| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * 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 version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.gnu.org/licenses/gpl-2.0.html |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * libcfs/include/libcfs/libcfs_prim.h |
| * |
| * General primitives. |
| * |
| */ |
| |
| #ifndef __LIBCFS_PRIM_H__ |
| #define __LIBCFS_PRIM_H__ |
| |
| /* |
| * Memory |
| */ |
| #if BITS_PER_LONG == 32 |
| /* limit to lowmem on 32-bit systems */ |
| #define NUM_CACHEPAGES \ |
| min(totalram_pages, 1UL << (30 - PAGE_SHIFT) * 3 / 4) |
| #else |
| #define NUM_CACHEPAGES totalram_pages |
| #endif |
| |
| static inline unsigned int memory_pressure_get(void) |
| { |
| return current->flags & PF_MEMALLOC; |
| } |
| |
| static inline void memory_pressure_set(void) |
| { |
| current->flags |= PF_MEMALLOC; |
| } |
| |
| static inline void memory_pressure_clr(void) |
| { |
| current->flags &= ~PF_MEMALLOC; |
| } |
| |
| static inline int cfs_memory_pressure_get_and_set(void) |
| { |
| int old = memory_pressure_get(); |
| |
| if (!old) |
| memory_pressure_set(); |
| return old; |
| } |
| |
| static inline void cfs_memory_pressure_restore(int old) |
| { |
| if (old) |
| memory_pressure_set(); |
| else |
| memory_pressure_clr(); |
| } |
| #endif |