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add experimental.arenas_create_ext mallctl

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This mallctl accepts an arena_config_t structure which
can be used to customize the behavior of the arena.
Right now it contains extent_hooks and a new option,
metadata_use_hooks, which controls whether the extent
hooks are also used for metadata allocation.

The medata_use_hooks option has two main use cases:

1. In heterogeneous memory systems, to avoid metadata
being placed on potentially slower memory.

2. Avoiding virtual memory from being leaked as a result
of metadata allocation failure originating in an extent hook.
This commit is contained in:
Piotr Balcer
2021-08-23 14:03:35 +02:00
committed by Qi Wang
parent a9031a0970
commit 7bb05e04be
17 changed files with 165 additions and 41 deletions
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42
src/ctl.c
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@@ -315,6 +315,7 @@ INDEX_PROTO(experimental_arenas_i)
CTL_PROTO(experimental_prof_recent_alloc_max)
CTL_PROTO(experimental_prof_recent_alloc_dump)
CTL_PROTO(experimental_batch_alloc)
CTL_PROTO(experimental_arenas_create_ext)
#define MUTEX_STATS_CTL_PROTO_GEN(n) \
CTL_PROTO(stats_##n##_num_ops) \
@@ -870,6 +871,7 @@ static const ctl_named_node_t experimental_node[] = {
{NAME("hooks"), CHILD(named, experimental_hooks)},
{NAME("utilization"), CHILD(named, experimental_utilization)},
{NAME("arenas"), CHILD(indexed, experimental_arenas)},
{NAME("arenas_create_ext"), CTL(experimental_arenas_create_ext)},
{NAME("prof_recent"), CHILD(named, experimental_prof_recent)},
{NAME("batch_alloc"), CTL(experimental_batch_alloc)},
{NAME("thread"), CHILD(named, experimental_thread)}
@@ -1242,7 +1244,7 @@ ctl_arena_refresh(tsdn_t *tsdn, arena_t *arena, ctl_arena_t *ctl_sdarena,
}
static unsigned
ctl_arena_init(tsd_t *tsd, extent_hooks_t *extent_hooks) {
ctl_arena_init(tsd_t *tsd, const arena_config_t *config) {
unsigned arena_ind;
ctl_arena_t *ctl_arena;
@@ -1260,7 +1262,7 @@ ctl_arena_init(tsd_t *tsd, extent_hooks_t *extent_hooks) {
}
/* Initialize new arena. */
if (arena_init(tsd_tsdn(tsd), arena_ind, extent_hooks) == NULL) {
if (arena_init(tsd_tsdn(tsd), arena_ind, config) == NULL) {
return UINT_MAX;
}
@@ -2881,8 +2883,11 @@ arena_i_extent_hooks_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
extent_hooks_t *new_extent_hooks
JEMALLOC_CC_SILENCE_INIT(NULL);
WRITE(new_extent_hooks, extent_hooks_t *);
arena_config_t config = arena_config_default;
config.extent_hooks = new_extent_hooks;
arena = arena_init(tsd_tsdn(tsd), arena_ind,
new_extent_hooks);
&config);
if (arena == NULL) {
ret = EFAULT;
goto label_return;
@@ -3069,15 +3074,14 @@ static int
arenas_create_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
void *oldp, size_t *oldlenp, void *newp, size_t newlen) {
int ret;
extent_hooks_t *extent_hooks;
unsigned arena_ind;
malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
VERIFY_READ(unsigned);
extent_hooks = (extent_hooks_t *)&ehooks_default_extent_hooks;
WRITE(extent_hooks, extent_hooks_t *);
if ((arena_ind = ctl_arena_init(tsd, extent_hooks)) == UINT_MAX) {
arena_config_t config = arena_config_default;
WRITE(config.extent_hooks, extent_hooks_t *);
if ((arena_ind = ctl_arena_init(tsd, &config)) == UINT_MAX) {
ret = EAGAIN;
goto label_return;
}
@@ -3089,6 +3093,30 @@ label_return:
return ret;
}
static int
experimental_arenas_create_ext_ctl(tsd_t *tsd,
const size_t *mib, size_t miblen,
void *oldp, size_t *oldlenp, void *newp, size_t newlen) {
int ret;
unsigned arena_ind;
malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
arena_config_t config = arena_config_default;
VERIFY_READ(unsigned);
WRITE(config, arena_config_t);
if ((arena_ind = ctl_arena_init(tsd, &config)) == UINT_MAX) {
ret = EAGAIN;
goto label_return;
}
READ(arena_ind, unsigned);
ret = 0;
label_return:
malloc_mutex_unlock(tsd_tsdn(tsd), &ctl_mtx);
return ret;
}
static int
arenas_lookup_ctl(tsd_t *tsd, const size_t *mib,
size_t miblen, void *oldp, size_t *oldlenp, void *newp,