82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/*
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* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see
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* http://www.gnu.org/licenses/gpl-2.0.html
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*
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* GPL HEADER END
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*/
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/*
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* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* This file is part of Lustre, http://www.lustre.org/
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* Lustre is a trademark of Sun Microsystems, Inc.
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*
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* libcfs/include/libcfs/libcfs_prim.h
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*
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* General primitives.
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*
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*/
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#ifndef __LIBCFS_PRIM_H__
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#define __LIBCFS_PRIM_H__
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/*
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* Memory
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*/
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#if BITS_PER_LONG == 32
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/* limit to lowmem on 32-bit systems */
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#define NUM_CACHEPAGES \
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min(totalram_pages, 1UL << (30 - PAGE_SHIFT) * 3 / 4)
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#else
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#define NUM_CACHEPAGES totalram_pages
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#endif
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static inline unsigned int memory_pressure_get(void)
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{
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return current->flags & PF_MEMALLOC;
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}
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static inline void memory_pressure_set(void)
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{
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current->flags |= PF_MEMALLOC;
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}
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static inline void memory_pressure_clr(void)
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{
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current->flags &= ~PF_MEMALLOC;
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}
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static inline int cfs_memory_pressure_get_and_set(void)
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{
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int old = memory_pressure_get();
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if (!old)
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memory_pressure_set();
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return old;
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}
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static inline void cfs_memory_pressure_restore(int old)
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{
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if (old)
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memory_pressure_set();
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else
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memory_pressure_clr();
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}
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#endif
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