xmrig/win/memory_win.c

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/* XMRig
* Copyright 2010 Jeff Garzik <jgarzik@pobox.com>
* Copyright 2012-2014 pooler <pooler@litecoinpool.org>
* Copyright 2014 Lucas Jones <https://github.com/lucasjones>
* Copyright 2014-2016 Wolf9466 <https://github.com/OhGodAPet>
* Copyright 2016 Jay D Dee <jayddee246@gmail.com>
* Copyright 2016-2017 XMRig <support@xmrig.com>
*
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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#ifndef __MEMORY_H__
#define __MEMORY_H__
#include <windows.h>
#include "options.h"
#include "persistent_memory.h"
char *persistent_memory;
int persistent_memory_flags = 0;
/*****************************************************************
SetLockPagesPrivilege: a function to obtain or
release the privilege of locking physical pages.
Inputs:
HANDLE hProcess: Handle for the process for which the
privilege is needed
BOOL bEnable: Enable (TRUE) or disable?
Return value: TRUE indicates success, FALSE failure.
*****************************************************************/
/**
* AWE Example: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366531(v=vs.85).aspx
* Creating a File Mapping Using Large Pages: https://msdn.microsoft.com/en-us/library/aa366543(VS.85).aspx
*/
static BOOL SetLockPagesPrivilege(HANDLE hProcess, BOOL bEnable) {
struct {
DWORD Count;
LUID_AND_ATTRIBUTES Privilege[1];
} Info;
HANDLE Token;
if (OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES, &Token) != TRUE) {
return FALSE;
}
Info.Count = 1;
Info.Privilege[0].Attributes = bEnable ? SE_PRIVILEGE_ENABLED : 0;
if (LookupPrivilegeValue(NULL, SE_LOCK_MEMORY_NAME, &(Info.Privilege[0].Luid)) != TRUE) {
return FALSE;
}
if (AdjustTokenPrivileges(Token, FALSE, (PTOKEN_PRIVILEGES) &Info, 0, NULL, NULL) != TRUE) {
return FALSE;
}
if (GetLastError() != ERROR_SUCCESS) {
return FALSE;
}
CloseHandle(Token);
return TRUE;
}
const char * persistent_memory_allocate() {
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const int size = MEMORY * (opt_n_threads + 1);
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if (SetLockPagesPrivilege(GetCurrentProcess(), TRUE)) {
persistent_memory_flags |= MEMORY_HUGEPAGES_AVAILABLE;
}
persistent_memory = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE | MEM_LARGE_PAGES, PAGE_READWRITE);
if (!persistent_memory) {
persistent_memory = _mm_malloc(size, 4096);
}
else {
persistent_memory_flags |= MEMORY_HUGEPAGES_ENABLED;
}
return persistent_memory;
}
void persistent_memory_free() {
if (persistent_memory_flags & MEMORY_HUGEPAGES_ENABLED) {
VirtualFree(persistent_memory, 0, MEM_RELEASE);
}
else {
_mm_free(persistent_memory);
}
}
#endif /* __MEMORY_H__ */