* sysdeps/powerpc/powerpc64/Makefile
(sysdep_routines, elide-routines.os): Add hp-timing. * sysdeps/powerpc/powerpc64/hp-timing.c: New file. * sysdeps/powerpc/powerpc64/hp-timing.h: New file. * sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c: New file.
This commit is contained in:
Ulrich Drepper
parent
cb07f6f67d
commit
7006f757e6
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@ -1,3 +1,11 @@
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2005-10-31 Steven Munroe <sjmunroe@us.ibm.com>
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* sysdeps/powerpc/powerpc64/Makefile
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(sysdep_routines, elide-routines.os): Add hp-timing.
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* sysdeps/powerpc/powerpc64/hp-timing.c: New file.
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* sysdeps/powerpc/powerpc64/hp-timing.h: New file.
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* sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c: New file.
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2005-10-31 Ulrich Drepper <drepper@redhat.com>
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* resolv/res_init.c (__res_iclose): New function. Broken out of
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@ -11,6 +11,8 @@ pic-ccflag = -fpic
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endif
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ifeq ($(subdir),csu)
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sysdep_routines += hp-timing
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elide-routines.os += hp-timing
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ifneq ($(elf),no)
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# The initfini generation code doesn't work in the presence of -fPIC, so
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# we use -fpic instead which is much better.
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@ -0,0 +1,25 @@
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/* Support for high precision, low overhead timing functions.
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powerpc64 version.
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <hp-timing.h>
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/* We have to define the variable for the overhead. */
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hp_timing_t _dl_hp_timing_overhead;
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@ -0,0 +1,136 @@
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/* High precision, low overhead timing functions. powerpc64 version.
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _HP_TIMING_H
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#define _HP_TIMING_H 1
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#include <string.h>
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#include <sys/param.h>
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#include <stdio-common/_itoa.h>
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#include <atomic.h>
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/* The macros defined here use the powerpc 64-bit time base register.
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The time base is nominally clocked at 1/8th the CPU clock, but this
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can vary.
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The list of macros we need includes the following:
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- HP_TIMING_AVAIL: test for availability.
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- HP_TIMING_INLINE: this macro is non-zero if the functionality is not
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implemented using function calls but instead uses some inlined code
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which might simply consist of a few assembler instructions. We have to
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know this since we might want to use the macros here in places where we
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cannot make function calls.
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- hp_timing_t: This is the type for variables used to store the time
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values.
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- HP_TIMING_ZERO: clear `hp_timing_t' object.
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- HP_TIMING_NOW: place timestamp for current time in variable given as
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parameter.
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- HP_TIMING_DIFF_INIT: do whatever is necessary to be able to use the
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HP_TIMING_DIFF macro.
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- HP_TIMING_DIFF: compute difference between two times and store it
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in a third. Source and destination might overlap.
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- HP_TIMING_ACCUM: add time difference to another variable. This might
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be a bit more complicated to implement for some platforms as the
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operation should be thread-safe and 64bit arithmetic on 32bit platforms
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is not.
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- HP_TIMING_ACCUM_NT: this is the variant for situations where we know
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there are no threads involved.
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- HP_TIMING_PRINT: write decimal representation of the timing value into
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the given string. This operation need not be inline even though
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HP_TIMING_INLINE is specified.
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*/
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/* We always assume having the timestamp register. */
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#define HP_TIMING_AVAIL (1)
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/* We indeed have inlined functions. */
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#define HP_TIMING_INLINE (1)
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/* We use 64bit values for the times. */
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typedef unsigned long long int hp_timing_t;
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/* Set timestamp value to zero. */
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#define HP_TIMING_ZERO(Var) (Var) = (0)
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/* That's quite simple. Use the `mftb' instruction. Note that the value
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might not be 100% accurate since there might be some more instructions
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running in this moment. This could be changed by using a barrier like
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'lwsync' right before the `mftb' instruciton. But we are not interested
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in accurate clock cycles here so we don't do this. */
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#define HP_TIMING_NOW(Var) __asm__ __volatile__ ("mftb %0" : "=r" (Var))
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/* Use two 'mftb' instructions in a row to find out how long it takes.
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On current POWER4, POWER5, and 970 processors mftb take ~10 cycles. */
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#define HP_TIMING_DIFF_INIT() \
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do { \
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if (GLRO(dl_hp_timing_overhead) == 0) \
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{ \
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int __cnt = 5; \
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GLRO(dl_hp_timing_overhead) = ~0ull; \
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do \
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{ \
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hp_timing_t __t1, __t2; \
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HP_TIMING_NOW (__t1); \
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HP_TIMING_NOW (__t2); \
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if (__t2 - __t1 < GLRO(dl_hp_timing_overhead)) \
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GLRO(dl_hp_timing_overhead) = __t2 - __t1; \
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} \
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while (--__cnt > 0); \
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} \
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} while (0)
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/* It's simple arithmetic in 64-bit. */
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#define HP_TIMING_DIFF(Diff, Start, End) (Diff) = ((End) - (Start))
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/* We need to insure that this add is atomic in threaded environments. We use
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__arch_atomic_exchange_and_add_64 from atomic.h to get thread safety. */
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#define HP_TIMING_ACCUM(Sum, Diff) \
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do { \
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hp_timing_t __diff = (Diff) - GLRO(dl_hp_timing_overhead); \
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__arch_atomic_exchange_and_add_64 (&(Sum), __diff); \
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} while (0)
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/* No threads, no extra work. */
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#define HP_TIMING_ACCUM_NT(Sum, Diff) (Sum) += (Diff)
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/* Print the time value. */
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#define HP_TIMING_PRINT(Buf, Len, Val) \
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do { \
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char __buf[20]; \
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char *__cp = _itoa (Val, __buf + sizeof (__buf), 10, 0); \
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size_t __len = (Len); \
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char *__dest = (Buf); \
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while (__len-- > 0 && __cp < __buf + sizeof (__buf)) \
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*__dest++ = *__cp++; \
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memcpy (__dest, " ticks", MIN (__len, sizeof (" ticks"))); \
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} while (0)
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#endif /* hp-timing.h */
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@ -0,0 +1,105 @@
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/* Get frequency of the system processor. powerpc/Linux version.
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Copyright (C) 2000, 2001, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <ctype.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <libc-internal.h>
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hp_timing_t
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__get_clockfreq (void)
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{
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/* We read the information from the /proc filesystem. /proc/cpuinfo
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contains at least one line like:
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timebase : 33333333
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We search for this line and convert the number into an integer. */
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static hp_timing_t timebase_freq;
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hp_timing_t result = 0L;
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/* If this function was called before, we know the result. */
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if (timebase_freq != 0)
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return timebase_freq;
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int fd = open ("/proc/cpuinfo", O_RDONLY);
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if (__builtin_expect (fd != -1, 1))
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{
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/* The timebase will be in the 1st 1024 bytes for systems with up
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to 8 processors. If the first read returns less then 1024
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bytes read, we have the whole cpuinfo and can start the scan.
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Otherwise we will have to read more to insure we have the
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timebase value in the scan. */
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char buf[1024];
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ssize_t n;
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n = read (fd, buf, sizeof (buf));
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if (n == sizeof (buf))
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{
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/* We are here because the 1st read returned exactly sizeof
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(buf) bytes. This implies that we are not at EOF and may
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not have read the timebase value yet. So we need to read
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more bytes until we know we have EOF. We copy the lower
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half of buf to the upper half and read sizeof (buf)/2
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bytes into the lower half of buf and repeat until we
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reach EOF. We can assume that the timebase will be in
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the last 512 bytes of cpuinfo, so two 512 byte half_bufs
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will be sufficient to contain the timebase and will
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handle the case where the timebase spans the half_buf
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boundry. */
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const ssize_t half_buf = sizeof (buf) / 2;
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while (n >= half_buf)
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{
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memcpy (buf, buf + half_buf, half_buf);
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n = read (fd, buf + half_buf, half_buf);
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}
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if (n >= 0)
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n += half_buf;
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}
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if (__builtin_expect (n, 1) > 0)
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{
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char *mhz = memmem (buf, n, "timebase", 7);
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if (__builtin_expect (mhz != NULL, 1))
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{
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char *endp = buf + n;
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/* Search for the beginning of the string. */
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while (mhz < endp && (*mhz < '0' || *mhz > '9') && *mhz != '\n')
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++mhz;
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while (mhz < endp && *mhz != '\n')
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{
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if (*mhz >= '0' && *mhz <= '9')
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{
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result *= 10;
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result += *mhz - '0';
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}
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++mhz;
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}
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}
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timebase_freq = result;
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}
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close (fd);
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}
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return timebase_freq;
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}
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