Leaked source code of windows server 2003
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/*++
Copyright (c) 2001 Microsoft Corporation
Module Name:
setlog.c
Abstract:
This module contains code to enable/disable performance logging. This
routine is platform specific to optimize cache usage.
Author:
David N. Cutler (davec) 8-Sep-2001
Environment:
Kernel mode only.
Revision History:
--*/
#include "perfp.h"
VOID
PerfSetLogging (
IN PVOID MaskAddress
)
/*++
Routine Description:
This function is called to enable (MaskAddress is nonNULL) or disable
(MaskAddress is NULL) performance data collection at context switches.
Arguments:
MaskAddress - Supplies a pointer to the performance logging mask or
NULL.
Return Value:
None.
--*/
{
ULONG Index;
PKPCR Pcr;
PKPRCB Prcb;
//
// Store the specified mask address in the stack limit field of the PCR
// for each processor in the configuation.
//
for (Index = 0; Index < (ULONG)KeNumberProcessors; Index += 1) {
Prcb = KiProcessorBlock[Index];
Pcr = CONTAINING_RECORD(Prcb, KPCR, PrcbData);
Pcr->PerfGlobalGroupMask = MaskAddress;
}
return;
}