third_party/tcmalloc/chromium/src/tests/markidle_unittest.cc

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  29
  30 // ---
  31 // Author: Sanjay Ghemawat
  32 //
  33 // MallocExtension::MarkThreadIdle() testing
  34 #include <stdio.h>
  35
  36 #include "config_for_unittests.h"
  37 #include "base/logging.h"
  38 #include <gperftools/malloc_extension.h>
  39 #include "tests/testutil.h"   // for RunThread()
  40
  41 // Helper routine to do lots of allocations
  42 static void TestAllocation() {
  43   static const int kNum = 100;
  44   void* ptr[kNum];
  45   for (int size = 8; size <= 65536; size*=2) {
  46     for (int i = 0; i < kNum; i++) {
  47       ptr[i] = malloc(size);
  48     }
  49     for (int i = 0; i < kNum; i++) {
  50       free(ptr[i]);
  51     }
  52   }
  53 }
  54
  55 // Routine that does a bunch of MarkThreadIdle() calls in sequence
  56 // without any intervening allocations
  57 static void MultipleIdleCalls() {
  58   for (int i = 0; i < 4; i++) {
  59     MallocExtension::instance()->MarkThreadIdle();
  60   }
  61 }
  62
  63 // Routine that does a bunch of MarkThreadIdle() calls in sequence
  64 // with intervening allocations
  65 static void MultipleIdleNonIdlePhases() {
  66   for (int i = 0; i < 4; i++) {
  67     TestAllocation();
  68     MallocExtension::instance()->MarkThreadIdle();
  69   }
  70 }
  71
  72 // Get current thread cache usage
  73 static size_t GetTotalThreadCacheSize() {
  74   size_t result;
  75   CHECK(MallocExtension::instance()->GetNumericProperty(
  76             "tcmalloc.current_total_thread_cache_bytes",
  77             &result));
  78   return result;
  79 }
  80
  81 // Check that MarkThreadIdle() actually reduces the amount
  82 // of per-thread memory.
  83 static void TestIdleUsage() {
  84   const size_t original = GetTotalThreadCacheSize();
  85
  86   TestAllocation();
  87   const size_t post_allocation = GetTotalThreadCacheSize();
  88   CHECK_GT(post_allocation, original);
  89
  90   MallocExtension::instance()->MarkThreadIdle();
  91   const size_t post_idle = GetTotalThreadCacheSize();
  92   CHECK_LE(post_idle, original);
  93
  94   // Log after testing because logging can allocate heap memory.
  95   VLOG(0, "Original usage: %"PRIuS"\n", original);
  96   VLOG(0, "Post allocation: %"PRIuS"\n", post_allocation);
  97   VLOG(0, "Post idle: %"PRIuS"\n", post_idle);
  98 }
  99
 100 int main(int argc, char** argv) {
 101   RunThread(&TestIdleUsage);
 102   RunThread(&TestAllocation);
 103   RunThread(&MultipleIdleCalls);
 104   RunThread(&MultipleIdleNonIdlePhases);
 105
 106   printf("PASS\n");
 107   return 0;
 108 }