diff options
author | Peter Zijlstra <peterz@infradead.org> | 2011-07-28 10:43:51 +0200 |
---|---|---|
committer | Clark Williams <williams@redhat.com> | 2012-04-10 16:37:32 -0500 |
commit | 0be272966b37cc710ab69435918443bf0e769008 (patch) | |
tree | fab9d243ef0d8df85f562c98edc2d126c8a7ea96 /mm | |
parent | 8572f5439b93d901937148ce24e665f3019f70ad (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 af0df1af47c8..a3ae5e7b0bfc 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3447,6 +3447,7 @@ 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 @@ -3464,6 +3465,7 @@ void pagefault_enable(void) */ barrier(); current->pagefault_disabled--; + migrate_enable(); } EXPORT_SYMBOL_GPL(pagefault_enable); #endif |