diff options
author | Peter Zijlstra <peterz@infradead.org> | 2011-07-28 10:43:51 +0200 |
---|---|---|
committer | Steven Rostedt <rostedt@rostedt.homelinux.com> | 2013-03-22 10:21:38 -0400 |
commit | 4819a49030bc23642671791a7a5d415c3e6152a2 (patch) | |
tree | 3d7df7f6dfccc5b6399f42376e39f6698d9cc439 /mm | |
parent | 77608910377693719172b95f878b65efea0c6d0b (diff) |
mm, rt: kmap_atomic scheduling
In fact, with migrate_disable() existing one could play games with
kmap_atomic. You could save/restore the kmap_atomic slots on context
switch (if there are any in use of course), this should be esp easy now
that we have a kmap_atomic stack.
Something like the below.. it wants replacing all the preempt_disable()
stuff with pagefault_disable() && migrate_disable() of course, but then
you can flip kmaps around like below.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
[dvhart@linux.intel.com: build fix]
Link: http://lkml.kernel.org/r/1311842631.5890.208.camel@twins
Diffstat (limited to 'mm')
-rw-r--r-- | mm/memory.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index bf69a50e1118..de978764882d 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3444,6 +3444,7 @@ unlock: #ifdef CONFIG_PREEMPT_RT_FULL void pagefault_disable(void) { + migrate_disable(); current->pagefault_disabled++; /* * make sure to have issued the store before a pagefault @@ -3461,6 +3462,7 @@ void pagefault_enable(void) */ barrier(); current->pagefault_disabled--; + migrate_enable(); } EXPORT_SYMBOL_GPL(pagefault_enable); #endif |