remove ceval timestamp support

Doc/library/sys.rst

@@ -1104,18 +1104,6 @@ always available.
       thus may not be available in all Python implementations.
 
 
-.. function:: settscdump(on_flag)
-
-   Activate dumping of VM measurements using the Pentium timestamp counter, if
-   *on_flag* is true. Deactivate these dumps if *on_flag* is off. The function is
-   available only if Python was compiled with ``--with-tsc``. To understand
-   the output of this dump, read :file:`Python/ceval.c` in the Python sources.
-
-   .. impl-detail::
-      This function is intimately bound to CPython implementation details and
-      thus not likely to be implemented elsewhere.
-
-
 .. function:: set_coroutine_wrapper(wrapper)
 
    Allows intercepting creation of :term:`coroutine` objects (only ones that

Include/pystate.h

@@ -43,9 +43,6 @@ typedef struct _is {
 #ifdef HAVE_DLOPEN
     int dlopenflags;
 #endif
-#ifdef WITH_TSC
-    int tscdump;
-#endif
 
     PyObject *builtins_copy;
     PyObject *import_func;

Misc/SpecialBuilds.txt

@@ -234,29 +234,3 @@ When this symbol is defined, the ceval mainloop and helper functions count the
 number of function calls made.  It keeps detailed statistics about what kind of
 object was called and whether the call hit any of the special fast paths in the
 code.
-
-
-WITH_TSC
---------
-
-Super-lowlevel profiling of the interpreter.  When enabled, the sys module grows
-a new function:
-
-settscdump(bool)
-    If true, tell the Python interpreter to dump VM measurements to stderr.  If
-    false, turn off dump.  The measurements are based on the processor's
-    time-stamp counter.
-
-This build option requires a small amount of platform specific code.  Currently
-this code is present for linux/x86 and any PowerPC platform that uses GCC
-(i.e. OS X and linux/ppc).
-
-On the PowerPC the rate at which the time base register is incremented is not
-defined by the architecture specification, so you'll need to find the manual for
-your specific processor.  For the 750CX, 750CXe and 750FX (all sold as the G3)
-we find:
-
-    The time base counter is clocked at a frequency that is one-fourth that of
-    the bus clock.
-
-This build is enabled by the --with-tsc flag to configure.

Python/ceval.c

@@ -20,82 +20,6 @@
 
 #include <ctype.h>
 
-#ifndef WITH_TSC
-
-#define READ_TIMESTAMP(var)
-
-#else
-
-typedef unsigned long long uint64;
-
-/* PowerPC support.
-   "__ppc__" appears to be the preprocessor definition to detect on OS X, whereas
-   "__powerpc__" appears to be the correct one for Linux with GCC
-*/
-#if defined(__ppc__) || defined (__powerpc__)
-
-#define READ_TIMESTAMP(var) ppc_getcounter(&var)
-
-static void
-ppc_getcounter(uint64 *v)
-{
-    unsigned long tbu, tb, tbu2;
-
-  loop:
-    asm volatile ("mftbu %0" : "=r" (tbu) );
-    asm volatile ("mftb  %0" : "=r" (tb)  );
-    asm volatile ("mftbu %0" : "=r" (tbu2));
-    if (__builtin_expect(tbu != tbu2, 0)) goto loop;
-
-    /* The slightly peculiar way of writing the next lines is
-       compiled better by GCC than any other way I tried. */
-    ((long*)(v))[0] = tbu;
-    ((long*)(v))[1] = tb;
-}
-
-#elif defined(__i386__)
-
-/* this is for linux/x86 (and probably any other GCC/x86 combo) */
-
-#define READ_TIMESTAMP(val) \
-     __asm__ __volatile__("rdtsc" : "=A" (val))
-
-#elif defined(__x86_64__)
-
-/* for gcc/x86_64, the "A" constraint in DI mode means *either* rax *or* rdx;
-   not edx:eax as it does for i386.  Since rdtsc puts its result in edx:eax
-   even in 64-bit mode, we need to use "a" and "d" for the lower and upper
-   32-bit pieces of the result. */
-
-#define READ_TIMESTAMP(val) do {                        \
-    unsigned int h, l;                                  \
-    __asm__ __volatile__("rdtsc" : "=a" (l), "=d" (h)); \
-    (val) = ((uint64)l) | (((uint64)h) << 32);          \
-    } while(0)
-
-
-#else
-
-#error "Don't know how to implement timestamp counter for this architecture"
-
-#endif
-
-void dump_tsc(int opcode, int ticked, uint64 inst0, uint64 inst1,
-              uint64 loop0, uint64 loop1, uint64 intr0, uint64 intr1)
-{
-    uint64 intr, inst, loop;
-    PyThreadState *tstate = PyThreadState_Get();
-    if (!tstate->interp->tscdump)
-        return;
-    intr = intr1 - intr0;
-    inst = inst1 - inst0 - intr;
-    loop = loop1 - loop0 - intr;
-    fprintf(stderr, "opcode=%03d t=%d inst=%06lld loop=%06lld\n",
-            opcode, ticked, inst, loop);
-}
-
-#endif
-
 /* Turn this on if your compiler chokes on the big switch: */
 /* #define CASE_TOO_BIG 1 */
 
@@ -108,11 +32,7 @@ void dump_tsc(int opcode, int ticked, uint64 inst0, uint64 inst1,
 typedef PyObject *(*callproc)(PyObject *, PyObject *, PyObject *);
 
 /* Forward declarations */
-#ifdef WITH_TSC
-static PyObject * call_function(PyObject ***, Py_ssize_t, PyObject *, uint64*, uint64*);
-#else
 static PyObject * call_function(PyObject ***, Py_ssize_t, PyObject *);
-#endif
 static PyObject * fast_function(PyObject *, PyObject **, Py_ssize_t, PyObject *);
 static PyObject * do_call_core(PyObject *, PyObject *, PyObject *);
 
@@ -938,46 +858,6 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
 #define GETITEM(v, i) PyTuple_GetItem((v), (i))
 #endif
 
-#ifdef WITH_TSC
-/* Use Pentium timestamp counter to mark certain events:
-   inst0 -- beginning of switch statement for opcode dispatch
-   inst1 -- end of switch statement (may be skipped)
-   loop0 -- the top of the mainloop
-   loop1 -- place where control returns again to top of mainloop
-            (may be skipped)
-   intr1 -- beginning of long interruption
-   intr2 -- end of long interruption
-
-   Many opcodes call out to helper C functions.  In some cases, the
-   time in those functions should be counted towards the time for the
-   opcode, but not in all cases.  For example, a CALL_FUNCTION opcode
-   calls another Python function; there's no point in charge all the
-   bytecode executed by the called function to the caller.
-
-   It's hard to make a useful judgement statically.  In the presence
-   of operator overloading, it's impossible to tell if a call will
-   execute new Python code or not.
-
-   It's a case-by-case judgement.  I'll use intr1 for the following
-   cases:
-
-   IMPORT_STAR
-   IMPORT_FROM
-   CALL_FUNCTION (and friends)
-
- */
-    uint64 inst0, inst1, loop0, loop1, intr0 = 0, intr1 = 0;
-    int ticked = 0;
-
-    READ_TIMESTAMP(inst0);
-    READ_TIMESTAMP(inst1);
-    READ_TIMESTAMP(loop0);
-    READ_TIMESTAMP(loop1);
-
-    /* shut up the compiler */
-    opcode = 0;
-#endif
-
 /* Code access macros */
 
 #ifdef WORDS_BIGENDIAN
@@ -1225,23 +1105,6 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
 #endif
 
     for (;;) {
-#ifdef WITH_TSC
-        if (inst1 == 0) {
-            /* Almost surely, the opcode executed a break
-               or a continue, preventing inst1 from being set
-               on the way out of the loop.
-            */
-            READ_TIMESTAMP(inst1);
-            loop1 = inst1;
-        }
-        dump_tsc(opcode, ticked, inst0, inst1, loop0, loop1,
-                 intr0, intr1);
-        ticked = 0;
-        inst1 = 0;
-        intr0 = 0;
-        intr1 = 0;
-        READ_TIMESTAMP(loop0);
-#endif
         assert(stack_pointer >= f->f_valuestack); /* else underflow */
         assert(STACK_LEVEL() <= co->co_stacksize);  /* else overflow */
         assert(!PyErr_Occurred());
@@ -1260,9 +1123,6 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
                    a try: finally: block uninterruptible. */
                 goto fast_next_opcode;
             }
-#ifdef WITH_TSC
-            ticked = 1;
-#endif
             if (_Py_atomic_load_relaxed(&pendingcalls_to_do)) {
                 if (Py_MakePendingCalls() < 0)
                     goto error;
@@ -3403,11 +3263,7 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
             PyObject **sp, *res;
             PCALL(PCALL_ALL);
             sp = stack_pointer;
-#ifdef WITH_TSC
-            res = call_function(&sp, oparg, NULL, &intr0, &intr1);
-#else
             res = call_function(&sp, oparg, NULL);
-#endif
             stack_pointer = sp;
             PUSH(res);
             if (res == NULL) {
@@ -3423,11 +3279,7 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
             assert(PyTuple_CheckExact(names) && PyTuple_GET_SIZE(names) <= oparg);
             PCALL(PCALL_ALL);
             sp = stack_pointer;
-#ifdef WITH_TSC
-            res = call_function(&sp, oparg, names, &intr0, &intr1);
-#else
             res = call_function(&sp, oparg, names);
-#endif
             stack_pointer = sp;
             PUSH(res);
             Py_DECREF(names);
@@ -4922,11 +4774,7 @@ if (tstate->use_tracing && tstate->c_profilefunc) { \
     }
 
 static PyObject *
-call_function(PyObject ***pp_stack, Py_ssize_t oparg, PyObject *kwnames
+call_function(PyObject ***pp_stack, Py_ssize_t oparg, PyObject *kwnames)
-#ifdef WITH_TSC
-                , uint64* pintr0, uint64* pintr1
-#endif
-                )
 {
     PyObject **pfunc = (*pp_stack) - oparg - 1;
     PyObject *func = *pfunc;

Python/pystate.c

@@ -98,9 +98,6 @@ PyInterpreterState_New(void)
 #else
         interp->dlopenflags = RTLD_LAZY;
 #endif
-#endif
-#ifdef WITH_TSC
-        interp->tscdump = 0;
 #endif
 
         HEAD_LOCK();

Python/sysmodule.c

@@ -609,33 +609,6 @@ PyDoc_STRVAR(getswitchinterval_doc,
 
 #endif /* WITH_THREAD */
 
-#ifdef WITH_TSC
-static PyObject *
-sys_settscdump(PyObject *self, PyObject *args)
-{
-    int bool;
-    PyThreadState *tstate = PyThreadState_Get();
-
-    if (!PyArg_ParseTuple(args, "i:settscdump", &bool))
-        return NULL;
-    if (bool)
-        tstate->interp->tscdump = 1;
-    else
-        tstate->interp->tscdump = 0;
-    Py_INCREF(Py_None);
-    return Py_None;
-
-}
-
-PyDoc_STRVAR(settscdump_doc,
-"settscdump(bool)\n\
-\n\
-If true, tell the Python interpreter to dump VM measurements to\n\
-stderr.  If false, turn off dump.  The measurements are based on the\n\
-processor's time-stamp counter."
-);
-#endif /* TSC */
-
 static PyObject *
 sys_setrecursionlimit(PyObject *self, PyObject *args)
 {
@@ -1410,9 +1383,6 @@ static PyMethodDef sys_methods[] = {
     {"getprofile",      sys_getprofile, METH_NOARGS, getprofile_doc},
     {"setrecursionlimit", sys_setrecursionlimit, METH_VARARGS,
      setrecursionlimit_doc},
-#ifdef WITH_TSC
-    {"settscdump", sys_settscdump, METH_VARARGS, settscdump_doc},
-#endif
     {"settrace",        sys_settrace, METH_O, settrace_doc},
     {"gettrace",        sys_gettrace, METH_NOARGS, gettrace_doc},
     {"call_tracing", sys_call_tracing, METH_VARARGS, call_tracing_doc},

configure

@@ -830,7 +830,6 @@ with_threads
 with_thread
 enable_ipv6
 with_doc_strings
-with_tsc
 with_pymalloc
 with_valgrind
 with_fpectl
@@ -1534,7 +1533,6 @@ Optional Packages:
   --with(out)-thread[=DIRECTORY]
                           deprecated; use --with(out)-threads
   --with(out)-doc-strings disable/enable documentation strings
-  --with(out)-tsc         enable/disable timestamp counter profile
   --with(out)-pymalloc    disable/enable specialized mallocs
   --with-valgrind         Enable Valgrind support
   --with-fpectl           enable SIGFPE catching
@@ -10798,29 +10796,6 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_doc_strings" >&5
 $as_echo "$with_doc_strings" >&6; }
 
-# Check if eval loop should use timestamp counter profiling
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-tsc" >&5
-$as_echo_n "checking for --with-tsc... " >&6; }
-
-# Check whether --with-tsc was given.
-if test "${with_tsc+set}" = set; then :
-  withval=$with_tsc;
-if test "$withval" != no
-then
-
-$as_echo "#define WITH_TSC 1" >>confdefs.h
-
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-else { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-fi
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-fi
-
-
 # Check for Python-specific malloc support
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-pymalloc" >&5
 $as_echo_n "checking for --with-pymalloc... " >&6; }

configure.ac

@@ -3198,19 +3198,6 @@ then
 fi
 AC_MSG_RESULT($with_doc_strings)
 
-# Check if eval loop should use timestamp counter profiling
-AC_MSG_CHECKING(for --with-tsc)
-AC_ARG_WITH(tsc,
-	    AS_HELP_STRING([--with(out)-tsc],[enable/disable timestamp counter profile]),[
-if test "$withval" != no
-then
-  AC_DEFINE(WITH_TSC, 1,
-    [Define to profile with the Pentium timestamp counter])
-    AC_MSG_RESULT(yes)
-else AC_MSG_RESULT(no)
-fi],
-[AC_MSG_RESULT(no)])
-
 # Check for Python-specific malloc support
 AC_MSG_CHECKING(for --with-pymalloc)
 AC_ARG_WITH(pymalloc,

pyconfig.h.in

@@ -1388,9 +1388,6 @@
 /* Define if you want to compile in rudimentary thread support */
 #undef WITH_THREAD
 
-/* Define to profile with the Pentium timestamp counter */
-#undef WITH_TSC
-
 /* Define if you want pymalloc to be disabled when running under valgrind */
 #undef WITH_VALGRIND