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Implementing opt.background_thread.

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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).
This commit is contained in:
Qi Wang 2017-03-17 12:42:33 -07:00 • committed by Qi Wang
parent 3f685e8824
commit b693c7868e
23 changed files with 1245 additions and 348 deletions
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19
src/mutex.c
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@ -5,10 +5,6 @@
#include "jemalloc/internal/assert.h"
#include "jemalloc/internal/malloc_io.h"
#if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32)
#include <dlfcn.h>
#endif
#ifndef _CRT_SPINCOUNT
#define _CRT_SPINCOUNT 4000
#endif
@ -24,10 +20,6 @@ static bool postpone_init = true;
static malloc_mutex_t *postponed_mutexes = NULL;
#endif
#if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32)
static void pthread_create_once(void);
#endif
/******************************************************************************/
/*
* We intercept pthread_create() calls in order to toggle isthreaded if the
@ -35,18 +27,9 @@ static void pthread_create_once(void);
*/
#if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32)
static int (*pthread_create_fptr)(pthread_t *__restrict, const pthread_attr_t *,
void *(*)(void *), void *__restrict);
static void
pthread_create_once(void) {
pthread_create_fptr = dlsym(RTLD_NEXT, "pthread_create");
if (pthread_create_fptr == NULL) {
malloc_write("<jemalloc>: Error in dlsym(RTLD_NEXT, "
"\"pthread_create\")\n");
abort();
}
pthread_create_fptr = load_pthread_create_fptr();
isthreaded = true;
}