{"action":"created","comment":{"url":"https://api.github.com/repos/dotnet/coreclr/pulls/comments/177852676","pull_request_review_id":107803808,"id":177852676,"diff_hunk":"@@ -203,6 +224,112 @@ public override void Return(T[] array, bool clearArray = false)\n             }\n         }\n \n+        public bool Trim()\n+        {\n+            uint tickCount = (uint)Environment.TickCount;\n+\n+            MemoryPressure pressure = GetMemoryPressure();\n+            foreach (PerCoreLockedStacks bucket in _buckets)\n+            {\n+                bucket?.Trim(tickCount, Id, pressure);\n+            }\n+\n+            ArrayPoolEventSource log = ArrayPoolEventSource.Log;\n+            uint trimTicks = pressure == MemoryPressure.High ? TlsHighTrimAfterTicks : TlsTrimAfterTicks;\n+            foreach (var tlsBuckets in s_allTlsBuckets)\n+            {\n+                Bucket[] buckets = tlsBuckets.Key;\n+                for (int i = 0; i < NumBuckets; i++)\n+                {\n+                    uint stockTicks = buckets[i].Ticks;\n+                    if (stockTicks > tickCount || (tickCount - stockTicks) > trimTicks)\n+                    {\n+                        T[] buffer = buckets[i].Buffer;\n+\n+                        // We've wrapped the tick count or elapsed enough time since the\n+                        // first item went into this thread local bucket. Clear it.\n+                        buckets[i].Buffer = null;\n+\n+                        if (log.IsEnabled() && buffer != null)\n+                        {\n+                            log.BufferTrimmed(buffer.GetHashCode(), buffer.Length, Id);\n+                        }\n+                    }\n+                }\n+            }\n+\n+            return true;\n+        }\n+\n+        /// <summary>\n+        /// This is the static function that is called from the gen2 GC callback.\n+        /// The input object is the instance we want the callback on.\n+        /// </summary>\n+        /// <remarks>\n+        /// The reason that we make this function static and take the instance as a parameter is that\n+        /// we would otherwise root the instance to the Gen2GcCallback object, leaking the instance even when\n+        /// the application no longer needs it.\n+        /// </remarks>\n+        private static bool Gen2GcCallbackFunc(object target)\n+        {\n+            return ((TlsOverPerCoreLockedStacksArrayPool<T>)(target)).Trim();\n+        }\n+\n+        private enum MemoryPressure\n+        {\n+            Low,\n+            Medium,\n+            High\n+        }\n+\n+        private static MemoryPressure GetMemoryPressure()\n+        {\n+            GC.GetMemoryInfo(out uint threshold, out _, out uint lastLoad, out _, out _);\n+            if (lastLoad >= threshold * .90)\n+            {\n+                return MemoryPressure.High;\n+            }\n+            else if (lastLoad >= threshold * .80)","path":"src/mscorlib/shared/System/Buffers/TlsOverPerCoreLockedStacksArrayPool.cs","position":164,"original_position":164,"commit_id":"3791e26adc27a0fd8e82d1ec8849959d9041fc19","original_commit_id":"be8e103b9635c82c866b428d2d433903b97bdf05","user":{"login":"bartonjs","id":10642668,"avatar_url":"https://avatars3.githubusercontent.com/u/10642668?v=4","gravatar_id":"","url":"https://api.github.com/users/bartonjs","html_url":"https://github.com/bartonjs","followers_url":"https://api.github.com/users/bartonjs/followers","following_url":"https://api.github.com/users/bartonjs/following{/other_user}","gists_url":"https://api.github.com/users/bartonjs/gists{/gist_id}","starred_url":"https://api.github.com/users/bartonjs/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bartonjs/subscriptions","organizations_url":"https://api.github.com/users/bartonjs/orgs","repos_url":"https://api.github.com/users/bartonjs/repos","events_url":"https://api.github.com/users/bartonjs/events{/privacy}","received_events_url":"https://api.github.com/users/bartonjs/received_events","type":"User","site_admin":false},"body":"I don't have a strong preference either way, I just was surprised and conveying that.  Some of the other constants (StackHighTrimAfter, Stack{Low|Medium|High}TrimCount) also seem to be used only once.  So I guess I was also conveying an inconsistency.","created_at":"2018-03-28T18:46:02Z","updated_at":"2018-03-28T18:46:03Z","html_url":"https://github.com/dotnet/coreclr/pull/17078#discussion_r177852676","pull_request_url":"https://api.github.com/repos/dotnet/coreclr/pulls/17078","author_association":"MEMBER","_links":{"self":{"href":"https://api.github.com/repos/dotnet/coreclr/pulls/comments/177852676"},"html":{"href":"https://github.com/dotnet/coreclr/pull/17078#discussion_r177852676"},"pull_request":{"href":"https://api.github.com/repos/dotnet/coreclr/pulls/17078"}},"in_reply_to_id":177620031},"pull_request":{"url":"https://api.github.com/repos/dotnet/coreclr/pulls/17078","id":176344303,"html_url":"https://github.com/dotnet/coreclr/pull/17078","diff_url":"https://github.com/dotnet/coreclr/pull/17078.diff","patch_url":"https://github.com/dotnet/coreclr/pull/17078.patch","issue_url":"https://api.github.com/repos/dotnet/coreclr/issues/17078","number":17078,"state":"open","locked":false,"title":"Simple trim of ArrayPool buffers","user":{"login":"JeremyKuhne","id":8184940,"avatar_url":"https://avatars3.githubusercontent.com/u/8184940?v=4","gravatar_id":"","url":"https://api.github.com/users/JeremyKuhne","html_url":"https://github.com/JeremyKuhne","followers_url":"https://api.github.com/users/JeremyKuhne/followers","following_url":"https://api.github.com/users/JeremyKuhne/following{/other_user}","gists_url":"https://api.github.com/users/JeremyKuhne/gists{/gist_id}","starred_url":"https://api.github.com/users/JeremyKuhne/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JeremyKuhne/subscriptions","organizations_url":"https://api.github.com/users/JeremyKuhne/orgs","repos_url":"https://api.github.com/users/JeremyKuhne/repos","events_url":"https://api.github.com/users/JeremyKuhne/events{/privacy}","received_events_url":"https://api.github.com/users/JeremyKuhne/received_events","type":"User","site_admin":false},"body":"Trim ArrayPool buffers on Gen2 GC if the buffer stack hasn't been emptied for awhile. If you haven't pulled all of the buffers in the past 10 seconds, let loose the top buffer on the stack and give the stack another 2 seconds of potential life. When the stack gets it's bottom buffer returned the clock resets.\r\n\r\nThis is taking clues from PinnableBufferCache, which has been split into separate files and tweaked for coding standards. Trying to introduce as little overhead/complexity as possible...\r\n\r\nIf this is a reasonable approach we may want to consider unifying on the Tls pool. I can potentially make a similar change to the other pool implementation.\r\n\r\ncc: @danmosemsft","created_at":"2018-03-20T22:51:59Z","updated_at":"2018-03-28T18:46:03Z","closed_at":null,"merged_at":null,"merge_commit_sha":"fa9ff1712ba0adea2d4d4793af11b66b52fac399","assignee":null,"assignees":[],"requested_reviewers":[{"login":"stephentoub","id":2642209,"avatar_url":"https://avatars0.githubusercontent.com/u/2642209?v=4","gravatar_id":"","url":"https://api.github.com/users/stephentoub","html_url":"https://github.com/stephentoub","followers_url":"https://api.github.com/users/stephentoub/followers","following_url":"https://api.github.com/users/stephentoub/following{/other_user}","gists_url":"https://api.github.com/users/stephentoub/gists{/gist_id}","starred_url":"https://api.github.com/users/stephentoub/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/stephentoub/subscriptions","organizations_url":"https://api.github.com/users/stephentoub/orgs","repos_url":"https://api.github.com/users/stephentoub/repos","events_url":"https://api.github.com/users/stephentoub/events{/privacy}","received_events_url":"https://api.github.com/users/stephentoub/received_events","type":"User","site_admin":false},{"login":"brianrob","id":6210322,"avatar_url":"https://avatars0.githubusercontent.com/u/6210322?v=4","gravatar_id":"","url":"https://api.github.com/users/brianrob","html_url":"https://github.com/brianrob","followers_url":"https://api.github.com/users/brianrob/followers","following_url":"https://api.github.com/users/brianrob/following{/other_user}","gists_url":"https://api.github.com/users/brianrob/gists{/gist_id}","starred_url":"https://api.github.com/users/brianrob/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/brianrob/subscriptions","organizations_url":"https://api.github.com/users/brianrob/orgs","repos_url":"https://api.github.com/users/brianrob/repos","events_url":"https://api.github.com/users/brianrob/events{/privacy}","received_events_url":"https://api.github.com/users/brianrob/received_events","type":"User","site_admin":false},{"login":"Maoni0","id":10837357,"avatar_url":"https://avatars1.githubusercontent.com/u/10837357?v=4","gravatar_id":"","url":"https://api.github.com/users/Maoni0","html_url":"https://github.com/Maoni0","followers_url":"https://api.github.com/users/Maoni0/followers","following_url":"https://api.github.com/users/Maoni0/following{/other_user}","gists_url":"https://api.github.com/users/Maoni0/gists{/gist_id}","starred_url":"https://api.github.com/users/Maoni0/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Maoni0/subscriptions","organizations_url":"https://api.github.com/users/Maoni0/orgs","repos_url":"https://api.github.com/users/Maoni0/repos","events_url":"https://api.github.com/users/Maoni0/events{/privacy}","received_events_url":"https://api.github.com/users/Maoni0/received_events","type":"User","site_admin":false}],"requested_teams":[],"labels":[],"milestone":{"url":"https://api.github.com/repos/dotnet/coreclr/milestones/10","html_url":"https://github.com/dotnet/coreclr/milestone/10","labels_url":"https://api.github.com/repos/dotnet/coreclr/milestones/10/labels","id":2344332,"number":10,"title":"2.1.0","description":".NET Core 2.1, next major release. 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