7bb05e04be
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.
288 lines
9.1 KiB
C
288 lines
9.1 KiB
C
#include "test/jemalloc_test.h"
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#include "test/extent_hooks.h"
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#include "jemalloc/internal/arena_types.h"
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static void
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test_extent_body(unsigned arena_ind) {
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void *p;
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size_t large0, large1, large2, sz;
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size_t purge_mib[3];
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size_t purge_miblen;
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int flags;
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bool xallocx_success_a, xallocx_success_b, xallocx_success_c;
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flags = MALLOCX_ARENA(arena_ind) | MALLOCX_TCACHE_NONE;
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/* Get large size classes. */
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sz = sizeof(size_t);
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expect_d_eq(mallctl("arenas.lextent.0.size", (void *)&large0, &sz, NULL,
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0), 0, "Unexpected arenas.lextent.0.size failure");
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expect_d_eq(mallctl("arenas.lextent.1.size", (void *)&large1, &sz, NULL,
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0), 0, "Unexpected arenas.lextent.1.size failure");
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expect_d_eq(mallctl("arenas.lextent.2.size", (void *)&large2, &sz, NULL,
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0), 0, "Unexpected arenas.lextent.2.size failure");
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/* Test dalloc/decommit/purge cascade. */
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purge_miblen = sizeof(purge_mib)/sizeof(size_t);
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expect_d_eq(mallctlnametomib("arena.0.purge", purge_mib, &purge_miblen),
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0, "Unexpected mallctlnametomib() failure");
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purge_mib[1] = (size_t)arena_ind;
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called_alloc = false;
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try_alloc = true;
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try_dalloc = false;
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try_decommit = false;
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p = mallocx(large0 * 2, flags);
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expect_ptr_not_null(p, "Unexpected mallocx() error");
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expect_true(called_alloc, "Expected alloc call");
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called_dalloc = false;
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called_decommit = false;
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did_purge_lazy = false;
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did_purge_forced = false;
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called_split = false;
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xallocx_success_a = (xallocx(p, large0, 0, flags) == large0);
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expect_d_eq(mallctlbymib(purge_mib, purge_miblen, NULL, NULL, NULL, 0),
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0, "Unexpected arena.%u.purge error", arena_ind);
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if (xallocx_success_a) {
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expect_true(called_dalloc, "Expected dalloc call");
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expect_true(called_decommit, "Expected decommit call");
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expect_true(did_purge_lazy || did_purge_forced,
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"Expected purge");
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expect_true(called_split, "Expected split call");
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}
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dallocx(p, flags);
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try_dalloc = true;
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/* Test decommit/commit and observe split/merge. */
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try_dalloc = false;
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try_decommit = true;
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p = mallocx(large0 * 2, flags);
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expect_ptr_not_null(p, "Unexpected mallocx() error");
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did_decommit = false;
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did_commit = false;
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called_split = false;
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did_split = false;
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did_merge = false;
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xallocx_success_b = (xallocx(p, large0, 0, flags) == large0);
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expect_d_eq(mallctlbymib(purge_mib, purge_miblen, NULL, NULL, NULL, 0),
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0, "Unexpected arena.%u.purge error", arena_ind);
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if (xallocx_success_b) {
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expect_true(did_split, "Expected split");
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}
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xallocx_success_c = (xallocx(p, large0 * 2, 0, flags) == large0 * 2);
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if (did_split) {
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expect_b_eq(did_decommit, did_commit,
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"Expected decommit/commit match");
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}
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if (xallocx_success_b && xallocx_success_c) {
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expect_true(did_merge, "Expected merge");
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}
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dallocx(p, flags);
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try_dalloc = true;
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try_decommit = false;
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/* Make sure non-large allocation succeeds. */
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p = mallocx(42, flags);
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expect_ptr_not_null(p, "Unexpected mallocx() error");
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dallocx(p, flags);
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}
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static void
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test_manual_hook_auto_arena(void) {
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unsigned narenas;
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size_t old_size, new_size, sz;
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size_t hooks_mib[3];
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size_t hooks_miblen;
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extent_hooks_t *new_hooks, *old_hooks;
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extent_hooks_prep();
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sz = sizeof(unsigned);
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/* Get number of auto arenas. */
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expect_d_eq(mallctl("opt.narenas", (void *)&narenas, &sz, NULL, 0),
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0, "Unexpected mallctl() failure");
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if (narenas == 1) {
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return;
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}
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/* Install custom extent hooks on arena 1 (might not be initialized). */
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hooks_miblen = sizeof(hooks_mib)/sizeof(size_t);
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expect_d_eq(mallctlnametomib("arena.0.extent_hooks", hooks_mib,
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&hooks_miblen), 0, "Unexpected mallctlnametomib() failure");
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hooks_mib[1] = 1;
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old_size = sizeof(extent_hooks_t *);
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new_hooks = &hooks;
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new_size = sizeof(extent_hooks_t *);
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expect_d_eq(mallctlbymib(hooks_mib, hooks_miblen, (void *)&old_hooks,
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&old_size, (void *)&new_hooks, new_size), 0,
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"Unexpected extent_hooks error");
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static bool auto_arena_created = false;
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if (old_hooks != &hooks) {
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expect_b_eq(auto_arena_created, false,
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"Expected auto arena 1 created only once.");
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auto_arena_created = true;
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}
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}
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static void
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test_manual_hook_body(void) {
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unsigned arena_ind;
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size_t old_size, new_size, sz;
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size_t hooks_mib[3];
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size_t hooks_miblen;
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extent_hooks_t *new_hooks, *old_hooks;
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extent_hooks_prep();
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sz = sizeof(unsigned);
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expect_d_eq(mallctl("arenas.create", (void *)&arena_ind, &sz, NULL, 0),
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0, "Unexpected mallctl() failure");
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/* Install custom extent hooks. */
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hooks_miblen = sizeof(hooks_mib)/sizeof(size_t);
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expect_d_eq(mallctlnametomib("arena.0.extent_hooks", hooks_mib,
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&hooks_miblen), 0, "Unexpected mallctlnametomib() failure");
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hooks_mib[1] = (size_t)arena_ind;
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old_size = sizeof(extent_hooks_t *);
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new_hooks = &hooks;
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new_size = sizeof(extent_hooks_t *);
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expect_d_eq(mallctlbymib(hooks_mib, hooks_miblen, (void *)&old_hooks,
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&old_size, (void *)&new_hooks, new_size), 0,
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"Unexpected extent_hooks error");
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expect_ptr_ne(old_hooks->alloc, extent_alloc_hook,
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"Unexpected extent_hooks error");
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expect_ptr_ne(old_hooks->dalloc, extent_dalloc_hook,
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"Unexpected extent_hooks error");
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expect_ptr_ne(old_hooks->commit, extent_commit_hook,
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"Unexpected extent_hooks error");
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expect_ptr_ne(old_hooks->decommit, extent_decommit_hook,
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"Unexpected extent_hooks error");
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expect_ptr_ne(old_hooks->purge_lazy, extent_purge_lazy_hook,
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"Unexpected extent_hooks error");
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expect_ptr_ne(old_hooks->purge_forced, extent_purge_forced_hook,
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"Unexpected extent_hooks error");
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expect_ptr_ne(old_hooks->split, extent_split_hook,
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"Unexpected extent_hooks error");
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expect_ptr_ne(old_hooks->merge, extent_merge_hook,
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"Unexpected extent_hooks error");
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if (!is_background_thread_enabled()) {
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test_extent_body(arena_ind);
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}
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/* Restore extent hooks. */
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expect_d_eq(mallctlbymib(hooks_mib, hooks_miblen, NULL, NULL,
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(void *)&old_hooks, new_size), 0, "Unexpected extent_hooks error");
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expect_d_eq(mallctlbymib(hooks_mib, hooks_miblen, (void *)&old_hooks,
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&old_size, NULL, 0), 0, "Unexpected extent_hooks error");
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expect_ptr_eq(old_hooks, default_hooks, "Unexpected extent_hooks error");
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expect_ptr_eq(old_hooks->alloc, default_hooks->alloc,
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"Unexpected extent_hooks error");
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expect_ptr_eq(old_hooks->dalloc, default_hooks->dalloc,
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"Unexpected extent_hooks error");
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expect_ptr_eq(old_hooks->commit, default_hooks->commit,
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"Unexpected extent_hooks error");
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expect_ptr_eq(old_hooks->decommit, default_hooks->decommit,
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"Unexpected extent_hooks error");
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expect_ptr_eq(old_hooks->purge_lazy, default_hooks->purge_lazy,
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"Unexpected extent_hooks error");
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expect_ptr_eq(old_hooks->purge_forced, default_hooks->purge_forced,
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"Unexpected extent_hooks error");
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expect_ptr_eq(old_hooks->split, default_hooks->split,
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"Unexpected extent_hooks error");
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expect_ptr_eq(old_hooks->merge, default_hooks->merge,
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"Unexpected extent_hooks error");
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}
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TEST_BEGIN(test_extent_manual_hook) {
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test_manual_hook_auto_arena();
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test_manual_hook_body();
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/* Test failure paths. */
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try_split = false;
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test_manual_hook_body();
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try_merge = false;
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test_manual_hook_body();
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try_purge_lazy = false;
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try_purge_forced = false;
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test_manual_hook_body();
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try_split = try_merge = try_purge_lazy = try_purge_forced = true;
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}
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TEST_END
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TEST_BEGIN(test_extent_auto_hook) {
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unsigned arena_ind;
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size_t new_size, sz;
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extent_hooks_t *new_hooks;
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extent_hooks_prep();
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sz = sizeof(unsigned);
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new_hooks = &hooks;
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new_size = sizeof(extent_hooks_t *);
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expect_d_eq(mallctl("arenas.create", (void *)&arena_ind, &sz,
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(void *)&new_hooks, new_size), 0, "Unexpected mallctl() failure");
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test_skip_if(is_background_thread_enabled());
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test_extent_body(arena_ind);
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}
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TEST_END
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static void
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test_arenas_create_ext_base(arena_config_t config,
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bool expect_hook_data, bool expect_hook_metadata)
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{
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unsigned arena, arena1;
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void *ptr;
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size_t sz = sizeof(unsigned);
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extent_hooks_prep();
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called_alloc = false;
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expect_d_eq(mallctl("experimental.arenas_create_ext",
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(void *)&arena, &sz, &config, sizeof(arena_config_t)), 0,
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"Unexpected mallctl() failure");
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expect_b_eq(called_alloc, expect_hook_metadata,
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"expected hook metadata alloc mismatch");
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called_alloc = false;
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ptr = mallocx(42, MALLOCX_ARENA(arena) | MALLOCX_TCACHE_NONE);
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expect_b_eq(called_alloc, expect_hook_data,
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"expected hook data alloc mismatch");
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expect_ptr_not_null(ptr, "Unexpected mallocx() failure");
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expect_d_eq(mallctl("arenas.lookup", &arena1, &sz, &ptr, sizeof(ptr)),
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0, "Unexpected mallctl() failure");
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expect_u_eq(arena, arena1, "Unexpected arena index");
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dallocx(ptr, 0);
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}
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TEST_BEGIN(test_arenas_create_ext_with_ehooks_no_metadata) {
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arena_config_t config;
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config.extent_hooks = &hooks;
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config.metadata_use_hooks = false;
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test_arenas_create_ext_base(config, true, false);
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}
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TEST_END
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TEST_BEGIN(test_arenas_create_ext_with_ehooks_with_metadata) {
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arena_config_t config;
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config.extent_hooks = &hooks;
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config.metadata_use_hooks = true;
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test_arenas_create_ext_base(config, true, true);
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}
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TEST_END
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int
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main(void) {
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return test(
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test_extent_manual_hook,
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test_extent_auto_hook,
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test_arenas_create_ext_with_ehooks_no_metadata,
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test_arenas_create_ext_with_ehooks_with_metadata);
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}
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