server-skynet-source-3rd-jemalloc/src/ehooks.c

#include "jemalloc/internal/jemalloc_preamble.h"
#include "jemalloc/internal/jemalloc_internal_includes.h"

#include "jemalloc/internal/ehooks.h"
#include "jemalloc/internal/extent_mmap.h"

void ehooks_init(ehooks_t *ehooks, extent_hooks_t *extent_hooks) {
	ehooks_set_extent_hooks_ptr(ehooks, extent_hooks);
}

/*
 * If the caller specifies (!*zero), it is still possible to receive zeroed
 * memory, in which case *zero is toggled to true.  arena_extent_alloc() takes
 * advantage of this to avoid demanding zeroed extents, but taking advantage of
 * them if they are returned.
 */
static void *
extent_alloc_core(tsdn_t *tsdn, arena_t *arena, void *new_addr, size_t size,
    size_t alignment, bool *zero, bool *commit, dss_prec_t dss_prec) {
	void *ret;

	assert(size != 0);
	assert(alignment != 0);

	/* "primary" dss. */
	if (have_dss && dss_prec == dss_prec_primary && (ret =
	    extent_alloc_dss(tsdn, arena, new_addr, size, alignment, zero,
	    commit)) != NULL) {
		return ret;
	}
	/* mmap. */
	if ((ret = extent_alloc_mmap(new_addr, size, alignment, zero, commit))
	    != NULL) {
		return ret;
	}
	/* "secondary" dss. */
	if (have_dss && dss_prec == dss_prec_secondary && (ret =
	    extent_alloc_dss(tsdn, arena, new_addr, size, alignment, zero,
	    commit)) != NULL) {
		return ret;
	}

	/* All strategies for allocation failed. */
	return NULL;
}

void *
ehooks_default_alloc_impl(tsdn_t *tsdn, void *new_addr, size_t size,
    size_t alignment, bool *zero, bool *commit, unsigned arena_ind) {
	arena_t *arena = arena_get(tsdn, arena_ind, false);
	void *ret = extent_alloc_core(tsdn, arena, new_addr, size, alignment, zero,
	    commit, (dss_prec_t)atomic_load_u(&arena->dss_prec,
	    ATOMIC_RELAXED));
	if (have_madvise_huge && ret) {
		pages_set_thp_state(ret, size);
	}
	return ret;
}

void *
ehooks_default_alloc(extent_hooks_t *extent_hooks, void *new_addr, size_t size,
    size_t alignment, bool *zero, bool *commit, unsigned arena_ind) {
	tsdn_t *tsdn;
	arena_t *arena;

	tsdn = tsdn_fetch();
	arena = arena_get(tsdn, arena_ind, false);
	/*
	 * The arena we're allocating on behalf of must have been initialized
	 * already.
	 */
	assert(arena != NULL);

	return ehooks_default_alloc_impl(tsdn, new_addr, size,
	    ALIGNMENT_CEILING(alignment, PAGE), zero, commit,
	    arena_ind_get(arena));
}