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Check for background thread inactivity on extents_dalloc.

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To avoid background threads sleeping forever with idle arenas, we eagerly check
background threads' sleep time after extents_dalloc, and signal the thread if
necessary.
This commit is contained in:
Qi Wang
2017-05-22 15:26:25 -07:00
committed by Qi Wang
parent 2c368284d2
commit 0eae838b0d
4 changed files with 91 additions and 23 deletions
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35
include/jemalloc/internal/background_thread_inlines.h
View File

@@ -18,4 +18,39 @@ arena_background_thread_info_get(arena_t *arena) {
return &background_thread_info[arena_ind % ncpus];
}
JEMALLOC_ALWAYS_INLINE uint64_t
background_thread_wakeup_time_get(background_thread_info_t *info) {
uint64_t next_wakeup = nstime_ns(&info->next_wakeup);
assert(atomic_load_b(&info->indefinite_sleep, ATOMIC_ACQUIRE) ==
(next_wakeup == BACKGROUND_THREAD_INDEFINITE_SLEEP));
return next_wakeup;
}
JEMALLOC_ALWAYS_INLINE void
background_thread_wakeup_time_set(tsdn_t *tsdn, background_thread_info_t *info,
uint64_t wakeup_time) {
malloc_mutex_assert_owner(tsdn, &info->mtx);
atomic_store_b(&info->indefinite_sleep,
wakeup_time == BACKGROUND_THREAD_INDEFINITE_SLEEP, ATOMIC_RELEASE);
nstime_init(&info->next_wakeup, wakeup_time);
}
JEMALLOC_ALWAYS_INLINE bool
background_thread_indefinite_sleep(background_thread_info_t *info) {
return atomic_load_b(&info->indefinite_sleep, ATOMIC_ACQUIRE);
}
JEMALLOC_ALWAYS_INLINE void
arena_background_thread_inactivity_check(tsdn_t *tsdn, arena_t *arena) {
if (!background_thread_enabled()) {
return;
}
background_thread_info_t *info =
arena_background_thread_info_get(arena);
if (background_thread_indefinite_sleep(info)) {
background_thread_interval_check(tsdn, arena,
&arena->decay_dirty, 0);
}
}
#endif /* JEMALLOC_INTERNAL_BACKGROUND_THREAD_INLINES_H */

14
include/jemalloc/internal/background_thread_structs.h
View File

@@ -1,15 +1,22 @@
#ifndef JEMALLOC_INTERNAL_BACKGROUND_THREAD_STRUCTS_H
#define JEMALLOC_INTERNAL_BACKGROUND_THREAD_STRUCTS_H
/* This file really combines "structs" and "types", but only transitionally. */
#define BACKGROUND_THREAD_INDEFINITE_SLEEP UINT64_MAX
struct background_thread_info_s {
malloc_mutex_t mtx;
#ifdef JEMALLOC_BACKGROUND_THREAD
/* Background thread is pthread specific. */
pthread_cond_t cond;
pthread_t thread;
pthread_cond_t cond;
#endif
malloc_mutex_t mtx;
/* Whether the thread has been created. */
bool started;
/* Next scheduled wakeup time (absolute time). */
/* When true, it means no wakeup scheduled. */
atomic_b_t indefinite_sleep;
/* Next scheduled wakeup time (absolute time in ns). */
nstime_t next_wakeup;
/*
* Since the last background thread run, newly added number of pages
@@ -22,7 +29,6 @@ struct background_thread_info_s {
uint64_t tot_n_runs;
/* Stats: total sleep time since started. */
nstime_t tot_sleep_time;
#endif /* ifdef JEMALLOC_BACKGROUND_THREAD */
};
typedef struct background_thread_info_s background_thread_info_t;