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79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
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TEST_HEADER
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id = $HopeName$
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harness = 3.0
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summary = Get the last page in a chunk into the hysteresis fund
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language = c
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link = testlib.o
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parameters = CHUNK_SIZE=(1024*1024) OBJ_FROM=(1024*1024*2) \
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OBJ_TO=(1024*1024*3)
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OUTPUT_SPEC
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completed = yes
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END_HEADER
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*/
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/* This test was written to provoke the assertion in
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request.epcore.160256 (Assertion failure while purging the
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hysteresis fund.)
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drj suggested that the assertion would be provoked if we
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arranged for an arena chunk to have less than one whole
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page description on the last page occupied by the page table,
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arranged for the page corresponding to this page description
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to be in the hysteresis fund, and then purged the fund.
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This test attempts to cause this situation by creating an arena
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with a small chunk size, allocating an object that's bigger
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than the chunk size (hence causing a new chunk to be created),
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freeing it, then destroying the arena again. We repeat with
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different object sizes, until (we hope) eventually there is
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only a partial page descriptor in the last page occupied by
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the page table.
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We use an EPDR pool to increase the chance of the object covering
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the last page (but it's a VM arena so we can't be sure what zones
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will be used). Of course, the test is sensitive to the algorithm
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by which the arena decides how big to make the new chunk.
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*/
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#include "testlib.h"
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#include "mpsavm.h"
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#include "mpscepdl.h"
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mps_arena_t arena;
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mps_thr_t thread;
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mps_root_t root;
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static void test(void)
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{
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mps_pool_t pool;
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mps_addr_t a;
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size_t objsize;
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for (objsize = OBJ_FROM; objsize < OBJ_TO; objsize += 4096) {
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report("objsize", "%d", objsize);
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die(mps_arena_create(&arena, mps_arena_class_vm(), (size_t) CHUNK_SIZE),
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"create arena with 1MB chunk size");
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die(mps_thread_reg(&thread, arena), "register thread");
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die(mps_pool_create(&pool, arena, mps_class_epdr(), 65536, 32, 8),
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"create EPDR pool");
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mps_arena_spare_commit_limit_set(arena, (size_t) OBJ_TO);
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die(mps_alloc(&a, pool, objsize), "alloc");
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mps_free(pool, a, objsize);
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mps_pool_destroy(pool);
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mps_thread_dereg(thread);
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mps_arena_destroy(arena);
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}
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}
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int main(void)
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{
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easy_tramp(test);
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pass();
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return 0;
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}
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