Introduce hard mode when we are OOM

Start killing documents when memory usage goes above threshold.

Also make it possible to close documents from admin instance.
In DocumentBroker::closeDocument, just set the _stop flag and wake
up the polling thread which will terminate the children, instead of
manually terminating the children.

Change-Id: Ie70e05b3fb6ea816a87b6dcfaed92cdddb94aa90

1 files changed, 5 insertions, 0 deletions

diff --git a/wsd/Admin.hpp b/wsd/Admin.hpp
index d5b62cb8d7..54b9a8e76b 100644
--- a/wsd/Admin.hpp
+++ b/wsd/Admin.hpp
@@ -118,6 +118,10 @@ private:
     /// Notify Forkit of changed settings.
     void notifyForkit();
 
+    /// Memory consumption has increased, start killing kits etc. till memory consumption gets back
+    /// under @hardModeLimit
+    void triggerMemoryCleanup(size_t hardModeLimit);
+
 private:
     /// The model is accessed only during startup & in
     /// the Admin Poll thread.
@@ -128,6 +132,7 @@ private:
     size_t _lastJiffies;
     uint64_t _lastSentCount;
     uint64_t _lastRecvCount;
+    size_t _totalSysMem;
 
     std::atomic<int> _memStatsTaskIntervalMs;
     std::atomic<int> _cpuStatsTaskIntervalMs;