Try to decommit new chunks.
Always leave decommit disabled on non-Windows systems.
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1f27abc1b1
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@ -145,7 +145,8 @@ chunk_alloc_dss(arena_t *arena, void *new_addr, size_t size, size_t alignment,
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ret, size);
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memset(ret, 0, size);
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}
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*commit = true;
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if (!*commit)
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*commit = pages_decommit(ret, size);
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return (ret);
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}
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} while (dss_prev != (void *)-1);
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@ -24,7 +24,8 @@ chunk_alloc_mmap_slow(size_t size, size_t alignment, bool *zero, bool *commit)
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assert(ret != NULL);
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*zero = true;
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*commit = true;
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if (!*commit)
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*commit = pages_decommit(ret, size);
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return (ret);
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}
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@ -61,7 +62,8 @@ chunk_alloc_mmap(size_t size, size_t alignment, bool *zero, bool *commit)
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assert(ret != NULL);
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*zero = true;
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*commit = true;
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if (!*commit)
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*commit = pages_decommit(ret, size);
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return (ret);
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}
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@ -102,7 +102,13 @@ pages_commit_impl(void *addr, size_t size, bool commit)
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{
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#ifndef _WIN32
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if (config_debug) {
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/*
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* The following decommit/commit implementation is functional, but
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* always disabled because it doesn't add value beyong improved
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* debugging (at the cost of extra system calls) on systems that
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* overcommit.
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*/
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if (false) {
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int prot = commit ? (PROT_READ | PROT_WRITE) : PROT_NONE;
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void *result = mmap(addr, size, prot, MAP_PRIVATE | MAP_ANON |
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MAP_FIXED, -1, 0);
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@ -49,25 +49,30 @@ bool
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chunk_commit(void *chunk, size_t size, size_t offset, size_t length,
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unsigned arena_ind)
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{
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bool err;
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TRACE_HOOK("%s(chunk=%p, size=%zu, offset=%zu, length=%zu, "
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"arena_ind=%u)\n", __func__, chunk, size, offset, length,
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arena_ind);
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did_commit = true;
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memset((void *)((uintptr_t)chunk + offset), 0, length);
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return (false);
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err = old_hooks.commit(chunk, size, offset, length, arena_ind);
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did_commit = !err;
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return (err);
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}
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bool
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chunk_decommit(void *chunk, size_t size, size_t offset, size_t length,
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unsigned arena_ind)
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{
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bool err;
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TRACE_HOOK("%s(chunk=%p, size=%zu, offset=%zu, length=%zu, "
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"arena_ind=%u)\n", __func__, chunk, size, offset, length,
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arena_ind);
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did_decommit = true;
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return (!do_decommit);
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if (!do_decommit)
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return (true);
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err = old_hooks.decommit(chunk, size, offset, length, arena_ind);
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did_decommit = !err;
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return (err);
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}
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bool
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@ -167,7 +172,7 @@ TEST_BEGIN(test_chunk)
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assert_d_eq(mallctl("arena.0.purge", NULL, NULL, NULL, 0), 0,
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"Unexpected arena.0.purge error");
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assert_true(did_dalloc, "Expected dalloc");
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assert_true(did_decommit, "Expected decommit");
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assert_false(did_decommit, "Unexpected decommit");
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assert_true(did_purge, "Expected purge");
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dallocx(p, 0);
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do_dalloc = true;
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@ -185,12 +190,11 @@ TEST_BEGIN(test_chunk)
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"Unexpected xallocx() failure");
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assert_d_eq(mallctl("arena.0.purge", NULL, NULL, NULL, 0), 0,
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"Unexpected arena.0.purge error");
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assert_true(did_decommit, "Expected decommit");
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assert_true(did_split, "Expected split");
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assert_zu_eq(xallocx(p, huge0 * 2, 0, 0), huge0 * 2,
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"Unexpected xallocx() failure");
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assert_true(did_commit, "Expected commit");
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assert_true(did_commit, "Expected merge");
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assert_b_eq(did_decommit, did_commit, "Expected decommit/commit match");
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assert_true(did_merge, "Expected merge");
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dallocx(p, 0);
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do_dalloc = true;
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do_decommit = false;
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@ -222,11 +226,10 @@ TEST_BEGIN(test_chunk)
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"Unexpected xallocx() failure");
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assert_d_eq(mallctl("arena.0.purge", NULL, NULL, NULL, 0), 0,
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"Unexpected arena.0.purge error");
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assert_true(did_decommit, "Expected decommit");
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did_commit = false;
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assert_zu_eq(xallocx(p, large1, 0, 0), large1,
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"Unexpected xallocx() failure");
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assert_true(did_commit, "Expected commit");
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assert_b_eq(did_decommit, did_commit, "Expected decommit/commit match");
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dallocx(p, 0);
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do_decommit = false;
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