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| author | Andreas Kling <kling@serenityos.org> | 2023-01-10 17:25:01 +0100 |
|---|---|---|
| committer | Andreas Kling <kling@serenityos.org> | 2023-01-10 19:32:31 +0100 |
| commit | 5dcc58d54ac7057f092ac9287a853e78015007c8 (patch) | |
| tree | 4e29874073255df53aca9da8a866eed5a5c0ca52 /Kernel/API | |
| parent | 491edaffc708d5174a0126244d3cd99fc05290e3 (diff) | |
| download | serenity-5dcc58d54ac7057f092ac9287a853e78015007c8.zip | |
Kernel+LibCore: Make %sid path parsing not take ages
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. :^)
Diffstat (limited to 'Kernel/API')
| -rw-r--r-- | Kernel/API/Syscall.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Kernel/API/Syscall.h b/Kernel/API/Syscall.h index 0d0a0555ee..b58efd4737 100644 --- a/Kernel/API/Syscall.h +++ b/Kernel/API/Syscall.h @@ -81,6 +81,7 @@ enum class NeedsBigProcessLock { S(futex, NeedsBigProcessLock::Yes) \ S(get_dir_entries, NeedsBigProcessLock::Yes) \ S(get_process_name, NeedsBigProcessLock::Yes) \ + S(get_root_session_id, NeedsBigProcessLock::No) \ S(get_stack_bounds, NeedsBigProcessLock::No) \ S(get_thread_name, NeedsBigProcessLock::Yes) \ S(getcwd, NeedsBigProcessLock::No) \ |