add timing for syscall

src/libos/Cargo.toml

@@ -15,6 +15,7 @@ rcore-fs-sefs = { path = "../../deps/sefs/rcore-fs-sefs" }
 
 [features]
 default = []
+syscall_timing = []
 
 [target.'cfg(not(target_env = "sgx"))'.dependencies]
 xmas-elf = { path = "../../deps/xmas-elf" }

src/libos/src/syscall/mod.rs

@@ -29,6 +29,8 @@ use std::any::Any;
 
 mod consts;
 
+static mut SYSCALL_TIMING: [usize; 361] = [0; 361];
+
 #[no_mangle]
 #[deny(unreachable_patterns)]
 pub extern "C" fn dispatch_syscall(
@@ -44,6 +46,14 @@ pub extern "C" fn dispatch_syscall(
         "syscall {}: {:#x}, {:#x}, {:#x}, {:#x}, {:#x}, {:#x}",
         num, arg0, arg1, arg2, arg3, arg4, arg5
     );
+    #[cfg(feature = "syscall_timing")]
+    let time_start = {
+        if crate::process::current_pid() == 1 && num == SYS_EXIT {
+            print_syscall_timing();
+        }
+        crate::time::do_gettimeofday().as_usec()
+    };
+
     let ret = match num {
         // file
         SYS_OPEN => do_open(arg0 as *const i8, arg1 as u32, arg2 as u32),
@@ -256,6 +266,16 @@ pub extern "C" fn dispatch_syscall(
 
         _ => do_unknown(num, arg0, arg1, arg2, arg3, arg4, arg5),
     };
+
+    #[cfg(feature = "syscall_timing")]
+    {
+        let time_end = crate::time::do_gettimeofday().as_usec();
+        let time = time_end - time_start;
+        unsafe {
+            SYSCALL_TIMING[num as usize] += time as usize;
+        }
+    }
+
     info!("=> {:?}", ret);
 
     match ret {
@@ -264,6 +284,17 @@ pub extern "C" fn dispatch_syscall(
     }
 }
 
+#[cfg(feature = "syscall_timing")]
+fn print_syscall_timing() {
+    println!("syscall timing:");
+    for (i, &time) in unsafe { SYSCALL_TIMING }.iter().enumerate() {
+        if time == 0 {
+            continue;
+        }
+        println!("{:>3}: {:>6} us", i, time);
+    }
+}
+
 #[allow(non_camel_case_types)]
 pub struct iovec_t {
     base: *const c_void,

src/libos/src/time/mod.rs

@@ -16,6 +16,12 @@ pub struct timeval_t {
     usec: suseconds_t,
 }
 
+impl timeval_t {
+    pub fn as_usec(&self) -> usize {
+        (self.sec * 1000000 + self.usec) as usize
+    }
+}
+
 pub fn do_gettimeofday() -> timeval_t {
     let mut tv: timeval_t = Default::default();
     unsafe {