bd30d9db669 (diff)
rcu: Make RCU's CPU-stall detector be default
The RCU_CPU_STALL_DETECTOR costs almost nothing and has located some bugs that might otherwise have been difficult to track down. Make it be default for the TREE RCU implementations. The vmlinux size impact is limited (on 64-bit x86 defconfig): text data bss dec hex filename 8440248 1260076 995588 10695912 a334e8 vmlinux.before 8440774 1260060 995588 10696422 a336e6 vmlinux.after +526 bytes - acceptable default cost. For RAM starved systems, TINY_RCU does not support CPU-stall detection and is much smaller, but then again it is a uniprocessor... Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <12597846162906-git-send-email-> [ v2: added image size calculations to the changelog ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
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