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/thread.h>
  32 #include <kern/ledger.h>
  33
  34 #include <kperf/kperf.h>
  35 #include <kperf/kperf_arch.h>
  36
  37 #include <kperf/buffer.h>
  38 #include <kperf/context.h>
  39 #include <kperf/meminfo.h>
  40
  41 /* collect current memory info */
  42 void
  43 kperf_meminfo_sample(struct meminfo *mi, struct kperf_context *context)
  44 {
  45         task_t task;
  46         ledger_amount_t credit, debit;
  47         uint64_t phys_footprint;
  48         kern_return_t kr;
  49
  50         assert(mi);
  51         assert(context);
  52
  53         thread_t thread = context->cur_thread;
  54
  55         BUF_INFO(PERF_MI_SAMPLE | DBG_FUNC_START, (uintptr_t)thread_tid(thread));
  56
  57         task = get_threadtask(thread);
  58
  59         kr = kperf_get_phys_footprint(task, &phys_footprint);
  60         if (kr == KERN_SUCCESS) {
  61                 mi->phys_footprint = phys_footprint;
  62         } else {
  63                 mi->phys_footprint = UINT64_MAX;
  64         }
  65
  66         kr = ledger_get_entries(task->ledger, task_ledgers.purgeable_volatile,
  67                                 &credit, &debit);
  68         if (kr == KERN_SUCCESS) {
  69                 mi->purgeable_volatile = credit - debit;
  70         } else {
  71                 mi->purgeable_volatile = UINT64_MAX;
  72         }
  73
  74         kr = ledger_get_entries(task->ledger,
  75                                 task_ledgers.purgeable_volatile_compressed,
  76                                 &credit, &debit);
  77         if (kr == KERN_SUCCESS) {
  78                 mi->purgeable_volatile_compressed = credit - debit;
  79         } else {
  80                 mi->purgeable_volatile_compressed = UINT64_MAX;
  81         }
  82
  83         BUF_INFO(PERF_MI_SAMPLE | DBG_FUNC_END, (uintptr_t)thread_tid(thread));
  84 }
  85
  86 /* log an existing sample into the buffer */
  87 void
  88 kperf_meminfo_log(struct meminfo *mi)
  89 {
  90         BUF_DATA(PERF_MI_DATA, mi->phys_footprint, mi->purgeable_volatile,
  91                  mi->purgeable_volatile_compressed);
  92 }
  93