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MdeModulePkg: Remove event from protocol database only if registered

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In a CloseEvent, an UnregisterProtocolNotify is done unconditionally.
There is a penalty associated with searching the protocol database on
every CloseEvent and impacts performance, especially during Network IO.
Unregister needs to be done only if the Event is for a RegisterProtocolNotify.

So extend the ExFlag in IEVENT to a UINT8 and define new flags that can
be set to indicate if the Event is part of a group, or registered on a
protocol notify. Then in CloseEvent, call UnregisterProtocolNotify only
if the register protocol notify flag is set.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Samer El-Haj-Mahmoud <samer.el-haj-mahmoud@hpe.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18517 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Samer El-Haj-Mahmoud
2015-09-21 01:53:34 +00:00
committed by erictian
parent e630f8595a
commit 82f3edf26a
3 changed files with 19 additions and 6 deletions
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9
MdeModulePkg/Core/Dxe/Event/Event.c
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@ -2,6 +2,7 @@
UEFI Event support functions implemented in this file.
Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -477,7 +478,7 @@ CoreCreateEventInternal (
IEvent->NotifyContext = (VOID *)NotifyContext;
if (EventGroup != NULL) {
CopyGuid (&IEvent->EventGroup, EventGroup);
IEvent->ExFlag = TRUE;
IEvent->ExFlag |= EVT_EXFLAG_EVENT_GROUP;
}
*Event = IEvent;
@ -554,7 +555,7 @@ CoreSignalEvent (
// If signalling type is a notify function, queue it
//
if ((Event->Type & EVT_NOTIFY_SIGNAL) != 0) {
if (Event->ExFlag) {
if ((Event->ExFlag & EVT_EXFLAG_EVENT_GROUP) != 0) {
//
// The CreateEventEx() style requires all members of the Event Group
// to be signaled.
@ -764,7 +765,9 @@ CoreCloseEvent (
//
// If the event is registered on a protocol notify, then remove it from the protocol database
//
CoreUnregisterProtocolNotify (Event);
if ((Event->ExFlag & EVT_EXFLAG_EVENT_PROTOCOL_NOTIFICATION) != 0) {
CoreUnregisterProtocolNotify (Event);
}
Status = CoreFreePool (Event);
ASSERT_EFI_ERROR (Status);