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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Diagnostics.Tracing;
namespace System.Buffers
{
[EventSource(Guid = "0866B2B8-5CEF-5DB9-2612-0C0FFD814A44", Name = "System.Buffers.ArrayPoolEventSource")]
internal sealed class ArrayPoolEventSource : EventSource
{
internal readonly static ArrayPoolEventSource Log = new ArrayPoolEventSource();
/// <summary>The reason for a BufferAllocated event.</summary>
internal enum BufferAllocatedReason : int
{
/// <summary>The pool is allocating a buffer to be pooled in a bucket.</summary>
Pooled,
/// <summary>The requested buffer size was too large to be pooled.</summary>
OverMaximumSize,
/// <summary>The pool has already allocated for pooling as many buffers of a particular size as it's allowed.</summary>
PoolExhausted
}
// The ArrayPoolEventSource GUID is {0866b2b8-5cef-5db9-2612-0c0ffd814a44}
private ArrayPoolEventSource() : base(new Guid(0x0866b2b8, 0x5cef, 0x5db9, 0x26, 0x12, 0x0c, 0x0f, 0xfd, 0x81, 0x4a, 0x44), "System.Buffers.ArrayPoolEventSource") { }
/// <summary>
/// Event for when a buffer is rented. This is invoked once for every successful call to Rent,
/// regardless of whether a buffer is allocated or a buffer is taken from the pool. In a
/// perfect situation where all rented buffers are returned, we expect to see the number
/// of BufferRented events exactly match the number of BuferReturned events, with the number
/// of BufferAllocated events being less than or equal to those numbers (ideally significantly
/// less than).
/// </summary>
[Event(1, Level = EventLevel.Verbose)]
internal unsafe void BufferRented(int bufferId, int bufferSize, int poolId, int bucketId)
{
EventData* payload = stackalloc EventData[4];
payload[0].Size = sizeof(int);
payload[0].DataPointer = ((IntPtr)(&bufferId));
payload[0].Reserved = 0;
payload[1].Size = sizeof(int);
payload[1].DataPointer = ((IntPtr)(&bufferSize));
payload[1].Reserved = 0;
payload[2].Size = sizeof(int);
payload[2].DataPointer = ((IntPtr)(&poolId));
payload[2].Reserved = 0;
payload[3].Size = sizeof(int);
payload[3].DataPointer = ((IntPtr)(&bucketId));
payload[3].Reserved = 0;
WriteEventCore(1, 4, payload);
}
/// <summary>
/// Event for when a buffer is allocated by the pool. In an ideal situation, the number
/// of BufferAllocated events is significantly smaller than the number of BufferRented and
/// BufferReturned events.
/// </summary>
[Event(2, Level = EventLevel.Informational)]
internal unsafe void BufferAllocated(int bufferId, int bufferSize, int poolId, int bucketId, BufferAllocatedReason reason)
{
EventData* payload = stackalloc EventData[5];
payload[0].Size = sizeof(int);
payload[0].DataPointer = ((IntPtr)(&bufferId));
payload[0].Reserved = 0;
payload[1].Size = sizeof(int);
payload[1].DataPointer = ((IntPtr)(&bufferSize));
payload[1].Reserved = 0;
payload[2].Size = sizeof(int);
payload[2].DataPointer = ((IntPtr)(&poolId));
payload[2].Reserved = 0;
payload[3].Size = sizeof(int);
payload[3].DataPointer = ((IntPtr)(&bucketId));
payload[3].Reserved = 0;
payload[4].Size = sizeof(BufferAllocatedReason);
payload[4].DataPointer = ((IntPtr)(&reason));
payload[4].Reserved = 0;
WriteEventCore(2, 5, payload);
}
/// <summary>
/// Event raised when a buffer is returned to the pool. This event is raised regardless of whether
/// the returned buffer is stored or dropped. In an ideal situation, the number of BufferReturned
/// events exactly matches the number of BufferRented events.
/// </summary>
[Event(3, Level = EventLevel.Verbose)]
internal void BufferReturned(int bufferId, int bufferSize, int poolId) => WriteEvent(3, bufferId, bufferSize, poolId);
/// <summary>
/// Event raised when we attempt to free a buffer due to inactivity or memory pressure (by no longer
/// referencing it). It is possible (although not commmon) this buffer could be rented as we attempt
/// to free it. A rent event before or after this event for the same ID, is a rare, but expected case.
/// </summary>
[Event(4, Level = EventLevel.Informational)]
internal void BufferTrimmed(int bufferId, int bufferSize, int poolId) => WriteEvent(4, bufferId, bufferSize, poolId);
/// <summary>
/// Event raised when we check to trim buffers.
/// </summary>
[Event(5, Level = EventLevel.Informational)]
internal void BufferTrimPoll(int milliseconds, int pressure) => WriteEvent(5, milliseconds, pressure);
}
}
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