usr/src/uts/common/sys/mem_cage.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_MEM_CAGE_H
  27 #define _SYS_MEM_CAGE_H
  28
  29 #pragma ident   "%Z%%M% %I%     %E% SMI"
  30
  31 #include <sys/types.h>
  32 #include <sys/memlist.h>
  33
  34 /*
  35  * Memory caging interfaces.
  36  */
  37
  38 #ifdef  __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 #ifdef _KERNEL
  43
  44 #define KCT_FAILURE     0
  45 #define KCT_CRIT        1
  46 #define KCT_NONCRIT     2
  47
  48 extern int kernel_cage_enable;
  49 extern int kcage_on;
  50 extern kthread_id_t kcage_cageout_thread;
  51 extern pgcnt_t kcage_freemem;
  52 extern pgcnt_t kcage_needfree;
  53 extern pgcnt_t kcage_lotsfree;
  54 extern pgcnt_t kcage_desfree;
  55 extern pgcnt_t kcage_minfree;
  56 extern pgcnt_t kcage_throttlefree;
  57
  58 extern void kcage_freemem_add(pgcnt_t);
  59 extern void kcage_freemem_sub(pgcnt_t);
  60 extern int kcage_create_throttle(pgcnt_t, int);
  61
  62 /*
  63  * Control direction of growth: 0: increasing pfns, 1: decreasing.
  64  */
  65 typedef enum {KCAGE_UP, KCAGE_DOWN} kcage_dir_t;
  66 extern void kcage_range_init(struct memlist *, kcage_dir_t, pgcnt_t);
  67 extern int kcage_range_add(pfn_t, pgcnt_t, kcage_dir_t);
  68
  69 extern int kcage_current_pfn(pfn_t *);
  70 extern int kcage_range_delete(pfn_t, pgcnt_t);
  71 extern int kcage_range_delete_post_mem_del(pfn_t, pgcnt_t);
  72
  73 extern void kcage_recalc_thresholds(void);
  74
  75 /* Called from vm_pageout.c */
  76 extern void kcage_cageout_init(void);
  77 extern void kcage_cageout_wakeup(void);
  78
  79 /* Called from clock thread in clock.c */
  80 extern void kcage_tick(void);
  81
  82 /* Called from vm_pagelist.c */
  83 extern int kcage_next_range(int incage,
  84     pfn_t lo, pfn_t hi, pfn_t *nlo, pfn_t *nhi);
  85
  86 extern kcage_dir_t kcage_startup_dir;
  87
  88 #endif /* _KERNEL */
  89
  90 #ifdef  __cplusplus
  91 }
  92 #endif
  93
  94 #endif  /* _SYS_MEM_CAGE_H */