osfmk/kperf/meminfo.c

   1 /*
   2  * Copyright (c) 2011 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/ledger.h>
  32
  33 #include <kperf/kperf.h>
  34
  35 #include <kperf/buffer.h>
  36 #include <kperf/context.h>
  37 #include <kperf/meminfo.h>
  38
  39 /* collect current memory info */
  40 void
  41 kperf_meminfo_sample(task_t task, struct meminfo *mi)
  42 {
  43         ledger_amount_t credit, debit;
  44         kern_return_t kr;
  45
  46         assert(mi != NULL);
  47
  48         BUF_INFO(PERF_MI_SAMPLE | DBG_FUNC_START);
  49
  50         mi->phys_footprint = get_task_phys_footprint(task);
  51
  52         kr = ledger_get_entries(task->ledger, task_ledgers.purgeable_volatile,
  53                                 &credit, &debit);
  54         if (kr == KERN_SUCCESS) {
  55                 mi->purgeable_volatile = credit - debit;
  56         } else {
  57                 mi->purgeable_volatile = UINT64_MAX;
  58         }
  59
  60         kr = ledger_get_entries(task->ledger,
  61                                 task_ledgers.purgeable_volatile_compressed,
  62                                 &credit, &debit);
  63         if (kr == KERN_SUCCESS) {
  64                 mi->purgeable_volatile_compressed = credit - debit;
  65         } else {
  66                 mi->purgeable_volatile_compressed = UINT64_MAX;
  67         }
  68
  69         BUF_INFO(PERF_MI_SAMPLE | DBG_FUNC_END);
  70 }
  71
  72 /* log an existing sample into the buffer */
  73 void
  74 kperf_meminfo_log(struct meminfo *mi)
  75 {
  76         BUF_DATA(PERF_MI_DATA, mi->phys_footprint, mi->purgeable_volatile,
  77                  mi->purgeable_volatile_compressed);
  78 }