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remove the reset_discards option

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This commit is contained in:
daan 2019-08-20 07:06:11 -07:00
parent 598233135c
commit d52e4039b6
3 changed files with 5 additions and 18 deletions
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1
include/mimalloc.h
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@ -231,7 +231,6 @@ typedef enum mi_option_e {
mi_option_page_reset,
mi_option_cache_reset,
mi_option_reset_decommits,
mi_option_reset_discards,
_mi_option_last
} mi_option_t;

3
src/options.c
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@ -64,8 +64,7 @@ static mi_option_desc_t options[_mi_option_last] =
{ 0, UNINIT, MI_OPTION(large_os_pages) }, // use large OS pages, use only with eager commit to prevent fragmentation of VMA's
{ 0, UNINIT, MI_OPTION(page_reset) },
{ 0, UNINIT, MI_OPTION(cache_reset) },
{ 0, UNINIT, MI_OPTION(reset_decommits) }, // note: cannot enable this if secure is on
{ 0, UNINIT, MI_OPTION(reset_discards) } // note: cannot enable this if secure is on
{ 0, UNINIT, MI_OPTION(reset_decommits) } // note: cannot enable this if secure is on
};
static void mi_option_init(mi_option_desc_t* desc);

19
src/os.c
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@ -84,11 +84,9 @@ static size_t mi_os_good_alloc_size(size_t size, size_t alignment) {
#if defined(_WIN32)
// We use VirtualAlloc2 for aligned allocation, but it is only supported on Windows 10 and Windows Server 2016.
// So, we need to look it up dynamically to run on older systems. (use __stdcall for 32-bit compatibility)
// Same for DiscardVirtualMemory. (hide MEM_EXTENDED_PARAMETER to compile with older SDK's)
// (hide MEM_EXTENDED_PARAMETER to compile with older SDK's)
typedef PVOID(__stdcall *PVirtualAlloc2)(HANDLE, PVOID, SIZE_T, ULONG, ULONG, /* MEM_EXTENDED_PARAMETER* */ void*, ULONG);
typedef DWORD(__stdcall *PDiscardVirtualMemory)(PVOID,SIZE_T);
static PVirtualAlloc2 pVirtualAlloc2 = NULL;
static PDiscardVirtualMemory pDiscardVirtualMemory = NULL;
void _mi_os_init(void) {
// get the page size
@ -103,7 +101,6 @@ void _mi_os_init(void) {
// use VirtualAlloc2FromApp if possible as it is available to Windows store apps
pVirtualAlloc2 = (PVirtualAlloc2)GetProcAddress(hDll, "VirtualAlloc2FromApp");
if (pVirtualAlloc2==NULL) pVirtualAlloc2 = (PVirtualAlloc2)GetProcAddress(hDll, "VirtualAlloc2");
pDiscardVirtualMemory = (PDiscardVirtualMemory)GetProcAddress(hDll, "DiscardVirtualMemory");
FreeLibrary(hDll);
}
// Try to see if large OS pages are supported
@ -558,17 +555,9 @@ static bool mi_os_resetx(void* addr, size_t size, bool reset, mi_stats_t* stats)
#if defined(_WIN32)
// Testing shows that for us (on `malloc-large`) MEM_RESET is 2x faster than DiscardVirtualMemory
// (but this is for an access pattern that immediately reuses the memory)
if (mi_option_is_enabled(mi_option_reset_discards) && pDiscardVirtualMemory != NULL) {
DWORD ok = (*pDiscardVirtualMemory)(start, csize);
mi_assert_internal(ok == ERROR_SUCCESS);
if (ok != ERROR_SUCCESS) return false;
}
else {
void* p = VirtualAlloc(start, csize, MEM_RESET, PAGE_READWRITE);
mi_assert_internal(p == start);
if (p != start) return false;
}
void* p = VirtualAlloc(start, csize, MEM_RESET, PAGE_READWRITE);
mi_assert_internal(p == start);
if (p != start) return false;
#else
#if defined(MADV_FREE)
static int advice = MADV_FREE;