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Add arena.i.retain_grow_limit

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This option controls the max size when grow_retained.  This is useful when we
have customized extent hooks reserving physical memory (e.g. 1G huge pages).
Without this feature, the default increasing sequence could result in fragmented
and wasted physical memory.
This commit is contained in:
Qi Wang 2017-11-02 17:48:39 -07:00 • committed by Qi Wang
parent 9f455e2786
commit e422fa8e7e
8 changed files with 146 additions and 5 deletions
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49
test/unit/mallctl.c
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@ -556,6 +556,54 @@ TEST_BEGIN(test_arena_i_dss) {
}
TEST_END
TEST_BEGIN(test_arena_i_retain_grow_limit) {
size_t old_limit, new_limit, default_limit;
size_t mib[3];
size_t miblen;
bool retain_enabled;
size_t sz = sizeof(retain_enabled);
assert_d_eq(mallctl("opt.retain", &retain_enabled, &sz, NULL, 0),
0, "Unexpected mallctl() failure");
test_skip_if(!retain_enabled);
sz = sizeof(default_limit);
miblen = sizeof(mib)/sizeof(size_t);
assert_d_eq(mallctlnametomib("arena.0.retain_grow_limit", mib, &miblen),
0, "Unexpected mallctlnametomib() error");
assert_d_eq(mallctlbymib(mib, miblen, &default_limit, &sz, NULL, 0), 0,
"Unexpected mallctl() failure");
assert_zu_eq(default_limit, sz_pind2sz(EXTENT_GROW_MAX_PIND),
"Unexpected default for retain_grow_limit");
new_limit = PAGE - 1;
assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, &new_limit,
sizeof(new_limit)), EFAULT, "Unexpected mallctl() success");
new_limit = PAGE + 1;
assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, &new_limit,
sizeof(new_limit)), 0, "Unexpected mallctl() failure");
assert_d_eq(mallctlbymib(mib, miblen, &old_limit, &sz, NULL, 0), 0,
"Unexpected mallctl() failure");
assert_zu_eq(old_limit, PAGE,
"Unexpected value for retain_grow_limit");
/* Expect grow less than psize class 10. */
new_limit = sz_pind2sz(10) - 1;
assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, &new_limit,
sizeof(new_limit)), 0, "Unexpected mallctl() failure");
assert_d_eq(mallctlbymib(mib, miblen, &old_limit, &sz, NULL, 0), 0,
"Unexpected mallctl() failure");
assert_zu_eq(old_limit, sz_pind2sz(9),
"Unexpected value for retain_grow_limit");
/* Restore to default. */
assert_d_eq(mallctlbymib(mib, miblen, NULL, NULL, &default_limit,
sizeof(default_limit)), 0, "Unexpected mallctl() failure");
}
TEST_END
TEST_BEGIN(test_arenas_dirty_decay_ms) {
ssize_t dirty_decay_ms, orig_dirty_decay_ms, prev_dirty_decay_ms;
size_t sz = sizeof(ssize_t);
@ -727,6 +775,7 @@ main(void) {
test_arena_i_purge,
test_arena_i_decay,
test_arena_i_dss,
test_arena_i_retain_grow_limit,
test_arenas_dirty_decay_ms,
test_arenas_muzzy_decay_ms,
test_arenas_constants,