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Allow setting extent hooks on uninitialized auto arenas.

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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
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31
src/ctl.c
View File

@ -2251,10 +2251,31 @@ arena_i_extent_hooks_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx); malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
MIB_UNSIGNED(arena_ind, 1); MIB_UNSIGNED(arena_ind, 1);
if (arena_ind < narenas_total_get() && (arena = if (arena_ind < narenas_total_get()) {
arena_get(tsd_tsdn(tsd), arena_ind, false)) != NULL) {
if (newp != NULL) {
extent_hooks_t *old_extent_hooks; 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 {
if (newp != NULL) {
extent_hooks_t *new_extent_hooks extent_hooks_t *new_extent_hooks
JEMALLOC_CC_SILENCE_INIT(NULL); JEMALLOC_CC_SILENCE_INIT(NULL);
WRITE(new_extent_hooks, extent_hooks_t *); WRITE(new_extent_hooks, extent_hooks_t *);
@ -2262,10 +2283,10 @@ arena_i_extent_hooks_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
new_extent_hooks); new_extent_hooks);
READ(old_extent_hooks, extent_hooks_t *); READ(old_extent_hooks, extent_hooks_t *);
} else { } else {
extent_hooks_t *old_extent_hooks = old_extent_hooks = extent_hooks_get(arena);
extent_hooks_get(arena);
READ(old_extent_hooks, extent_hooks_t *); READ(old_extent_hooks, extent_hooks_t *);
} }
}
} else { } else {
ret = EFAULT; ret = EFAULT;
goto label_return; goto label_return;

38
test/integration/extent.c
View File

@ -98,6 +98,43 @@ test_extent_body(unsigned arena_ind) {
dallocx(p, flags); 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 static void
test_manual_hook_body(void) { test_manual_hook_body(void) {
unsigned arena_ind; unsigned arena_ind;
@ -169,6 +206,7 @@ test_manual_hook_body(void) {
} }
TEST_BEGIN(test_extent_manual_hook) { TEST_BEGIN(test_extent_manual_hook) {
test_manual_hook_auto_arena();
test_manual_hook_body(); test_manual_hook_body();
/* Test failure paths. */ /* Test failure paths. */