diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2011-07-28 08:43:51 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:19:53 (GMT) |
| commit | 24a92055470f7d51209baa08bc015564438d0e8a (patch) | |
| tree | ba50dfbb23c0c5633e27e7f42d729634550cf3c2 /include/linux/sched.h | |
| parent | 29b03268a7cca25fc60f2b5ec62c85f426f48257 (diff) | |
| download | linux-fsl-qoriq-24a92055470f7d51209baa08bc015564438d0e8a.tar.xz | |
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
[tglx@linutronix.de: Get rid of the per cpu variable and store the idx
and the pte content right away in the task struct.
Shortens the context switch code. ]
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index b6a1bfe..49afe5b 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -23,6 +23,7 @@ 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> @@ -1441,6 +1442,12 @@ struct task_struct { struct rcu_head put_rcu; int softirq_nestcnt; #endif +#ifdef CONFIG_PREEMPT_RT_FULL +# if defined CONFIG_HIGHMEM || defined CONFIG_X86_32 + int kmap_idx; + pte_t kmap_pte[KM_TYPE_NR]; +# endif +#endif }; #ifdef CONFIG_NUMA_BALANCING |