LU-9859 libcfs: simplify linux-prim.c

[fs/lustre-release.git] / libcfs / include / libcfs / libcfs_prim.h

diff --git a/libcfs/include/libcfs/libcfs_prim.h b/libcfs/include/libcfs/libcfs_prim.h
index 8dca0a9..50ed7b9 100644 (file)
--- a/libcfs/include/libcfs/libcfs_prim.h
+++ b/libcfs/include/libcfs/libcfs_prim.h
@@ -1,6 +1,4 @@
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
  * GPL HEADER START
  *
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
@@ -17,16 +15,12 @@
  *
  * You should have received a copy of the GNU General Public License
  * version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
  *
  * GPL HEADER END
  */
 /*
- * Copyright  2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  */
 /*
@@ -42,42 +36,49 @@
 #ifndef __LIBCFS_PRIM_H__
 #define __LIBCFS_PRIM_H__
 
-/*
- * Schedule
- */
-void cfs_schedule_timeout(cfs_task_state_t state, int64_t timeout);
-void cfs_schedule(void);
-void cfs_pause(cfs_duration_t ticks);
-int  cfs_need_resched(void);
-void cfs_cond_resched(void);
+#include <linux/mm.h>
+#include <linux/sched.h>
 
 /*
- * Wait Queues
+ * Memory
  */
-void cfs_waitq_init(cfs_waitq_t *waitq);
-void cfs_waitlink_init(cfs_waitlink_t *link);
-void cfs_waitq_add(cfs_waitq_t *waitq, cfs_waitlink_t *link);
-void cfs_waitq_add_exclusive(cfs_waitq_t *waitq, 
-                             cfs_waitlink_t *link);
-void cfs_waitq_del(cfs_waitq_t *waitq, cfs_waitlink_t *link);
-int  cfs_waitq_active(cfs_waitq_t *waitq);
-void cfs_waitq_signal(cfs_waitq_t *waitq);
-void cfs_waitq_signal_nr(cfs_waitq_t *waitq, int nr);
-void cfs_waitq_broadcast(cfs_waitq_t *waitq);
-void cfs_waitq_wait(cfs_waitlink_t *link, cfs_task_state_t state);
-int64_t cfs_waitq_timedwait(cfs_waitlink_t *link, cfs_task_state_t state, 
-                           int64_t timeout);
+#if BITS_PER_LONG == 32
+/* limit to lowmem on 32-bit systems */
+# define NUM_CACHEPAGES \
+       min(cfs_totalram_pages(), 1UL << (30 - PAGE_SHIFT) * 3 / 4)
+#else
+# define NUM_CACHEPAGES cfs_totalram_pages()
+#endif
 
-/*
- * Timer
- */
-typedef  void (cfs_timer_func_t)(ulong_ptr_t);
+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;
+}
 
-void cfs_init_timer(cfs_timer_t *t);
-void cfs_timer_init(cfs_timer_t *t, cfs_timer_func_t *func, void *arg);
-void cfs_timer_done(cfs_timer_t *t);
-void cfs_timer_arm(cfs_timer_t *t, cfs_time_t deadline);
-void cfs_timer_disarm(cfs_timer_t *t);
-int  cfs_timer_is_armed(cfs_timer_t *t);
-cfs_time_t cfs_timer_deadline(cfs_timer_t *t);
+static inline void cfs_memory_pressure_restore(int old)
+{
+       if (old)
+               memory_pressure_set();
+       else
+               memory_pressure_clr();
+}
 #endif