Allow setting extent hooks on uninitialized auto arenas.

Setting extent hooks can result in initializing an unused auto arena.  This is
useful to install extent hooks on auto arenas from the beginning.
This commit is contained in:
Qi Wang 2018-04-11 15:15:26 -07:00 committed by Qi Wang
parent 02585420c3
commit 3f0dc64c6b
2 changed files with 71 additions and 12 deletions

View File

@ -2251,20 +2251,41 @@ arena_i_extent_hooks_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
MIB_UNSIGNED(arena_ind, 1);
if (arena_ind < narenas_total_get() && (arena =
arena_get(tsd_tsdn(tsd), arena_ind, false)) != NULL) {
if (newp != NULL) {
extent_hooks_t *old_extent_hooks;
extent_hooks_t *new_extent_hooks
JEMALLOC_CC_SILENCE_INIT(NULL);
WRITE(new_extent_hooks, extent_hooks_t *);
old_extent_hooks = extent_hooks_set(tsd, arena,
new_extent_hooks);
if (arena_ind < narenas_total_get()) {
extent_hooks_t *old_extent_hooks;
arena = arena_get(tsd_tsdn(tsd), arena_ind, false);
if (arena == NULL) {
if (arena_ind >= narenas_auto) {
ret = EFAULT;
goto label_return;
}
old_extent_hooks =
(extent_hooks_t *)&extent_hooks_default;
READ(old_extent_hooks, extent_hooks_t *);
if (newp != NULL) {
/* Initialize a new arena as a side effect. */
extent_hooks_t *new_extent_hooks
JEMALLOC_CC_SILENCE_INIT(NULL);
WRITE(new_extent_hooks, extent_hooks_t *);
arena = arena_init(tsd_tsdn(tsd), arena_ind,
new_extent_hooks);
if (arena == NULL) {
ret = EFAULT;
goto label_return;
}
}
} else {
extent_hooks_t *old_extent_hooks =
extent_hooks_get(arena);
READ(old_extent_hooks, extent_hooks_t *);
if (newp != NULL) {
extent_hooks_t *new_extent_hooks
JEMALLOC_CC_SILENCE_INIT(NULL);
WRITE(new_extent_hooks, extent_hooks_t *);
old_extent_hooks = extent_hooks_set(tsd, arena,
new_extent_hooks);
READ(old_extent_hooks, extent_hooks_t *);
} else {
old_extent_hooks = extent_hooks_get(arena);
READ(old_extent_hooks, extent_hooks_t *);
}
}
} else {
ret = EFAULT;

View File

@ -98,6 +98,43 @@ test_extent_body(unsigned arena_ind) {
dallocx(p, flags);
}
static void
test_manual_hook_auto_arena(void) {
unsigned narenas;
size_t old_size, new_size, sz;
size_t hooks_mib[3];
size_t hooks_miblen;
extent_hooks_t *new_hooks, *old_hooks;
extent_hooks_prep();
sz = sizeof(unsigned);
/* Get number of auto arenas. */
assert_d_eq(mallctl("opt.narenas", (void *)&narenas, &sz, NULL, 0),
0, "Unexpected mallctl() failure");
if (narenas == 1) {
return;
}
/* Install custom extent hooks on arena 1 (might not be initialized). */
hooks_miblen = sizeof(hooks_mib)/sizeof(size_t);
assert_d_eq(mallctlnametomib("arena.0.extent_hooks", hooks_mib,
&hooks_miblen), 0, "Unexpected mallctlnametomib() failure");
hooks_mib[1] = 1;
old_size = sizeof(extent_hooks_t *);
new_hooks = &hooks;
new_size = sizeof(extent_hooks_t *);
assert_d_eq(mallctlbymib(hooks_mib, hooks_miblen, (void *)&old_hooks,
&old_size, (void *)&new_hooks, new_size), 0,
"Unexpected extent_hooks error");
static bool auto_arena_created = false;
if (old_hooks != &hooks) {
assert_b_eq(auto_arena_created, false,
"Expected auto arena 1 created only once.");
auto_arena_created = true;
}
}
static void
test_manual_hook_body(void) {
unsigned arena_ind;
@ -169,6 +206,7 @@ test_manual_hook_body(void) {
}
TEST_BEGIN(test_extent_manual_hook) {
test_manual_hook_auto_arena();
test_manual_hook_body();
/* Test failure paths. */