osfmk/kperf/arm/kperf_meminfo.c

   1 /*
   2  * Copyright (c) 2015 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <mach/mach_types.h>
  30 #include <kern/task.h> /* task_ledgers */
  31 #include <kern/thread.h>
  32 #include <kern/ledger.h>
  33
  34 #include <kperf/kperf_arch.h>
  35
  36 kern_return_t
  37 kperf_get_phys_footprint(task_t task, uint64_t *phys_footprint_out)
  38 {
  39         kern_return_t kr;
  40         ledger_amount_t credit, debit;
  41         uint64_t phys_footprint;
  42
  43         kr = ledger_get_entries(task->ledger, task_ledgers.phys_footprint,
  44                                 &credit, &debit);
  45         if (kr == KERN_SUCCESS) {
  46                 phys_footprint = credit - debit;
  47         } else {
  48                 return kr;
  49         }
  50
  51         *phys_footprint_out = phys_footprint;
  52         return KERN_SUCCESS;
  53 }
  54