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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-12-03 08:16:28 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-03-26 08:04:48 -0700
commita488985851cf2facd2227bd982cc2c251df56268 (patch)
tree450d84d1fc01bd7997b651e47d2587fac5c6f085 /init
parent09c7b890622d72b5e004cc249bbe610e8b928ddf (diff)
downloadlinux-linaro-stable-a488985851cf2facd2227bd982cc2c251df56268.tar.gz
rcu: Distinguish "rcuo" kthreads by RCU flavor
Currently, the per-no-CBs-CPU kthreads are named "rcuo" followed by the CPU number, for example, "rcuo". This is problematic given that there are either two or three RCU flavors, each of which gets a per-CPU kthread with exactly the same name. This commit therefore introduces a one-letter abbreviation for each RCU flavor, namely 'b' for RCU-bh, 'p' for RCU-preempt, and 's' for RCU-sched. This abbreviation is used to distinguish the "rcuo" kthreads, for example, for CPU 0 we would have "rcuob/0", "rcuop/0", and "rcuos/0". Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig13
1 files changed, 7 insertions, 6 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 307499704580..717584064a7e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -666,12 +666,13 @@ config RCU_NOCB_CPU
This option offloads callback invocation from the set of
CPUs specified at boot time by the rcu_nocbs parameter.
- For each such CPU, a kthread ("rcuoN") will be created to
- invoke callbacks, where the "N" is the CPU being offloaded.
- Nothing prevents this kthread from running on the specified
- CPUs, but (1) the kthreads may be preempted between each
- callback, and (2) affinity or cgroups can be used to force
- the kthreads to run on whatever set of CPUs is desired.
+ For each such CPU, a kthread ("rcuox/N") will be created to
+ invoke callbacks, where the "N" is the CPU being offloaded,
+ and where the "x" is "b" for RCU-bh, "p" for RCU-preempt, and
+ "s" for RCU-sched. Nothing prevents this kthread from running
+ on the specified CPUs, but (1) the kthreads may be preempted
+ between each callback, and (2) affinity or cgroups can be used
+ to force the kthreads to run on whatever set of CPUs is desired.
Say Y here if you want to help to debug reduced OS jitter.
Say N here if you are unsure.