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Implement guard pages.

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Adding guarded extents, which are regular extents surrounded by guard pages
(mprotected).  To reduce syscalls, small guarded extents are cached as a
separate eset in ecache, and decay through the dirty / muzzy / retained pipeline
as usual.
This commit is contained in:
Qi Wang 2021-04-26 14:22:25 -07:00 • committed by Qi Wang
parent 7bb05e04be
commit deb8e62a83
41 changed files with 920 additions and 251 deletions
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7
test/unit/retained.c
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@ -1,5 +1,6 @@
#include "test/jemalloc_test.h"
#include "jemalloc/internal/guard.h"
#include "jemalloc/internal/spin.h"
static unsigned arena_ind;
@ -103,7 +104,8 @@ TEST_BEGIN(test_retained) {
arena_ind = do_arena_create(NULL);
sz = nallocx(HUGEPAGE, 0);
esz = sz + sz_large_pad;
size_t guard_sz = san_enabled() ? PAGE_GUARDS_SIZE : 0;
esz = sz + sz_large_pad + guard_sz;
atomic_store_u(&epoch, 0, ATOMIC_RELAXED);
@ -133,7 +135,8 @@ TEST_BEGIN(test_retained) {
*/
do_refresh();
size_t allocated = esz * nthreads * PER_THD_NALLOCS;
size_t allocated = (esz - guard_sz) * nthreads *
PER_THD_NALLOCS;
size_t active = do_get_active(arena_ind);
expect_zu_le(allocated, active, "Unexpected active memory");
size_t mapped = do_get_mapped(arena_ind);