4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
27 * This file is part of Lustre, http://www.lustre.org/
28 * Lustre is a trademark of Sun Microsystems, Inc.
30 * libcfs/include/libcfs/libcfs_prim.h
36 #ifndef __LIBCFS_PRIM_H__
37 #define __LIBCFS_PRIM_H__
39 #include <linux/sched.h>
44 typedef void (cfs_timer_func_t)(uintptr_t);
46 void cfs_init_timer(struct timer_list *t);
47 void cfs_timer_init(struct timer_list *t, cfs_timer_func_t *func, void *arg);
48 void cfs_timer_arm(struct timer_list *t, cfs_time_t deadline);
49 void cfs_timer_disarm(struct timer_list *t);
50 int cfs_timer_is_armed(struct timer_list *t);
51 cfs_time_t cfs_timer_deadline(struct timer_list *t);
56 #if BITS_PER_LONG == 32
57 /* limit to lowmem on 32-bit systems */
58 # define NUM_CACHEPAGES \
59 min(totalram_pages, 1UL << (30 - PAGE_SHIFT) * 3 / 4)
61 # define NUM_CACHEPAGES totalram_pages
64 static inline unsigned int memory_pressure_get(void)
66 return current->flags & PF_MEMALLOC;
69 static inline void memory_pressure_set(void)
71 current->flags |= PF_MEMALLOC;
74 static inline void memory_pressure_clr(void)
76 current->flags &= ~PF_MEMALLOC;
79 static inline int cfs_memory_pressure_get_and_set(void)
81 int old = memory_pressure_get();
84 memory_pressure_set();
88 static inline void cfs_memory_pressure_restore(int old)
91 memory_pressure_set();
93 memory_pressure_clr();