Kernel: Add syscall performance event type

This allows tracing the syscalls made by a thread through the kernel's
performance event framework, which is similar in principle to strace.

Currently, this merely logs a stack backtrace to the current thread's
performance event buffer whenever a syscall is made, if profiling is
enabled. Future improvements could include tracing the arguments and
the return value, for example.

1 files changed, 1 insertions, 0 deletions

diff --git a/Kernel/UnixTypes.h b/Kernel/UnixTypes.h
index 44a3351a8a..9ebc56bca8 100644
--- a/Kernel/UnixTypes.h
+++ b/Kernel/UnixTypes.h
@@ -62,6 +62,7 @@ enum {
     PERF_EVENT_KMALLOC = 2048,
     PERF_EVENT_KFREE = 4096,
     PERF_EVENT_PAGE_FAULT = 8192,
+    PERF_EVENT_SYSCALL = 16384,
 };
 
 #define WNOHANG 1