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Kernel: Steer away from heap allocations for ProcFS process data

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Instead, use more static patterns to acquire that sort of data.
This commit is contained in:
Liav A 2021-08-10 20:51:28 +03:00 • committed by Andreas Kling
parent bf1adc2d5d
commit 7ba991dc37
11 changed files with 991 additions and 879 deletions
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34
Kernel/GlobalProcessExposed.cpp
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@ -27,6 +27,7 @@
#include <Kernel/Net/Routing.h>
#include <Kernel/Net/TCPSocket.h>
#include <Kernel/Net/UDPSocket.h>
#include <Kernel/Process.h>
#include <Kernel/ProcessExposed.h>
#include <Kernel/Sections.h>
#include <Kernel/TTY/TTY.h>
@ -905,10 +906,13 @@ KResult ProcFSRootDirectory::traverse_as_directory(unsigned fsid, Function<bool(
InodeIdentifier identifier = { fsid, component.component_index() };
callback({ component.name(), identifier, 0 });
}
for (auto& component : m_process_directories) {
InodeIdentifier identifier = { fsid, component.component_index() };
callback({ component.name(), identifier, 0 });
}
processes().for_each_shared([&](Process& process) {
VERIFY(!(process.pid() < 0));
u64 process_id = (u64)process.pid().value();
InodeIdentifier identifier = { fsid, static_cast<InodeIndex>(process_id << 36) };
callback({ String::formatted("{:d}", process.pid().value()), identifier, 0 });
return IterationDecision::Continue;
});
return KSuccess;
}
@ -917,12 +921,12 @@ RefPtr<ProcFSExposedComponent> ProcFSRootDirectory::lookup(StringView name)
if (auto candidate = ProcFSExposedDirectory::lookup(name); !candidate.is_null())
return candidate;
for (auto& component : m_process_directories) {
if (component.name() == name) {
return component;
}
}
return {};
String process_directory_name = name;
auto pid = process_directory_name.to_uint<unsigned>();
if (!pid.has_value())
return {};
auto actual_pid = pid.value();
return Process::from_pid(actual_pid);
}
UNMAP_AFTER_INIT ProcFSRootDirectory::ProcFSRootDirectory()
@ -934,14 +938,4 @@ UNMAP_AFTER_INIT ProcFSRootDirectory::~ProcFSRootDirectory()
{
}
RefPtr<ProcFSProcessDirectory> ProcFSRootDirectory::process_directory_for(Process& process)
{
RefPtr<Process> checked_process = process;
for (auto& directory : m_process_directories) {
if (directory.associated_process().ptr() == checked_process.ptr())
return directory;
}
return {};
}
}