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#include "jemalloc/internal/jemalloc_preamble.h"
#include "jemalloc/internal/jemalloc_internal_includes.h"
#include "jemalloc/internal/thread_event.h"
#include "jemalloc/internal/thread_event_registry.h"
#include "jemalloc/internal/tcache_externs.h"
#include "jemalloc/internal/peak_event.h"
#include "jemalloc/internal/prof_externs.h"
#include "jemalloc/internal/stats.h"
static malloc_mutex_t uevents_mu;
bool
experimental_thread_events_boot(void) {
return malloc_mutex_init(&uevents_mu, "thread_events",
WITNESS_RANK_THREAD_EVENTS_USER, malloc_mutex_rank_exclusive);
}
#define TE_REGISTER_ERRCODE_FULL_SLOTS -1
#define TE_REGISTER_ERRCODE_ALREADY_REGISTERED -2
static user_hook_object_t uevents_storage[TE_MAX_USER_EVENTS] = {
{NULL, 0, false},
};
static atomic_p_t uevent_obj_p[TE_MAX_USER_EVENTS] = {
NULL,
};
static inline bool
user_object_eq(user_hook_object_t *lhs, user_hook_object_t *rhs) {
assert(lhs != NULL && rhs != NULL);
return lhs->callback == rhs->callback && lhs->interval == rhs->interval
&& lhs->is_alloc_only == rhs->is_alloc_only;
}
/*
* Return slot number that event is registered at on success
* it will be [0, TE_MAX_USER_EVENTS)
* Return negative value on some error
*/
static inline int
te_register_user_handler_locked(user_hook_object_t *new_obj) {
/* Attempt to find the free slot in global register */
for (int i = 0; i < TE_MAX_USER_EVENTS; ++i) {
user_hook_object_t *p = (user_hook_object_t *)atomic_load_p(
&uevent_obj_p[i], ATOMIC_ACQUIRE);
if (p && user_object_eq(p, new_obj)) {
/* Same callback and interval are registered - no error. */
return TE_REGISTER_ERRCODE_ALREADY_REGISTERED;
} else if (p == NULL) {
/* Empty slot */
uevents_storage[i] = *new_obj;
atomic_fence(ATOMIC_SEQ_CST);
atomic_store_p(&uevent_obj_p[i], &uevents_storage[i],
ATOMIC_RELEASE);
return i;
}
}
return TE_REGISTER_ERRCODE_FULL_SLOTS;
}
static inline user_hook_object_t *
uobj_get(size_t cb_idx) {
assert(cb_idx < TE_MAX_USER_EVENTS);
return (user_hook_object_t *)atomic_load_p(
&uevent_obj_p[cb_idx], ATOMIC_ACQUIRE);
}
te_enabled_t
te_user_event_enabled(size_t ue_idx, bool is_alloc) {
assert(ue_idx < TE_MAX_USER_EVENTS);
user_hook_object_t *obj = uobj_get(ue_idx);
if (!obj) {
return te_enabled_not_installed;
}
if (is_alloc || !obj->is_alloc_only) {
return te_enabled_yes;
}
return te_enabled_no;
}
static inline uint64_t
new_event_wait(size_t cb_idx) {
user_hook_object_t *obj = uobj_get(cb_idx);
/* Enabled should have guarded it */
assert(obj);
return obj->interval;
}
static uint64_t
postponed_event_wait(tsd_t *tsd) {
return TE_MIN_START_WAIT;
}
static inline void
handler_wrapper(tsd_t *tsd, bool is_alloc, size_t cb_idx) {
user_hook_object_t *obj = uobj_get(cb_idx);
/* Enabled should have guarded it */
assert(obj);
uint64_t alloc = tsd_thread_allocated_get(tsd);
uint64_t dalloc = tsd_thread_deallocated_get(tsd);
pre_reentrancy(tsd, NULL);
obj->callback(is_alloc, alloc, dalloc);
post_reentrancy(tsd);
}
#define TE_USER_HANDLER_BINDING_IDX(i) \
static te_enabled_t te_user_alloc_enabled##i(void) { \
return te_user_event_enabled(i, true); \
} \
static te_enabled_t te_user_dalloc_enabled##i(void) { \
return te_user_event_enabled(i, false); \
} \
static uint64_t te_user_new_event_wait_##i(tsd_t *tsd) { \
return new_event_wait(i); \
} \
static void te_user_alloc_handler_call##i(tsd_t *tsd) { \
handler_wrapper(tsd, true, i); \
} \
static void te_user_dalloc_handler_call##i(tsd_t *tsd) { \
handler_wrapper(tsd, false, i); \
} \
static te_base_cb_t user_alloc_handler##i = { \
.enabled = &te_user_alloc_enabled##i, \
.new_event_wait = &te_user_new_event_wait_##i, \
.postponed_event_wait = &postponed_event_wait, \
.event_handler = &te_user_alloc_handler_call##i}; \
static te_base_cb_t user_dalloc_handler##i = { \
.enabled = &te_user_dalloc_enabled##i, \
.new_event_wait = &te_user_new_event_wait_##i, \
.postponed_event_wait = &postponed_event_wait, \
.event_handler = &te_user_dalloc_handler_call##i}
TE_USER_HANDLER_BINDING_IDX(0);
TE_USER_HANDLER_BINDING_IDX(1);
TE_USER_HANDLER_BINDING_IDX(2);
TE_USER_HANDLER_BINDING_IDX(3);
/* Table of all the thread events. */
te_base_cb_t *te_alloc_handlers[te_alloc_count] = {
#ifdef JEMALLOC_PROF
&prof_sample_te_handler,
#endif
&stats_interval_te_handler, &tcache_gc_te_handler,
#ifdef JEMALLOC_STATS
&peak_te_handler,
#endif
&user_alloc_handler0, &user_alloc_handler1, &user_alloc_handler2,
&user_alloc_handler3};
te_base_cb_t *te_dalloc_handlers[te_dalloc_count] = {&tcache_gc_te_handler,
#ifdef JEMALLOC_STATS
&peak_te_handler,
#endif
&user_dalloc_handler0, &user_dalloc_handler1, &user_dalloc_handler2,
&user_dalloc_handler3};
static inline bool
te_update_tsd(tsd_t *tsd, uint64_t new_wait, size_t ue_idx, bool is_alloc) {
bool needs_recompute = false;
te_ctx_t ctx;
uint64_t next, current, cur_wait;
if (is_alloc) {
tsd_te_datap_get_unsafe(tsd)
->alloc_wait[te_alloc_user0 + ue_idx] = new_wait;
} else {
tsd_te_datap_get_unsafe(tsd)
->dalloc_wait[te_dalloc_user0 + ue_idx] = new_wait;
}
te_ctx_get(tsd, &ctx, is_alloc);
next = te_ctx_next_event_get(&ctx);
current = te_ctx_current_bytes_get(&ctx);
cur_wait = next - current;
if (new_wait < cur_wait) {
/*
* Set last event to current (same as when te inits). This
* will make sure that all the invariants are correct, before
* we adjust next_event and next_event fast.
*/
te_ctx_last_event_set(&ctx, te_ctx_current_bytes_get(&ctx));
te_adjust_thresholds_helper(tsd, &ctx, new_wait);
needs_recompute = true;
}
return needs_recompute;
}
static inline void
te_recalculate_current_thread_data(tsdn_t *tsdn, int ue_idx, bool alloc_only) {
bool recompute = false;
/* we do not need lock to recalculate the events on the current thread */
assert(ue_idx < TE_MAX_USER_EVENTS);
tsd_t *tsd = tsdn_null(tsdn) ? tsd_fetch() : tsdn_tsd(tsdn);
if (tsd) {
uint64_t new_wait = new_event_wait(ue_idx);
recompute = te_update_tsd(tsd, new_wait, ue_idx, true);
if (!alloc_only) {
recompute = te_update_tsd(tsd, new_wait, ue_idx, false)
|| recompute;
}
if (recompute) {
te_recompute_fast_threshold(tsd);
}
}
}
int
te_register_user_handler(tsdn_t *tsdn, user_hook_object_t *te_uobj) {
int ret;
int reg_retcode;
if (!te_uobj || !te_uobj->callback || te_uobj->interval == 0) {
return EINVAL;
}
malloc_mutex_lock(tsdn, &uevents_mu);
reg_retcode = te_register_user_handler_locked(te_uobj);
malloc_mutex_unlock(tsdn, &uevents_mu);
if (reg_retcode >= 0) {
te_recalculate_current_thread_data(
tsdn, reg_retcode, te_uobj->is_alloc_only);
ret = 0;
} else if (reg_retcode == TE_REGISTER_ERRCODE_ALREADY_REGISTERED) {
ret = 0;
} else {
ret = EINVAL;
}
return ret;
}
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