Compute and pring the time that it takes to execute system calls. This data...

sandbox/linux/seccomp/trusted_thread.cc

Index: sandbox/linux/seccomp/trusted_thread.cc
===================================================================
--- sandbox/linux/seccomp/trusted_thread.cc	(revision 41782)
+++ sandbox/linux/seccomp/trusted_thread.cc	(working copy)
@@ -86,6 +86,9 @@
       //   0x3C: RDTSCP result (%eax)
       //   0x40: RDTSCP result (%edx)
       //   0x44: RDTSCP result (%ecx)
+      //   0x48: last system call (not used on x86-64)
+      //   0x4C: number of consecutive calls to a time fnc (not used on x86-64)
+      //   0x50: nesting level of system calls (for debugging purposes only)
 
       // We use the %fs register for accessing the secure read-only page, and
       // the untrusted scratch space immediately following it. The segment
@@ -699,6 +702,7 @@
       //   0x28: RDTSCP result (%ecx)
       //   0x2C: last system call (updated in syscall.cc)
       //   0x30: number of consecutive calls to a time fnc. (e.g. gettimeofday)
+      //   0x34: nesting level of system calls (for debugging purposes only)
 
     "0:xor  %%esp, %%esp\n"
       "mov  $2, %%eax\n"           // %mm2 = initial sequence number