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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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9
src/jemalloc.c
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@ -10,6 +10,7 @@
#include "jemalloc/internal/extent_dss.h"
#include "jemalloc/internal/extent_mmap.h"
#include "jemalloc/internal/fxp.h"
#include "jemalloc/internal/guard.h"
#include "jemalloc/internal/hook.h"
#include "jemalloc/internal/jemalloc_internal_types.h"
#include "jemalloc/internal/log.h"
@ -1616,6 +1617,14 @@ malloc_conf_init_helper(sc_data_t *sc_data, unsigned bin_shard_sizes[SC_NBINS],
}
CONF_CONTINUE;
}
CONF_HANDLE_SIZE_T(opt_san_guard_small,
"san_guard_small", 0, SIZE_T_MAX,
CONF_DONT_CHECK_MIN, CONF_DONT_CHECK_MAX, false)
CONF_HANDLE_SIZE_T(opt_san_guard_large,
"san_guard_large", 0, SIZE_T_MAX,
CONF_DONT_CHECK_MIN, CONF_DONT_CHECK_MAX, false)
CONF_ERROR("Invalid conf pair", k, klen, v, vlen);
#undef CONF_ERROR
#undef CONF_CONTINUE