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#ifndef __LITMUS_AFFINITY_H
#define __LITMUS_AFFINITY_H
#include <linux/cpumask.h>
/*
L1 (instr) = depth 0
L1 (data) = depth 1
L2 = depth 2
L3 = depth 3
*/
#define NUM_CACHE_LEVELS 4
struct neighborhood
{
unsigned int size[NUM_CACHE_LEVELS];
cpumask_var_t neighbors[NUM_CACHE_LEVELS];
};
/* topology info is stored redundently in a big array for fast lookups */
extern struct neighborhood neigh_info[NR_CPUS];
void init_topology(void); /* called by Litmus module's _init_litmus() */
/* Works like:
void get_nearest_available_cpu(
cpu_entry_t **nearest,
cpu_entry_t *start,
cpu_entry_t *entries,
int release_master)
Set release_master = NO_CPU for no Release Master.
We use a macro here to exploit the fact that C-EDF and G-EDF
have similar structures for their cpu_entry_t structs, even though
they do not share a common base-struct. The macro allows us to
avoid code duplication.
TODO: Factor out the job-to-processor linking from C/G-EDF into
a reusable "processor mapping". (See B.B.'s RTSS'09 paper &
dissertation.)
*/
#define get_nearest_available_cpu(nearest, start, entries, release_master) \
{ \
(nearest) = NULL; \
if (!(start)->linked) { \
(nearest) = (start); \
} else { \
int __level; \
int __cpu; \
int __release_master = ((release_master) == NO_CPU) ? -1 : (release_master); \
struct neighborhood *__neighbors = &neigh_info[(start)->cpu]; \
\
for (__level = 0; (__level < NUM_CACHE_LEVELS) && !(nearest); ++__level) { \
if (__neighbors->size[__level] > 1) { \
for_each_cpu(__cpu, __neighbors->neighbors[__level]) { \
if (__cpu != __release_master) { \
cpu_entry_t *__entry = &per_cpu((entries), __cpu); \
if (!__entry->linked) { \
(nearest) = __entry; \
break; \
} \
} \
} \
} else if (__neighbors->size[__level] == 0) { \
break; \
} \
} \
} \
\
if ((nearest)) { \
TRACE("P%d is closest available CPU to P%d\n", \
(nearest)->cpu, (start)->cpu); \
} else { \
TRACE("Could not find an available CPU close to P%d\n", \
(start)->cpu); \
} \
}
#endif
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