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Set tunable value as well as min/max values

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Some tunable values and their minimum/maximum values must be determinted
at run-time.  Add TUNABLE_SET_WITH_BOUNDS and TUNABLE_SET_WITH_BOUNDS_FULL
to update tunable value together with minimum and maximum values.
__tunable_set_val is updated to set tunable value as well as min/max
values.
This commit is contained in:
H.J. Lu
2020-06-01 14:11:32 -07:00
parent c670278934
commit dfb8e514cf
3 changed files with 82 additions and 8 deletions
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45
elf/dl-tunables.c
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@ -100,8 +100,42 @@ get_next_env (char **envp, char **name, size_t *namelen, char **val,
} \
})
#define TUNABLE_SET_BOUNDS_IF_VALID(__cur, __minp, __maxp, __type) \
({ \
if (__minp != NULL) \
{ \
/* MIN is specified. */ \
__type min = *((__type *) __minp); \
if (__maxp != NULL) \
{ \
/* Both MIN and MAX are specified. */ \
__type max = *((__type *) __maxp); \
if (max >= min \
&& max <= (__cur)->type.max \
&& min >= (__cur)->type.min) \
{ \
(__cur)->type.min = min; \
(__cur)->type.max = max; \
} \
} \
else if (min > (__cur)->type.min && min <= (__cur)->type.max) \
{ \
/* Only MIN is specified. */ \
(__cur)->type.min = min; \
} \
} \
else if (__maxp != NULL) \
{ \
/* Only MAX is specified. */ \
__type max = *((__type *) __maxp); \
if (max < (__cur)->type.max && max >= (__cur)->type.min) \
(__cur)->type.max = max; \
} \
})
static void
do_tunable_update_val (tunable_t *cur, const void *valp)
do_tunable_update_val (tunable_t *cur, const void *valp,
const void *minp, const void *maxp)
{
uint64_t val;
@ -112,16 +146,19 @@ do_tunable_update_val (tunable_t *cur, const void *valp)
{
case TUNABLE_TYPE_INT_32:
{
TUNABLE_SET_BOUNDS_IF_VALID (cur, minp, maxp, int64_t);
TUNABLE_SET_VAL_IF_VALID_RANGE (cur, val, int64_t);
break;
}
case TUNABLE_TYPE_UINT_64:
{
TUNABLE_SET_BOUNDS_IF_VALID (cur, minp, maxp, uint64_t);
TUNABLE_SET_VAL_IF_VALID_RANGE (cur, val, uint64_t);
break;
}
case TUNABLE_TYPE_SIZE_T:
{
TUNABLE_SET_BOUNDS_IF_VALID (cur, minp, maxp, uint64_t);
TUNABLE_SET_VAL_IF_VALID_RANGE (cur, val, uint64_t);
break;
}
@ -153,15 +190,15 @@ tunable_initialize (tunable_t *cur, const char *strval)
cur->initialized = true;
valp = strval;
}
do_tunable_update_val (cur, valp);
do_tunable_update_val (cur, valp, NULL, NULL);
}
void
__tunable_set_val (tunable_id_t id, void *valp)
__tunable_set_val (tunable_id_t id, void *valp, void *minp, void *maxp)
{
tunable_t *cur = &tunable_list[id];
do_tunable_update_val (cur, valp);
do_tunable_update_val (cur, valp, minp, maxp);
}
#if TUNABLES_FRONTEND == TUNABLES_FRONTEND_valstring