mirror of
https://github.com/jemalloc/jemalloc.git
synced 2026-07-22 04:03:11 +00:00
609ae595f0
Add the "arenas.extend" mallctl, so that it is possible to create new
arenas that are outside the set that jemalloc automatically multiplexes
threads onto.
Add the ALLOCM_ARENA() flag for {,r,d}allocm(), so that it is possible
to explicitly allocate from a particular arena.
Add the "opt.dss" mallctl, which controls the default precedence of dss
allocation relative to mmap allocation.
Add the "arena.<i>.dss" mallctl, which makes it possible to set the
default dss precedence on a per arena or global basis.
Add the "arena.<i>.purge" mallctl, which obsoletes "arenas.purge".
Add the "stats.arenas.<i>.dss" mallctl.
140 lines
2.7 KiB
C
140 lines
2.7 KiB
C
#define JEMALLOC_BASE_C_
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#include "jemalloc/internal/jemalloc_internal.h"
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/******************************************************************************/
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/* Data. */
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static malloc_mutex_t base_mtx;
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/*
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* Current pages that are being used for internal memory allocations. These
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* pages are carved up in cacheline-size quanta, so that there is no chance of
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* false cache line sharing.
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*/
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static void *base_pages;
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static void *base_next_addr;
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static void *base_past_addr; /* Addr immediately past base_pages. */
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static extent_node_t *base_nodes;
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/******************************************************************************/
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/* Function prototypes for non-inline static functions. */
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static bool base_pages_alloc(size_t minsize);
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/******************************************************************************/
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static bool
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base_pages_alloc(size_t minsize)
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{
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size_t csize;
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bool zero;
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assert(minsize != 0);
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csize = CHUNK_CEILING(minsize);
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zero = false;
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base_pages = chunk_alloc(csize, chunksize, true, &zero,
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chunk_dss_prec_get());
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if (base_pages == NULL)
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return (true);
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base_next_addr = base_pages;
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base_past_addr = (void *)((uintptr_t)base_pages + csize);
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return (false);
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}
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void *
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base_alloc(size_t size)
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{
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void *ret;
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size_t csize;
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/* Round size up to nearest multiple of the cacheline size. */
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csize = CACHELINE_CEILING(size);
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malloc_mutex_lock(&base_mtx);
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/* Make sure there's enough space for the allocation. */
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if ((uintptr_t)base_next_addr + csize > (uintptr_t)base_past_addr) {
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if (base_pages_alloc(csize)) {
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malloc_mutex_unlock(&base_mtx);
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return (NULL);
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}
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}
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/* Allocate. */
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ret = base_next_addr;
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base_next_addr = (void *)((uintptr_t)base_next_addr + csize);
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malloc_mutex_unlock(&base_mtx);
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return (ret);
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}
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void *
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base_calloc(size_t number, size_t size)
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{
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void *ret = base_alloc(number * size);
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if (ret != NULL)
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memset(ret, 0, number * size);
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return (ret);
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}
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extent_node_t *
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base_node_alloc(void)
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{
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extent_node_t *ret;
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malloc_mutex_lock(&base_mtx);
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if (base_nodes != NULL) {
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ret = base_nodes;
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base_nodes = *(extent_node_t **)ret;
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malloc_mutex_unlock(&base_mtx);
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} else {
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malloc_mutex_unlock(&base_mtx);
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ret = (extent_node_t *)base_alloc(sizeof(extent_node_t));
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}
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return (ret);
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}
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void
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base_node_dealloc(extent_node_t *node)
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{
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malloc_mutex_lock(&base_mtx);
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*(extent_node_t **)node = base_nodes;
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base_nodes = node;
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malloc_mutex_unlock(&base_mtx);
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}
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bool
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base_boot(void)
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{
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base_nodes = NULL;
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if (malloc_mutex_init(&base_mtx))
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return (true);
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return (false);
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}
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void
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base_prefork(void)
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{
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malloc_mutex_prefork(&base_mtx);
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}
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void
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base_postfork_parent(void)
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{
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malloc_mutex_postfork_parent(&base_mtx);
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}
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void
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base_postfork_child(void)
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{
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malloc_mutex_postfork_child(&base_mtx);
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}
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