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/*
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* Copyright (c) 2020 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* $Id: //eng/vdo-releases/aluminum/src/c++/vdo/base/allocationSelector.c#1 $
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*/
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#include "allocationSelector.h"
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#include "allocationSelectorInternals.h"
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#include "memoryAlloc.h"
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#include "types.h"
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enum {
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ALLOCATIONS_PER_ZONE = 128,
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};
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/**********************************************************************/
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int makeAllocationSelector(ZoneCount physicalZoneCount,
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ThreadID threadID,
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AllocationSelector **selectorPtr)
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{
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AllocationSelector *selector;
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int result = ALLOCATE(1, AllocationSelector, __func__, &selector);
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if (result != VDO_SUCCESS) {
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return result;
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}
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*selector = (AllocationSelector) {
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.nextAllocationZone = threadID % physicalZoneCount,
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.lastPhysicalZone = physicalZoneCount - 1,
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};
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*selectorPtr = selector;
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return VDO_SUCCESS;
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}
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/**********************************************************************/
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void freeAllocationSelector(AllocationSelector **selectorPtr)
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{
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AllocationSelector *selector = *selectorPtr;
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if (selector == NULL) {
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return;
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}
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FREE(selector);
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*selectorPtr = NULL;
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}
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/**********************************************************************/
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ZoneCount getNextAllocationZone(AllocationSelector *selector)
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{
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if (selector->lastPhysicalZone > 0) {
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if (selector->allocationCount < ALLOCATIONS_PER_ZONE) {
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selector->allocationCount++;
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} else {
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selector->allocationCount = 1;
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if (selector->nextAllocationZone < selector->lastPhysicalZone) {
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selector->nextAllocationZone++;
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} else {
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selector->nextAllocationZone = 0;
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}
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}
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}
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return selector->nextAllocationZone;
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}
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