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Add/use adaptive spinning.

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Add spin_t and spin_{init,adaptive}(), which provide a simple
abstraction for adaptive spinning.

Adaptively spin during busy waits in bootstrapping and rtree node
initialization.
This commit is contained in:
Jason Evans 2016-10-13 14:47:50 -07:00
parent a2539fab95
commit 9737685943
6 changed files with 66 additions and 2 deletions
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5
src/jemalloc.c
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@ -1283,10 +1283,13 @@ malloc_init_hard_needed(void)
}
#ifdef JEMALLOC_THREADED_INIT
if (malloc_initializer != NO_INITIALIZER && !IS_INITIALIZER) {
spin_t spinner;
/* Busy-wait until the initializing thread completes. */
spin_init(&spinner);
do {
malloc_mutex_unlock(TSDN_NULL, &init_lock);
CPU_SPINWAIT;
spin_adaptive(&spinner);
malloc_mutex_lock(TSDN_NULL, &init_lock);
} while (!malloc_initialized());
return (false);

5
src/rtree.c
View file

@ -96,12 +96,15 @@ rtree_node_init(rtree_t *rtree, unsigned level, rtree_node_elm_t **elmp)
rtree_node_elm_t *node;
if (atomic_cas_p((void **)elmp, NULL, RTREE_NODE_INITIALIZING)) {
spin_t spinner;
/*
* Another thread is already in the process of initializing.
* Spin-wait until initialization is complete.
*/
spin_init(&spinner);
do {
CPU_SPINWAIT;
spin_adaptive(&spinner);
node = atomic_read_p((void **)elmp);
} while (node == RTREE_NODE_INITIALIZING);
} else {

2
src/spin.c Normal file
View file

@ -0,0 +1,2 @@
#define JEMALLOC_SPIN_C_
#include "jemalloc/internal/jemalloc_internal.h"