diff options
Diffstat (limited to 'base/process_win.cc')
-rw-r--r-- | base/process_win.cc | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/base/process_win.cc b/base/process_win.cc index 263e577..469e7cd 100644 --- a/base/process_win.cc +++ b/base/process_win.cc @@ -38,77 +38,6 @@ bool Process::SetProcessBackgrounded(bool value) { return (SetPriorityClass(process_, priority) != 0); } -// According to MSDN, these are the default values which XP -// uses to govern working set soft limits. -// http://msdn.microsoft.com/en-us/library/ms686234.aspx -static const int kWinDefaultMinSet = 50 * 4096; -static const int kWinDefaultMaxSet = 345 * 4096; -static const int kDampingFactor = 2; - -bool Process::ReduceWorkingSet() { - if (!process_) - return false; - // The idea here is that when we the process' working set has gone - // down, we want to release those pages to the OS quickly. However, - // when it is not going down, we want to be careful not to release - // too much back to the OS, as it could cause additional paging. - - // We use a damping function to lessen the working set over time. - // As the process grows/shrinks, this algorithm will lag with - // working set reduction. - // - // The intended algorithm is: - // TargetWorkingSetSize = (LastWorkingSet/2 + CurrentWorkingSet) /2 - - scoped_ptr<ProcessMetrics> metrics( - ProcessMetrics::CreateProcessMetrics(process_)); - WorkingSetKBytes working_set; - if (!metrics->GetWorkingSetKBytes(&working_set)) - return false; - - - // We want to compute the amount of working set that the process - // needs to keep in memory. Since other processes contain the - // pages which are shared, we don't need to reserve them in our - // process, the system already has them tagged. Keep in mind, we - // don't get to control *which* pages get released, but if we - // assume reasonable distribution of pages, this should generally - // be the right value. - size_t current_working_set_size = working_set.priv + - working_set.shareable; - - size_t max_size = current_working_set_size; - if (last_working_set_size_) - max_size = (max_size + last_working_set_size_) / 2; // Average. - max_size *= 1024; // Convert to KBytes. - last_working_set_size_ = current_working_set_size / kDampingFactor; - - BOOL rv = SetProcessWorkingSetSize(process_, kWinDefaultMinSet, max_size); - return rv == TRUE; -} - -bool Process::UnReduceWorkingSet() { - if (!process_) - return false; - - if (!last_working_set_size_) - return true; // There was nothing to undo. - - // We've had a reduced working set. Make sure we have lots of - // headroom now that we're active again. - size_t limit = last_working_set_size_ * kDampingFactor * 2 * 1024; - BOOL rv = SetProcessWorkingSetSize(process_, kWinDefaultMinSet, limit); - return rv == TRUE; -} - -bool Process::EmptyWorkingSet() { - if (!process_) - return false; - - BOOL rv = SetProcessWorkingSetSize(process_, -1, -1); - return rv == TRUE; -} - ProcessId Process::pid() const { if (process_ == 0) return 0; |