diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2011-07-28 10:43:51 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@rostedt.homelinux.com> | 2014-02-26 21:20:57 -0500 |
| commit | 96dc36254857d1885e8b5431086e8eb25cf5f0d6 (patch) | |
| tree | d071d83238424ac8deaf223d2674c93f43205fee /include | |
| parent | b9f6c08bd99b25aeaf7c5f4141f1e2958cb9f716 (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 'include')
| -rw-r--r-- | include/linux/sched.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 0dd589db6ef1..390a21caa8ee 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -63,6 +63,7 @@ struct sched_param { #include <linux/nodemask.h> #include <linux/mm_types.h> +#include <asm/kmap_types.h> #include <asm/page.h> #include <asm/ptrace.h> #include <asm/cputime.h> @@ -1656,6 +1657,10 @@ struct task_struct { struct rcu_head put_rcu; int softirq_nestcnt; #endif +#if defined CONFIG_PREEMPT_RT_FULL && defined CONFIG_HIGHMEM + int kmap_idx; + pte_t kmap_pte[KM_TYPE_NR]; +#endif }; #ifdef CONFIG_PREEMPT_RT_FULL |