diff options
| -rw-r--r-- | net/disk_cache/backend_impl.cc | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/net/disk_cache/backend_impl.cc b/net/disk_cache/backend_impl.cc index be7292d..5f7eb93 100644 --- a/net/disk_cache/backend_impl.cc +++ b/net/disk_cache/backend_impl.cc @@ -8,6 +8,7 @@ #include "base/file_util.h" #include "base/histogram.h" #include "base/message_loop.h" +#include "base/rand_util.h" #include "base/string_util.h" #include "base/sys_info.h" #include "base/timer.h" @@ -139,14 +140,29 @@ bool DelayedCacheCleanup(const std::wstring& full_path) { // Sets |current_group| for the current experiment. Returns false if the files // should be discarded. bool InitExperiment(int* current_group) { - if (*current_group <= 2) { - // Not taking part of this experiment. - *current_group = 5; - } else if (*current_group < 5) { + if (*current_group == 3 || *current_group == 4) { // Discard current cache for groups 3 and 4. return false; } + if (*current_group <= 5) { + // Re-load the two groups. + int option = base::RandInt(0, 9); + + if (option > 1) { + // 80% will be out of the experiment. + *current_group = 9; + } else { + *current_group = option + 6; + } + } + + // The current groups should be: + // 6 control. (~10%) + // 7 new eviction, upgraded data. (~10%) + // 8 new eviction, from new files. + // 9 out. (~80%) + UMA_HISTOGRAM_CACHE_ERROR("DiskCache.Experiment", *current_group); // Current experiment already set. @@ -253,7 +269,7 @@ bool BackendImpl::Init() { if (!InitExperiment(&data_->header.experiment)) return false; - if (data_->header.experiment > 6) + if (data_->header.experiment > 6 && data_->header.experiment < 9) new_eviction_ = true; if (!CheckIndex()) { |