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Kernel+LibCore: Make %sid path parsing not take ages

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Before this patch, Core::SessionManagement::parse_path_with_sid() would
figure out the root session ID by sifting through /sys/kernel/processes.

That file can take quite a while to generate (sometimes up to 40ms on my
machine, which is a problem on its own!) and with no caching, many of
our programs were effectively doing this multiple times on startup when
unveiling something in /tmp/session/%sid/

While we should find ways to make generating /sys/kernel/processes fast
again, this patch addresses the specific problem by introducing a new
syscall: sys$get_root_session_id(). This extracts the root session ID
by looking directly at the process table and takes <1ms instead of 40ms.

This cuts WebContent process startup time by ~100ms on my machine. :^)
This commit is contained in:
Andreas Kling 2023-01-10 17:25:01 +01:00
parent 491edaffc7
commit 5dcc58d54a
4 changed files with 36 additions and 24 deletions
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Kernel/Process.h
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@ -448,6 +448,7 @@ public:
ErrorOr<FlatPtr> sys$map_time_page();
ErrorOr<FlatPtr> sys$jail_create(Userspace<Syscall::SC_jail_create_params*> user_params);
ErrorOr<FlatPtr> sys$jail_attach(Userspace<Syscall::SC_jail_attach_params const*> user_params);
ErrorOr<FlatPtr> sys$get_root_session_id(pid_t force_sid);
template<bool sockname, typename Params>
ErrorOr<void> get_sock_or_peer_name(Params const&);