018b162d67
This introduces a new sort of edata_t; a pageslab, and a set to manage them. This is part of a series of a commits to implement a hugepage allocator; the pageset will be per-arena, and track small page allocations requests within a larger extent allocated from a centralized hugepage allocator.
307 lines
9.3 KiB
C
307 lines
9.3 KiB
C
#include "test/jemalloc_test.h"
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#include "jemalloc/internal/psset.h"
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#define PAGESLAB_PAGES 64
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#define PAGESLAB_SIZE (PAGESLAB_PAGES << LG_PAGE)
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#define PAGESLAB_SN 123
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#define PAGESLAB_ADDR ((void *)(1234 << LG_PAGE))
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#define ALLOC_ARENA_IND 111
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#define ALLOC_ESN 222
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static void
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edata_init_test(edata_t *edata) {
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memset(edata, 0, sizeof(*edata));
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edata_arena_ind_set(edata, ALLOC_ARENA_IND);
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edata_esn_set(edata, ALLOC_ESN);
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}
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static void
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edata_expect(edata_t *edata, size_t page_offset, size_t page_cnt) {
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/*
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* Note that allocations should get the arena ind of their home
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* arena, *not* the arena ind of the pageslab allocator.
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*/
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expect_u_eq(ALLOC_ARENA_IND, edata_arena_ind_get(edata),
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"Arena ind changed");
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expect_ptr_eq(
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(void *)((uintptr_t)PAGESLAB_ADDR + (page_offset << LG_PAGE)),
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edata_addr_get(edata), "Didn't allocate in order");
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expect_zu_eq(page_cnt << LG_PAGE, edata_size_get(edata), "");
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expect_false(edata_slab_get(edata), "");
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expect_u_eq(SC_NSIZES, edata_szind_get_maybe_invalid(edata),
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"");
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expect_zu_eq(0, edata_sn_get(edata), "");
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expect_d_eq(edata_state_get(edata), extent_state_active, "");
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expect_false(edata_zeroed_get(edata), "");
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expect_true(edata_committed_get(edata), "");
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expect_d_eq(EXTENT_PAI_HPA, edata_pai_get(edata), "");
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expect_false(edata_is_head_get(edata), "");
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}
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TEST_BEGIN(test_empty) {
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bool err;
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edata_t pageslab;
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memset(&pageslab, 0, sizeof(pageslab));
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edata_t alloc;
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edata_init(&pageslab, /* arena_ind */ 0, PAGESLAB_ADDR, PAGESLAB_SIZE,
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/* slab */ true, SC_NSIZES, PAGESLAB_SN, extent_state_active,
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/* zeroed */ false, /* comitted */ true, EXTENT_PAI_HPA,
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EXTENT_IS_HEAD);
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edata_init_test(&alloc);
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psset_t psset;
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psset_init(&psset);
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/* Empty psset should return fail allocations. */
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err = psset_alloc_reuse(&psset, &alloc, PAGE);
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expect_true(err, "Empty psset succeeded in an allocation.");
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}
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TEST_END
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TEST_BEGIN(test_fill) {
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bool err;
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edata_t pageslab;
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memset(&pageslab, 0, sizeof(pageslab));
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edata_t alloc[PAGESLAB_PAGES];
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edata_init(&pageslab, /* arena_ind */ 0, PAGESLAB_ADDR, PAGESLAB_SIZE,
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/* slab */ true, SC_NSIZES, PAGESLAB_SN, extent_state_active,
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/* zeroed */ false, /* comitted */ true, EXTENT_PAI_HPA,
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EXTENT_IS_HEAD);
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psset_t psset;
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psset_init(&psset);
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edata_init_test(&alloc[0]);
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psset_alloc_new(&psset, &pageslab, &alloc[0], PAGE);
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for (size_t i = 1; i < PAGESLAB_PAGES; i++) {
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edata_init_test(&alloc[i]);
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err = psset_alloc_reuse(&psset, &alloc[i], PAGE);
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expect_false(err, "Nonempty psset failed page allocation.");
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}
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for (size_t i = 0; i < PAGESLAB_PAGES; i++) {
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edata_t *edata = &alloc[i];
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edata_expect(edata, i, 1);
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}
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/* The pageslab, and thus psset, should now have no allocations. */
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edata_t extra_alloc;
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edata_init_test(&extra_alloc);
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err = psset_alloc_reuse(&psset, &extra_alloc, PAGE);
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expect_true(err, "Alloc succeeded even though psset should be empty");
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}
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TEST_END
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TEST_BEGIN(test_reuse) {
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bool err;
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edata_t *ps;
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edata_t pageslab;
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memset(&pageslab, 0, sizeof(pageslab));
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edata_t alloc[PAGESLAB_PAGES];
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edata_init(&pageslab, /* arena_ind */ 0, PAGESLAB_ADDR, PAGESLAB_SIZE,
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/* slab */ true, SC_NSIZES, PAGESLAB_SN, extent_state_active,
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/* zeroed */ false, /* comitted */ true, EXTENT_PAI_HPA,
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EXTENT_IS_HEAD);
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psset_t psset;
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psset_init(&psset);
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edata_init_test(&alloc[0]);
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psset_alloc_new(&psset, &pageslab, &alloc[0], PAGE);
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for (size_t i = 1; i < PAGESLAB_PAGES; i++) {
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edata_init_test(&alloc[i]);
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err = psset_alloc_reuse(&psset, &alloc[i], PAGE);
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expect_false(err, "Nonempty psset failed page allocation.");
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}
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/* Free odd indices. */
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for (size_t i = 0; i < PAGESLAB_PAGES; i ++) {
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if (i % 2 == 0) {
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continue;
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}
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ps = psset_dalloc(&psset, &alloc[i]);
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expect_ptr_null(ps, "Nonempty pageslab evicted");
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}
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/* Realloc into them. */
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for (size_t i = 0; i < PAGESLAB_PAGES; i++) {
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if (i % 2 == 0) {
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continue;
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}
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err = psset_alloc_reuse(&psset, &alloc[i], PAGE);
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expect_false(err, "Nonempty psset failed page allocation.");
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edata_expect(&alloc[i], i, 1);
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}
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/* Now, free the pages at indices 0 or 1 mod 2. */
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for (size_t i = 0; i < PAGESLAB_PAGES; i++) {
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if (i % 4 > 1) {
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continue;
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}
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ps = psset_dalloc(&psset, &alloc[i]);
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expect_ptr_null(ps, "Nonempty pageslab evicted");
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}
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/* And realloc 2-page allocations into them. */
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for (size_t i = 0; i < PAGESLAB_PAGES; i++) {
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if (i % 4 != 0) {
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continue;
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}
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err = psset_alloc_reuse(&psset, &alloc[i], 2 * PAGE);
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expect_false(err, "Nonempty psset failed page allocation.");
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edata_expect(&alloc[i], i, 2);
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}
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/* Free all the 2-page allocations. */
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for (size_t i = 0; i < PAGESLAB_PAGES; i++) {
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if (i % 4 != 0) {
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continue;
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}
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ps = psset_dalloc(&psset, &alloc[i]);
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expect_ptr_null(ps, "Nonempty pageslab evicted");
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}
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/*
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* Free up a 1-page hole next to a 2-page hole, but somewhere in the
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* middle of the pageslab. Index 11 should be right before such a hole
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* (since 12 % 4 == 0).
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*/
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size_t index_of_3 = 11;
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ps = psset_dalloc(&psset, &alloc[index_of_3]);
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expect_ptr_null(ps, "Nonempty pageslab evicted");
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err = psset_alloc_reuse(&psset, &alloc[index_of_3], 3 * PAGE);
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expect_false(err, "Should have been able to find alloc.");
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edata_expect(&alloc[index_of_3], index_of_3, 3);
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/* Free up a 4-page hole at the end. */
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ps = psset_dalloc(&psset, &alloc[PAGESLAB_PAGES - 1]);
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expect_ptr_null(ps, "Nonempty pageslab evicted");
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ps = psset_dalloc(&psset, &alloc[PAGESLAB_PAGES - 2]);
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expect_ptr_null(ps, "Nonempty pageslab evicted");
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/* Make sure we can satisfy an allocation at the very end of a slab. */
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size_t index_of_4 = PAGESLAB_PAGES - 4;
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ps = psset_dalloc(&psset, &alloc[index_of_4]);
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expect_ptr_null(ps, "Nonempty pageslab evicted");
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err = psset_alloc_reuse(&psset, &alloc[index_of_4], 4 * PAGE);
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expect_false(err, "Should have been able to find alloc.");
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edata_expect(&alloc[index_of_4], index_of_4, 4);
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}
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TEST_END
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TEST_BEGIN(test_evict) {
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bool err;
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edata_t *ps;
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edata_t pageslab;
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memset(&pageslab, 0, sizeof(pageslab));
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edata_t alloc[PAGESLAB_PAGES];
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edata_init(&pageslab, /* arena_ind */ 0, PAGESLAB_ADDR, PAGESLAB_SIZE,
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/* slab */ true, SC_NSIZES, PAGESLAB_SN, extent_state_active,
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/* zeroed */ false, /* comitted */ true, EXTENT_PAI_HPA,
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EXTENT_IS_HEAD);
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psset_t psset;
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psset_init(&psset);
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/* Alloc the whole slab. */
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edata_init_test(&alloc[0]);
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psset_alloc_new(&psset, &pageslab, &alloc[0], PAGE);
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for (size_t i = 1; i < PAGESLAB_PAGES; i++) {
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edata_init_test(&alloc[i]);
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err = psset_alloc_reuse(&psset, &alloc[i], PAGE);
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expect_false(err, "Unxpected allocation failure");
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}
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/* Dealloc the whole slab, going forwards. */
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for (size_t i = 0; i < PAGESLAB_PAGES - 1; i++) {
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ps = psset_dalloc(&psset, &alloc[i]);
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expect_ptr_null(ps, "Nonempty pageslab evicted");
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}
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ps = psset_dalloc(&psset, &alloc[PAGESLAB_PAGES - 1]);
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expect_ptr_eq(&pageslab, ps, "Empty pageslab not evicted.");
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err = psset_alloc_reuse(&psset, &alloc[0], PAGE);
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expect_true(err, "psset should be empty.");
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}
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TEST_END
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TEST_BEGIN(test_multi_pageslab) {
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bool err;
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edata_t *ps;
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edata_t pageslab[2];
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memset(&pageslab, 0, sizeof(pageslab));
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edata_t alloc[2][PAGESLAB_PAGES];
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edata_init(&pageslab[0], /* arena_ind */ 0, PAGESLAB_ADDR, PAGESLAB_SIZE,
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/* slab */ true, SC_NSIZES, PAGESLAB_SN, extent_state_active,
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/* zeroed */ false, /* comitted */ true, EXTENT_PAI_HPA,
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EXTENT_IS_HEAD);
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edata_init(&pageslab[1], /* arena_ind */ 0,
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(void *)((uintptr_t)PAGESLAB_ADDR + PAGESLAB_SIZE), PAGESLAB_SIZE,
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/* slab */ true, SC_NSIZES, PAGESLAB_SN, extent_state_active,
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/* zeroed */ false, /* comitted */ true, EXTENT_PAI_HPA,
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EXTENT_IS_HEAD);
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psset_t psset;
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psset_init(&psset);
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/* Insert both slabs. */
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edata_init_test(&alloc[0][0]);
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psset_alloc_new(&psset, &pageslab[0], &alloc[0][0], PAGE);
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edata_init_test(&alloc[1][0]);
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psset_alloc_new(&psset, &pageslab[1], &alloc[1][0], PAGE);
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/* Fill them both up; make sure we do so in first-fit order. */
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for (size_t i = 0; i < 2; i++) {
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for (size_t j = 1; j < PAGESLAB_PAGES; j++) {
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edata_init_test(&alloc[i][j]);
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err = psset_alloc_reuse(&psset, &alloc[i][j], PAGE);
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expect_false(err,
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"Nonempty psset failed page allocation.");
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assert_ptr_eq(&pageslab[i], edata_ps_get(&alloc[i][j]),
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"Didn't pick pageslabs in first-fit");
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}
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}
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/*
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* Free up a 2-page hole in the earlier slab, and a 1-page one in the
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* later one. We should still pick the earlier slab for a 1-page
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* allocation.
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*/
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ps = psset_dalloc(&psset, &alloc[0][0]);
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expect_ptr_null(ps, "Unexpected eviction");
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ps = psset_dalloc(&psset, &alloc[0][1]);
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expect_ptr_null(ps, "Unexpected eviction");
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ps = psset_dalloc(&psset, &alloc[1][0]);
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expect_ptr_null(ps, "Unexpected eviction");
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err = psset_alloc_reuse(&psset, &alloc[0][0], PAGE);
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expect_ptr_eq(&pageslab[0], edata_ps_get(&alloc[0][0]),
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"Should have picked first pageslab");
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/*
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* Now both slabs have 1-page holes. Free up a second one in the later
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* slab.
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*/
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ps = psset_dalloc(&psset, &alloc[1][1]);
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expect_ptr_null(ps, "Unexpected eviction");
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/*
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* We should be able to allocate a 2-page object, even though an earlier
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* size class is nonempty.
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*/
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err = psset_alloc_reuse(&psset, &alloc[1][0], 2 * PAGE);
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expect_false(err, "Allocation should have succeeded");
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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_no_reentrancy(
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test_empty,
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test_fill,
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test_reuse,
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test_evict,
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test_multi_pageslab);
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}
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