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Kernel: Expose process cpu time in proc filesystem

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Bananymous
2026-06-26 01:42:35 +03:00
parent 7bf7de44d2
commit 579cd07109
3 changed files with 24 additions and 2 deletions
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1
kernel/include/kernel/Process.h
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@@ -234,6 +234,7 @@ namespace Kernel
size_t proc_meminfo(off_t offset, BAN::ByteSpan) const;
size_t proc_cmdline(off_t offset, BAN::ByteSpan) const;
size_t proc_environ(off_t offset, BAN::ByteSpan) const;
size_t proc_cputime(off_t offset, BAN::ByteSpan) const;
BAN::ErrorOr<BAN::String> proc_cwd() const;
BAN::ErrorOr<BAN::String> proc_exe() const;

6
kernel/kernel/FS/ProcFS/Inode.cpp
View File

@@ -16,12 +16,13 @@ namespace Kernel
TRY(inode->link_inode(*inode, "."_sv));
TRY(inode->link_inode(static_cast<TmpInode&>(*fs.root_inode()), ".."_sv));
TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_meminfo, fs, 0400)), "meminfo"_sv));
TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_meminfo, fs, 0444)), "meminfo"_sv));
TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_cmdline, fs, 0444)), "cmdline"_sv));
TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_environ, fs, 0400)), "environ"_sv));
TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_cputime, fs, 0444)), "cputime"_sv));
TRY(inode->link_inode(*MUST(ProcSymlinkProcessInode::create_new(process, &Process::proc_cwd, fs, 0777)), "cwd"_sv));
TRY(inode->link_inode(*MUST(ProcSymlinkProcessInode::create_new(process, &Process::proc_exe, fs, 0777)), "exe"_sv));
TRY(inode->link_inode(*MUST(ProcFDDirectoryInode::create_new(process, fs, 0777)), "fd"_sv));
TRY(inode->link_inode(*MUST(ProcFDDirectoryInode::create_new(process, fs, 0500)), "fd"_sv));
return inode;
}
@@ -38,6 +39,7 @@ namespace Kernel
(void)TmpDirectoryInode::unlink_impl("meminfo"_sv);
(void)TmpDirectoryInode::unlink_impl("cmdline"_sv);
(void)TmpDirectoryInode::unlink_impl("environ"_sv);
(void)TmpDirectoryInode::unlink_impl("cputime"_sv);
(void)TmpDirectoryInode::unlink_impl("cwd"_sv);
(void)TmpDirectoryInode::unlink_impl("exe"_sv);
(void)TmpDirectoryInode::unlink_impl("fd"_sv);

19
kernel/kernel/Process.cpp
View File

@@ -574,6 +574,25 @@ namespace Kernel
return read_from_vec_of_str(m_environ, offset, buffer);
}
size_t Process::proc_cputime(off_t offset, BAN::ByteSpan buffer) const
{
const uint64_t cpu_time_ns = [this] {
uint64_t cpu_time_ns { 0 };
LockGuard _(m_process_lock);
for (auto* thread : m_threads)
cpu_time_ns += thread->cpu_time_ns();
return cpu_time_ns;
}();
auto data = MUST(BAN::String::formatted("{}", cpu_time_ns));
if (static_cast<size_t>(offset) >= data.size() + 1)
return 0;
const size_t to_copy = BAN::Math::min<size_t>(data.size() - offset + 1, buffer.size());
memcpy(buffer.data(), data.data(), to_copy);
return to_copy;
}
BAN::ErrorOr<BAN::String> Process::proc_cwd() const
{
LockGuard _(m_process_lock);