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View slabs_preallocate@slabs.c
static void slabs_preallocate (const unsigned int maxslabs) {
int i;
unsigned int prealloc = 0;
/* pre-allocate a 1MB slab in every size class so people don't get
confused by non-intuitive "SERVER_ERROR out of memory"
messages. this is the most common question on the mailing
list. if you really don't want this, you can rebuild without
these three lines. */
View slabs_init@slabs.c
void slabs_init(const size_t limit, const double factor, const bool prealloc, const uint32_t *slab_sizes) {
...
if (prealloc) {
slabs_preallocate(power_largest);
}
}
View do_slabs_free@slabs.c
static void do_slabs_free(void *ptr, const size_t size, unsigned int id) {
slabclass_t *p;
item *it;
...
p = &slabclass[id];
it = (item *)ptr;
it->it_flags = ITEM_SLABBED; // scr: ---------------> 1)
it->slabs_clsid = 0;
it->prev = 0; // scr: ------------------------------> 2)
View split_slab_page_into_freelist@slabs.c
static void split_slab_page_into_freelist(char *ptr, const unsigned int id) {
slabclass_t *p = &slabclass[id];
int x;
for (x = 0; x < p->perslab; x++) {
do_slabs_free(ptr, 0, id);
ptr += p->size;
}
}
View grow_slab_list@slabs.c
static int grow_slab_list (const unsigned int id) {
slabclass_t *p = &slabclass[id];
if (p->slabs == p->list_size) {
size_t new_size = (p->list_size != 0) ? p->list_size * 2 : 16;
void *new_list = realloc(p->slab_list, new_size * sizeof(void *));
if (new_list == 0) return 0;
p->list_size = new_size;
p->slab_list = new_list;
}
return 1;
View slabs_init@slabs.c
static int do_slabs_newslab(const unsigned int id) {
slabclass_t *p = &slabclass[id]; // scr: ----------------------------> 1)
slabclass_t *g = &slabclass[SLAB_GLOBAL_PAGE_POOL]; // scr: ---------> *)
int len = settings.slab_reassign ? settings.item_size_max // scr: ---> 2)
: p->size * p->perslab;
char *ptr;
if ((mem_limit && mem_malloced + len > mem_limit && p->slabs > 0 // -> 3)
&& g->slabs == 0)) {
mem_limit_reached = true;
View preallocate@memcached.c
...
bool preallocate = false;
...
case 'L' :
if (enable_large_pages() == 0) {
preallocate = true;
} else {
fprintf(stderr, "Cannot enable large pages on this system\n"
"(There is no Linux support as of this version)\n");
return 1;
View settings.maxbytes@memcached.c
static size_t mem_limit = 0;
...
settings.maxbytes = 64 * 1024 * 1024; /* default is 64MB */
...
case 'm':
settings.maxbytes = ((size_t)atoi(optarg)) * 1024 * 1024;
break;
...
View slabs_init@memcached.c
void slabs_init(const size_t limit, const double factor, const bool prealloc, const uint32_t *slab_sizes) {
...
mem_limit = limit; // scr: here
...
View slabclass_t@slabs.c
typedef struct {
unsigned int size; /* sizes of items */
unsigned int perslab; /* how many items per slab */
void *slots; /* list of item ptrs */
unsigned int sl_curr; /* total free items in list */
unsigned int slabs; /* how many slabs were allocated for this class */
void **slab_list; /* array of slab pointers */