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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 9acd5cf178
commit e5effef428
6 changed files with 66 additions and 2 deletions
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4
include/jemalloc/internal/jemalloc_internal.h.in
View File

@@ -346,6 +346,7 @@ typedef unsigned szind_t;
#include "jemalloc/internal/nstime.h"
#include "jemalloc/internal/util.h"
#include "jemalloc/internal/atomic.h"
#include "jemalloc/internal/spin.h"
#include "jemalloc/internal/prng.h"
#include "jemalloc/internal/ticker.h"
#include "jemalloc/internal/ckh.h"
@@ -375,6 +376,7 @@ typedef unsigned szind_t;
#include "jemalloc/internal/nstime.h"
#include "jemalloc/internal/util.h"
#include "jemalloc/internal/atomic.h"
#include "jemalloc/internal/spin.h"
#include "jemalloc/internal/prng.h"
#include "jemalloc/internal/ticker.h"
#include "jemalloc/internal/ckh.h"
@@ -465,6 +467,7 @@ void jemalloc_postfork_child(void);
#include "jemalloc/internal/nstime.h"
#include "jemalloc/internal/util.h"
#include "jemalloc/internal/atomic.h"
#include "jemalloc/internal/spin.h"
#include "jemalloc/internal/prng.h"
#include "jemalloc/internal/ticker.h"
#include "jemalloc/internal/ckh.h"
@@ -494,6 +497,7 @@ void jemalloc_postfork_child(void);
#include "jemalloc/internal/nstime.h"
#include "jemalloc/internal/util.h"
#include "jemalloc/internal/atomic.h"
#include "jemalloc/internal/spin.h"
#include "jemalloc/internal/prng.h"
#include "jemalloc/internal/ticker.h"
#include "jemalloc/internal/ckh.h"

51
include/jemalloc/internal/spin.h Normal file
View File

@@ -0,0 +1,51 @@
/******************************************************************************/
#ifdef JEMALLOC_H_TYPES
typedef struct spin_s spin_t;
#endif /* JEMALLOC_H_TYPES */
/******************************************************************************/
#ifdef JEMALLOC_H_STRUCTS
struct spin_s {
unsigned iteration;
};
#endif /* JEMALLOC_H_STRUCTS */
/******************************************************************************/
#ifdef JEMALLOC_H_EXTERNS
#endif /* JEMALLOC_H_EXTERNS */
/******************************************************************************/
#ifdef JEMALLOC_H_INLINES
#ifndef JEMALLOC_ENABLE_INLINE
void spin_init(spin_t *spin);
void spin_adaptive(spin_t *spin);
#endif
#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_SPIN_C_))
JEMALLOC_INLINE void
spin_init(spin_t *spin)
{
spin->iteration = 0;
}
JEMALLOC_INLINE void
spin_adaptive(spin_t *spin)
{
volatile uint64_t i;
for (i = 0; i < (KQU(1) << spin->iteration); i++)
CPU_SPINWAIT;
if (spin->iteration < 63)
spin->iteration++;
}
#endif
#endif /* JEMALLOC_H_INLINES */
/******************************************************************************/