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Add arena.i.retain_grow_limit

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This option controls the max size when grow_retained.  This is useful when we
have customized extent hooks reserving physical memory (e.g. 1G huge pages).
Without this feature, the default increasing sequence could result in fragmented
and wasted physical memory.
This commit is contained in:
Qi Wang 2017-11-02 17:48:39 -07:00 • committed by Qi Wang
parent 9f455e2786
commit e422fa8e7e
8 changed files with 146 additions and 5 deletions
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28
src/arena.c
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@ -1886,6 +1886,33 @@ arena_muzzy_decay_ms_default_set(ssize_t decay_ms) {
return false;
}
bool
arena_retain_grow_limit_get_set(tsd_t *tsd, arena_t *arena, size_t *old_limit,
size_t *new_limit) {
assert(opt_retain);
pszind_t new_ind JEMALLOC_CC_SILENCE_INIT(0);
if (new_limit != NULL) {
size_t limit = *new_limit;
/* Grow no more than the new limit. */
if ((new_ind = sz_psz2ind(limit + 1) - 1) >
EXTENT_GROW_MAX_PIND) {
return true;
}
}
malloc_mutex_lock(tsd_tsdn(tsd), &arena->extent_grow_mtx);
if (old_limit != NULL) {
*old_limit = sz_pind2sz(arena->retain_grow_limit);
}
if (new_limit != NULL) {
arena->retain_grow_limit = new_ind;
}
malloc_mutex_unlock(tsd_tsdn(tsd), &arena->extent_grow_mtx);
return false;
}
unsigned
arena_nthreads_get(arena_t *arena, bool internal) {
return atomic_load_u(&arena->nthreads[internal], ATOMIC_RELAXED);
@ -2013,6 +2040,7 @@ arena_new(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
}
arena->extent_grow_next = sz_psz2ind(HUGEPAGE);
arena->retain_grow_limit = EXTENT_GROW_MAX_PIND;
if (malloc_mutex_init(&arena->extent_grow_mtx, "extent_grow",
WITNESS_RANK_EXTENT_GROW, malloc_mutex_rank_exclusive)) {
goto label_error;