/**
* on-demand memory fragmentation, based on an input pattern file
*/
int hp_mem_warming(struct hp_block *hpb)
{
struct size_fraction {
int hash_index;
double amount;
unsigned long fragments;
struct size_fraction *next;
};
struct size_fraction *sf, *it, *sorted_sf = NULL;
FILE *f;
size_t rc;
unsigned long roundto, hash_size;
long long bucket_mem;
int i, c = 0;
unsigned int current_frag_size;
struct hp_frag *big_frag;
unsigned int optimized_buckets;
f = fopen(mem_warming_pattern_file, "r");
if (!f) {
LM_ERR("failed to open pattern file %s: %d - %s\n",
mem_warming_pattern_file, errno, strerror(errno));
return -1;
}
rc = fscanf(f, "%lu %lu\n", &roundto, &hash_size);
if (rc != 2) {
LM_ERR("failed to read from %s: bad file format\n",
mem_warming_pattern_file);
goto out;
}
rc = 0;
if (roundto != ROUNDTO || hash_size != HP_HASH_SIZE) {
LM_ERR("incompatible pattern file data: [HP_HASH_SIZE: %lu-%lu] "
"[ROUNDTO: %lu-%lu]\n", hash_size, HP_HASH_SIZE, roundto, ROUNDTO);
rc = -1;
goto out;
}
/* read bucket usage percentages and sort them by number of fragments */
for (i = 0; i < HP_LINEAR_HASH_SIZE; i++) {
sf = malloc(sizeof *sf);
if (!sf) {
LM_INFO("malloc failed, skipping shm warming\n");
rc = -1;
goto out_free;
}
sf->hash_index = i;
sf->next = NULL;
if (fscanf(f, "%lf", &sf->amount) != 1) {
LM_CRIT("%s appears to be corrupt. Please remove it first\n",
mem_warming_pattern_file);
abort();
}
if (i == 0)
sf->fragments = 0;
else
sf->fragments = sf->amount * hpb->size / (ROUNDTO * i);
if (!sorted_sf)
sorted_sf = sf;
else {
for (it = sorted_sf;
it->next && it->next->fragments > sf->fragments;
it = it->next)
;
if (it->fragments < sf->fragments) {
sf->next = sorted_sf;
sorted_sf = sf;
} else {
sf->next = it->next;
it->next = sf;
}
}
}
/* only optimize the configured number of buckets */
optimized_buckets = (float)shm_hash_split_percentage / 100 * HP_LINEAR_HASH_SIZE;
LM_INFO("Optimizing %u / %lu mem buckets\n", optimized_buckets,
HP_LINEAR_HASH_SIZE);
sf = sorted_sf;
for (i = 0; i < optimized_buckets; i++) {
hpb->free_hash[sf->hash_index].is_optimized = 1;
sf = sf->next;
}
big_frag = hpb->first_frag;
/* populate each free hash bucket with proper number of fragments */
for (sf = sorted_sf; sf; sf = sf->next) {
LM_INFO("[%d][%s] fraction: %.12lf total mem: %llu, %lu\n", sf->hash_index,
hpb->free_hash[sf->hash_index].is_optimized ? "X" : " ",
sf->amount, (unsigned long long) (sf->amount *
hpb->size * mem_warming_percentage / 100),
ROUNDTO * sf->hash_index);
current_frag_size = ROUNDTO * sf->hash_index;
bucket_mem = sf->amount * hpb->size * mem_warming_percentage / 100;
/* create free fragments worth of 'bucket_mem' memory */
while (bucket_mem >= FRAG_OVERHEAD + current_frag_size) {
hp_frag_detach(hpb, big_frag);
if (stats_are_ready())
update_stats_shm_frag_detach(big_frag);
else {
hpb->used += big_frag->size;
hpb->real_used += big_frag->size + FRAG_OVERHEAD;
}
/* trim-insert operation on the big free fragment */
shm_frag_split_unsafe(hpb, big_frag, current_frag_size);
/*
* "big_frag" now points to a smaller, free and detached frag.
*
* With optimized buckets, inserts will be automagically
* balanced within their dedicated hashes
*/
hp_frag_attach(hpb, big_frag);
if (stats_are_ready())
update_stats_shm_frag_attach(big_frag);
else {
hpb->used -= big_frag->size;
hpb->real_used -= big_frag->size + FRAG_OVERHEAD;
}
big_frag = FRAG_NEXT(big_frag);
bucket_mem -= FRAG_OVERHEAD + current_frag_size;
if (c % 1000000 == 0)
LM_INFO("%d| %lld %p\n", c, bucket_mem, big_frag);
c++;
}
}
out_free:
while (sorted_sf) {
sf = sorted_sf;
sorted_sf = sorted_sf->next;
free(sf);
}
out:
fclose(f);
return rc;
}
/*
* Note: as opposed to hp_shm_malloc_unsafe(),
* hp_shm_malloc() assumes that the core statistics are initialized
*/
void *hp_shm_malloc(struct hp_block *hpb, unsigned long size)
{
struct hp_frag *frag;
unsigned int init_hash, hash, sec_hash;
int i;
/* size must be a multiple of ROUNDTO */
size = ROUNDUP(size);
/*search for a suitable free frag*/
for (hash = GET_HASH(size), init_hash = hash; hash < HP_HASH_SIZE; hash++) {
if (!hpb->free_hash[hash].is_optimized) {
SHM_LOCK(hash);
frag = hpb->free_hash[hash].first;
for (; frag; frag = frag->u.nxt_free)
if (frag->size >= size)
goto found;
SHM_UNLOCK(hash);
} else {
/* optimized size. search through its own hash! */
for (i = 0, sec_hash = HP_HASH_SIZE +
hash * shm_secondary_hash_size +
optimized_get_indexes[hash];
i < shm_secondary_hash_size;
i++, sec_hash = (sec_hash + 1) % shm_secondary_hash_size) {
SHM_LOCK(sec_hash);
frag = hpb->free_hash[sec_hash].first;
for (; frag; frag = frag->u.nxt_free)
if (frag->size >= size) {
/* free fragments are detached in a simple round-robin manner */
optimized_get_indexes[hash] =
(optimized_get_indexes[hash] + i + 1)
% shm_secondary_hash_size;
hash = sec_hash;
goto found;
}
SHM_UNLOCK(sec_hash);
}
}
/* try in a bigger bucket */
}
/* out of memory... we have to shut down */
LM_CRIT("not enough shared memory, please increase the \"-m\" parameter!\n");
abort();
found:
hp_frag_detach(hpb, frag);
/* split the fragment if possible */
shm_frag_split(hpb, frag, size, hash);
SHM_UNLOCK(hash);
update_stats_shm_frag_detach(frag);
#ifndef HP_MALLOC_FAST_STATS
unsigned long real_used;
real_used = get_stat_val(shm_rused);
if (real_used > hpb->max_real_used)
hpb->max_real_used = real_used;
#endif
/* ignore concurrency issues, simply obtaining an estimate is enough */
mem_hash_usage[init_hash]++;
return (char *)frag + sizeof *frag;
}
/*
* although there is a lot of duplicate code, we get the best performance:
*
* - the _unsafe version will not be used too much anyway (usually at startup)
* - hp_shm_malloc is faster (no 3rd parameter, no extra if blocks)
*/
void *hp_shm_malloc_unsafe(struct hp_block *qm, unsigned long size)
{
struct hp_frag *frag;
unsigned int init_hash, hash, sec_hash;
int i;
/* size must be a multiple of ROUNDTO */
size = ROUNDUP(size);
/*search for a suitable free frag*/
for (hash = GET_HASH(size), init_hash = hash; hash < HP_HASH_SIZE; hash++) {
if (!qm->free_hash[hash].is_optimized) {
frag = qm->free_hash[hash].first;
for (; frag; frag = frag->u.nxt_free)
if (frag->size >= size)
goto found;
} else {
/* optimized size. search through its own hash! */
for (i = 0, sec_hash = HP_HASH_SIZE +
hash * shm_secondary_hash_size +
optimized_get_indexes[hash];
i < shm_secondary_hash_size;
i++, sec_hash = (sec_hash + 1) % shm_secondary_hash_size) {
frag = qm->free_hash[sec_hash].first;
for (; frag; frag = frag->u.nxt_free)
if (frag->size >= size) {
/* free fragments are detached in a simple round-robin manner */
optimized_get_indexes[hash] =
(optimized_get_indexes[hash] + i + 1)
% shm_secondary_hash_size;
hash = sec_hash;
goto found;
}
}
}
/* try in a bigger bucket */
}
/* out of memory... we have to shut down */
LM_CRIT("not enough shared memory, please increase the \"-m\" parameter!\n");
abort();
found:
hp_frag_detach(qm, frag);
if (stats_are_ready())
update_stats_shm_frag_detach(frag);
else {
qm->used += frag->size;
qm->real_used += frag->size + FRAG_OVERHEAD;
}
/* split the fragment if possible */
shm_frag_split_unsafe(qm, frag, size);
#ifndef HP_MALLOC_FAST_STATS
if (stats_are_ready()) {
unsigned long real_used;
real_used = get_stat_val(shm_rused);
if (real_used > qm->max_real_used)
qm->max_real_used = real_used;
} else if (qm->real_used > qm->max_real_used)
qm->max_real_used = qm->real_used;
#endif
if (mem_hash_usage)
mem_hash_usage[init_hash]++;
return (char *)frag + sizeof *frag;
}
