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Kernel+LibC: Make all SharedBuffers purgeable (default: non-volatile)

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This patch makes SharedBuffer use a PurgeableVMObject as its underlying
memory object.

A new syscall is added to control the volatile flag of a SharedBuffer.
This commit is contained in:
Andreas Kling 2019-12-09 20:06:47 +01:00
parent 65229a4082
commit 0317ca5ccc
6 changed files with 50 additions and 5 deletions
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22
Kernel/Process.cpp
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@ -2909,6 +2909,28 @@ int Process::sys$get_shared_buffer_size(int shared_buffer_id)
return shared_buffer.size();
}
int Process::sys$set_shared_buffer_volatile(int shared_buffer_id, bool state)
{
LOCKER(shared_buffers().lock());
auto it = shared_buffers().resource().find(shared_buffer_id);
if (it == shared_buffers().resource().end())
return -EINVAL;
auto& shared_buffer = *(*it).value;
if (!shared_buffer.is_shared_with(m_pid))
return -EPERM;
#ifdef SHARED_BUFFER_DEBUG
kprintf("%s(%u): Set shared buffer %d volatile: %u\n", name().characters(), pid(), shared_buffer_id, state);
#endif
if (!state) {
bool was_purged = shared_buffer.vmobject().was_purged();
shared_buffer.vmobject().set_volatile(state);
shared_buffer.vmobject().set_was_purged(false);
return was_purged ? 1 : 0;
}
shared_buffer.vmobject().set_volatile(true);
return 0;
}
void Process::terminate_due_to_signal(u8 signal)
{
ASSERT_INTERRUPTS_DISABLED();