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server-skynet-source-3rd-je.../include/jemalloc/internal/background_thread_structs.h

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Implementing opt.background_thread. Added opt.background_thread to enable background threads, which handles purging currently. When enabled, decay ticks will not trigger purging (which will be left to the background threads). We limit the max number of threads to NCPUs. When percpu arena is enabled, set CPU affinity for the background threads as well. The sleep interval of background threads is dynamic and determined by computing number of pages to purge in the future (based on backlog).
2017-03-18 03:42:33 +08:00
#ifndef JEMALLOC_INTERNAL_BACKGROUND_THREAD_STRUCTS_H
#define JEMALLOC_INTERNAL_BACKGROUND_THREAD_STRUCTS_H
Check for background thread inactivity on extents_dalloc. 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.
2017-05-23 06:26:25 +08:00
/* This file really combines "structs" and "types", but only transitionally. */
Refactor/fix background_thread/percpu_arena bootstrapping. Refactor bootstrapping such that dlsym() is called during the bootstrapping phase that can tolerate reentrant allocation.
2017-06-01 07:45:14 +08:00
#if defined(JEMALLOC_BACKGROUND_THREAD) || defined(JEMALLOC_LAZY_LOCK)
# define JEMALLOC_PTHREAD_CREATE_WRAPPER
#endif
Check for background thread inactivity on extents_dalloc. 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.
2017-05-23 06:26:25 +08:00
#define BACKGROUND_THREAD_INDEFINITE_SLEEP UINT64_MAX
background_thread: add max thread count config Looking at the thread counts in our services, jemalloc's background thread is useful, but mostly idle. Add a config option to tune down the number of threads.
2018-03-30 03:58:13 +08:00
#define MAX_BACKGROUND_THREAD_LIMIT MALLOCX_ARENA_LIMIT
Set the default number of background threads to 4. The setting has been tested in production for a while. No negative effect while we were able to reduce number of threads per process.
2018-11-16 05:01:05 +08:00
#define DEFAULT_NUM_BACKGROUND_THREAD 4
Check for background thread inactivity on extents_dalloc. 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.
2017-05-23 06:26:25 +08:00
Combine background_thread started / paused into state.
2017-06-10 06:45:25 +08:00
typedef enum {
background_thread_stopped,
background_thread_started,
/* Thread waits on the global lock when paused (for arena_reset). */
background_thread_paused,
} background_thread_state_t;
Implementing opt.background_thread. Added opt.background_thread to enable background threads, which handles purging currently. When enabled, decay ticks will not trigger purging (which will be left to the background threads). We limit the max number of threads to NCPUs. When percpu arena is enabled, set CPU affinity for the background threads as well. The sleep interval of background threads is dynamic and determined by computing number of pages to purge in the future (based on backlog).
2017-03-18 03:42:33 +08:00
struct background_thread_info_s {
#ifdef JEMALLOC_BACKGROUND_THREAD
/* Background thread is pthread specific. */
pthread_t thread;
Check for background thread inactivity on extents_dalloc. 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.
2017-05-23 06:26:25 +08:00
pthread_cond_t cond;
#endif
malloc_mutex_t mtx;
Combine background_thread started / paused into state.
2017-06-10 06:45:25 +08:00
background_thread_state_t state;
Check for background thread inactivity on extents_dalloc. 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.
2017-05-23 06:26:25 +08:00
/* When true, it means no wakeup scheduled. */
atomic_b_t indefinite_sleep;
/* Next scheduled wakeup time (absolute time in ns). */
Implementing opt.background_thread. Added opt.background_thread to enable background threads, which handles purging currently. When enabled, decay ticks will not trigger purging (which will be left to the background threads). We limit the max number of threads to NCPUs. When percpu arena is enabled, set CPU affinity for the background threads as well. The sleep interval of background threads is dynamic and determined by computing number of pages to purge in the future (based on backlog).
2017-03-18 03:42:33 +08:00
nstime_t next_wakeup;
/*
* Since the last background thread run, newly added number of pages
* that need to be purged by the next wakeup. This is adjusted on
* epoch advance, and is used to determine whether we should signal the
* background thread to wake up earlier.
*/
size_t npages_to_purge_new;
Add background thread related stats.
2017-05-13 03:30:33 +08:00
/* Stats: total number of runs since started. */
uint64_t tot_n_runs;
/* Stats: total sleep time since started. */
nstime_t tot_sleep_time;
Implementing opt.background_thread. Added opt.background_thread to enable background threads, which handles purging currently. When enabled, decay ticks will not trigger purging (which will be left to the background threads). We limit the max number of threads to NCPUs. When percpu arena is enabled, set CPU affinity for the background threads as well. The sleep interval of background threads is dynamic and determined by computing number of pages to purge in the future (based on backlog).
2017-03-18 03:42:33 +08:00
};
typedef struct background_thread_info_s background_thread_info_t;
Add background thread related stats.
2017-05-13 03:30:33 +08:00
struct background_thread_stats_s {
size_t num_threads;
uint64_t num_runs;
nstime_t run_interval;
};
typedef struct background_thread_stats_s background_thread_stats_t;
Implementing opt.background_thread. Added opt.background_thread to enable background threads, which handles purging currently. When enabled, decay ticks will not trigger purging (which will be left to the background threads). We limit the max number of threads to NCPUs. When percpu arena is enabled, set CPU affinity for the background threads as well. The sleep interval of background threads is dynamic and determined by computing number of pages to purge in the future (based on backlog).
2017-03-18 03:42:33 +08:00
#endif /* JEMALLOC_INTERNAL_BACKGROUND_THREAD_STRUCTS_H */
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