linux.git/kernel/rcupdate.c, branch v2.6.17.10

[PATCH] RCU: introduce rcu_needs_cpu() interface

2006-05-15T18:20:55+00:00

With "Paul E. McKenney" 

Introduce rcu_needs_cpu() interface.  This can be used to tell if there
will be a new rcu batch on a cpu soon by looking at the curlist pointer.
This can be used to avoid to enter a tickless idle state where the cpu
would miss that a new batch is ready when rcu_start_batch would be called
on a different cpu.

Signed-off-by: Heiko Carstens 
Cc: "Paul E. McKenney" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Remove devinit and cpuinit from notifier_call definitions

2006-04-26T15:30:03+00:00

Few of the notifier_chain_register() callers use __init in the definition
of notifier_call.  It is incorrect as the function definition should be
available after the initializations (they do not unregister them during
initializations).

This patch fixes all such usages to _not_ have the notifier_call __init
section.

Signed-off-by: Chandra Seetharaman 
Signed-off-by: Linus Torvalds

[PATCH] Remove __devinitdata from notifier block definitions

2006-04-26T15:27:50+00:00

Few of the notifier_chain_register() callers use __devinitdata in the
definition of notifier_block data structure.  It is incorrect as the
data structure should be available after the initializations (they do
not unregister them during initializations).

This was leading to an oops when notifier_chain_register() call is
invoked for those callback chains after initialization.

This patch fixes all such usages to _not_ have the notifier_block data
structure in the init data section.

Signed-off-by: Chandra Seetharaman 
Signed-off-by: Linus Torvalds

[PATCH] rcu_process_callbacks: don't cli() while testing ->nxtlist

2006-03-24T15:33:20+00:00

__rcu_process_callbacks() disables interrupts to protect itself from
call_rcu() which adds new entries to ->nxtlist.

However we can check "->nxtlist != NULL" with interrupts enabled, we can't
get "false positives" because call_rcu() can only change this condition
from 0 to 1.

Tested with rcutorture.ko.

Signed-off-by: Oleg Nesterov 
Acked-by: Dipankar Sarma 
Cc: "Paul E. McKenney" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] kernel/rcupdate.c: make two structs static

2006-03-23T15:38:17+00:00

This patch makes two needlessly global structs static.

Signed-off-by: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] convert kernel/rcupdate.c:rcu_barrier_sema to mutex

2006-03-23T15:38:10+00:00

Convert kernel/rcupdate's rcu_barrier_sema to mutex.

Signed-off-by: Ingo Molnar 
Acked-by: "Paul E. McKenney" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] add EXPORT_SYMBOL_GPL_FUTURE() to RCU subsystem

2006-03-20T21:42:58+00:00

As the RCU symbols are going to be changed to GPL in the near future,
lets warn users that this is going to happen.

Cc: Paul McKenney 
Acked-by: Dipankar Sarma 
Signed-off-by: Greg Kroah-Hartman

[PATCH] rcu batch tuning

2006-03-08T22:14:01+00:00

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

[PATCH] rcu: fix hotplug-cpu ->donelist leak

2006-01-10T16:49:47+00:00

Pointed out by Srivatsa Vaddagiri .

rcu_do_batch() stops after processing maxbatch callbacks
on ->donelist leaving rcu_tasklet in TASKLET_STATE_SCHED
state.

If CPU_DEAD event happens remaining ->donelist entries are
lost, rcu_offline_cpu() kills this tasklet.

With this patch ->donelist migrates along with ->curlist
and ->nxtlist to the current cpu.

Compile tested.

Signed-off-by: Oleg Nesterov 
Acked-by: Paul E. McKenney 
Cc: Srivatsa Vaddagiri 
Cc: Dipankar Sarma 
Signed-off-by: Linus Torvalds

[PATCH] rcu: join rcu_ctrlblk and rcu_state

2006-01-10T16:42:50+00:00

This patch moves rcu_state into the rcu_ctrlblk. I think there
are no reasons why we should have 2 different variables to control
rcu state. Every user of rcu_state has also "rcu_ctrlblk *rcp" in
the parameter list.

Signed-off-by: Oleg Nesterov 
Acked-by: Paul E. McKenney 
Signed-off-by: Linus Torvalds