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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-07-01 20:26:57 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-08 01:27:20 +0200 |
| commit | bde6c3aa993066acb0d6ce32ecabe03b9d5df92d (patch) | |
| tree | 09ec78a9cfa751ce36288c32c4e5112f34af8582 /mm/mlock.c | |
| parent | rcu: Add call_rcu_tasks() (diff) | |
| download | linux-bde6c3aa993066acb0d6ce32ecabe03b9d5df92d.tar.xz linux-bde6c3aa993066acb0d6ce32ecabe03b9d5df92d.zip | |
rcu: Provide cond_resched_rcu_qs() to force quiescent states in long loops
RCU-tasks requires the occasional voluntary context switch
from CPU-bound in-kernel tasks. In some cases, this requires
instrumenting cond_resched(). However, there is some reluctance
to countenance unconditionally instrumenting cond_resched() (see
http://lwn.net/Articles/603252/), so this commit creates a separate
cond_resched_rcu_qs() that may be used in place of cond_resched() in
locations prone to long-duration in-kernel looping.
This commit currently instruments only RCU-tasks. Future possibilities
include also instrumenting RCU, RCU-bh, and RCU-sched in order to reduce
IPI usage.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'mm/mlock.c')
| -rw-r--r-- | mm/mlock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mlock.c b/mm/mlock.c index ce84cb0b83ef..ab3150c26711 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -789,7 +789,7 @@ static int do_mlockall(int flags) /* Ignore errors */ mlock_fixup(vma, &prev, vma->vm_start, vma->vm_end, newflags); - cond_resched(); + cond_resched_rcu_qs(); } out: return 0; |