mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-24 08:30:21 +00:00
b2a52f6208
By designating a committed page pool we can guarantee to have physical pages available for lazy allocation in mappings. However, when forking we will overcommit. The assumption is that worst-case it's better for the fork to die due to insufficient physical memory on COW access than the parent that created the region. If a fork wants to ensure that all memory is available (trigger a commit) then it can use madvise. This also means that fork now can gracefully fail if we don't have enough physical pages available.
56 lines
2 KiB
C++
56 lines
2 KiB
C++
/*
|
|
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <Kernel/FileSystem/Inode.h>
|
|
#include <Kernel/VM/PrivateInodeVMObject.h>
|
|
|
|
namespace Kernel {
|
|
|
|
NonnullRefPtr<PrivateInodeVMObject> PrivateInodeVMObject::create_with_inode(Inode& inode)
|
|
{
|
|
return adopt(*new PrivateInodeVMObject(inode, inode.size()));
|
|
}
|
|
|
|
RefPtr<VMObject> PrivateInodeVMObject::clone()
|
|
{
|
|
return adopt(*new PrivateInodeVMObject(*this));
|
|
}
|
|
|
|
PrivateInodeVMObject::PrivateInodeVMObject(Inode& inode, size_t size)
|
|
: InodeVMObject(inode, size)
|
|
{
|
|
}
|
|
|
|
PrivateInodeVMObject::PrivateInodeVMObject(const PrivateInodeVMObject& other)
|
|
: InodeVMObject(other)
|
|
{
|
|
}
|
|
|
|
PrivateInodeVMObject::~PrivateInodeVMObject()
|
|
{
|
|
}
|
|
|
|
}
|