from CMU(CODA or MACH, by Robert Baron):

Under the GPROF conditional emit a call to mcount for bcopy, bzero,
copyin, and copyout, so they can be profiled.  During a kernel build
these 4 routines account for 14% of the time in the kernel.

diff --git a/sys/arch/i386/i386/locore.s b/sys/arch/i386/i386/locore.s
index 65f33ef..9d6eb17 100644 (file)
--- a/sys/arch/i386/i386/locore.s
+++ b/sys/arch/i386/i386/locore.s
@@ -133,6 +133,20 @@
        .set    _APTD,(_APTmap + APTDPTDI * NBPG)
        .set    _APTDpde,(_PTD + APTDPTDI * 4)          # XXX 4 == sizeof pde
 
+#ifdef        GPROF
+#define       PENTRY(name)    \
+       ENTRY(name) \
+       pushl   %ebp \
+       movl    %esp,%ebp \
+       pushl   %ebx \
+       pushl   _cpl \
+       movl    $0,_cpl \
+       call    _Xspllower \
+       call    mcount \
+       popl    _cpl \
+       leal    4(%esp),%esp \
+       popl    %ebp
+#endif
 #define        ENTRY(name)     .globl _/**/name; ALIGN_TEXT; _/**/name:
 #define        ALTENTRY(name)  .globl _/**/name; _/**/name:
 
@@ -801,8 +815,14 @@ ENTRY(bcopyw)
  * bcopy(caddr_t from, caddr_t to, size_t len);
  * Copy len bytes.
  */
+#ifdef        GPROF
+ENTRY(ovbcopy)
+       jmp _bcopy
+PENTRY(bcopy)
+#else
 ENTRY(bcopy)
 ALTENTRY(ovbcopy)
+#endif
        pushl   %esi
        pushl   %edi
        movl    12(%esp),%esi
@@ -853,7 +873,11 @@ ALTENTRY(ovbcopy)
  * copyout(caddr_t from, caddr_t to, size_t len);
  * Copy len bytes into the user's address space.
  */
+#ifdef        GPROF
+PENTRY(copyout)
+#else
 ENTRY(copyout)
+#endif
        pushl   %esi
        pushl   %edi
        movl    _curpcb,%eax
@@ -948,7 +972,11 @@ ENTRY(copyout)
  * copyin(caddr_t from, caddr_t to, size_t len);
  * Copy len bytes from the user's address space.
  */
+#ifdef        GPROF
+PENTRY(copyin)
+#else
 ENTRY(copyin)
+#endif
        pushl   %esi
        pushl   %edi
        movl    _curpcb,%eax
@@ -2128,7 +2156,11 @@ syscall1:
  *     write len zero bytes to the string b.
  */
 
+#ifdef        GPROF
+PENTRY(bzero)
+#else
 ENTRY(bzero)
+#endif
        pushl   %edi
        movl    8(%esp),%edi
        movl    12(%esp),%edx