add mprotect error when the mmap limit might be reached in secure mode (see issue
@@ -596,6 +596,18 @@ static void* mi_os_page_align_area_conservative(void* addr, size_t size, size_t*
return mi_os_page_align_areax(true, addr, size, newsize);
}
+static void mi_mprotect_hint(int err) {
+#if defined(MI_OS_USE_MMAP) && (MI_SECURE>=2) // guard page around every mimalloc page
+ if (err == ENOMEM) {
+ _mi_warning_message("the previous warning may have been caused by a low memory map limit.\n"
+ " On Linux this is controlled by the vm.max_map_count. For example:\n"
+ " > sudo sysctl -w vm.max_map_count=262144\n");
+ }
+#else
+ UNUSED(err);
+#endif
+}
+
// Commit/Decommit memory.
// Usuelly commit is aligned liberal, while decommit is aligned conservative.
// (but not for the reset version where we want commit to be conservative as well)
@@ -644,6 +656,7 @@ static bool mi_os_commitx(void* addr, size_t size, bool commit, bool conservativ
#endif
if (err != 0) {
_mi_warning_message("%s error: start: 0x%p, csize: 0x%x, err: %i\n", commit ? "commit" : "decommit", start, csize, err);
+ mi_mprotect_hint(err);
}
mi_assert_internal(err == 0);
return (err == 0);
@@ -762,6 +775,7 @@ static bool mi_os_protectx(void* addr, size_t size, bool protect) {
#endif
if (err != 0) {
_mi_warning_message("mprotect error: start: 0x%p, csize: 0x%x, err: %i\n", start, csize, err);
+ mi_mprotect_hint(err);
}
return (err == 0);
}
