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// extent_manager.cpp
/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/storage/mmap_v1/extent_manager.h"
#include "mongo/db/storage/mmap_v1/extent.h"
namespace mongo {
int ExtentManager::quantizeExtentSize( int size ) const {
if ( size == maxSize() ) {
// no point doing quantizing for the entire file
return size;
}
invariant( size <= maxSize() );
// make sizes align with VM page size
int newSize = (size + 0xfff) & 0xfffff000;
if ( newSize > maxSize() ) {
return maxSize();
}
if ( newSize < minSize() ) {
return minSize();
}
return newSize;
}
int ExtentManager::followupSize( int len, int lastExtentLen ) const {
invariant( len < maxSize() );
int x = initialSize(len);
// changed from 1.20 to 1.35 in v2.1.x to get to larger extent size faster
int y = (int) (lastExtentLen < 4000000 ? lastExtentLen * 4.0 : lastExtentLen * 1.35);
int sz = y > x ? y : x;
if ( sz < lastExtentLen ) {
// this means there was an int overflow
// so we should turn it into maxSize
return maxSize();
}
else if ( sz > maxSize() ) {
return maxSize();
}
sz = quantizeExtentSize( sz );
verify( sz >= len );
return sz;
}
int ExtentManager::initialSize( int len ) const {
invariant( len <= maxSize() );
long long sz = len * 16;
if ( len < 1000 )
sz = len * 64;
if ( sz >= maxSize() )
return maxSize();
if ( sz <= minSize() )
return minSize();
int z = ExtentManager::quantizeExtentSize( sz );
verify( z >= len );
return z;
}
}
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