remove perfctr support

Perfctr is a Linux kernel extension that allows programmatic access
to the performance monitoring counters found in most current CPUs.
However, development of perfctr ceased after 2010, and it cannot be
used with Linux kernels newer than 2.6.32.

Therefore the perfctr support code in the Erlang VM is effectively
dead code, so this patch removes it.

1 files changed, 0 insertions, 229 deletions

diff --git a/erts/emulator/hipe/hipe_perfctr.c b/erts/emulator/hipe/hipe_perfctr.c
deleted file mode 100644
index 371b3fb097..0000000000
--- a/erts/emulator/hipe/hipe_perfctr.c
+++ /dev/null
@@ -1,229 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 2004-2011. All Rights Reserved.
- *
- * The contents of this file are subject to the Erlang Public License,
- * Version 1.1, (the "License"); you may not use this file except in
- * compliance with the License. You should have received a copy of the
- * Erlang Public License along with this software. If not, it can be
- * retrieved online at http://www.erlang.org/.
- *
- * Software distributed under the License is distributed on an "AS IS"
- * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
- * the License for the specific language governing rights and limitations
- * under the License.
- *
- * %CopyrightEnd%
- */
-
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-#include "sys.h"
-#include "error.h"
-#include "global.h"
-#include "bif.h"
-#include "big.h"
-#include "erl_binary.h"
-#include "hipe_perfctr.h"
-#include "libperfctr.h"
-
-static struct vperfctr *vperfctr;
-static unsigned int have_rdtsc;
-static double tsc_to_ms;
-static unsigned int tsc_on; /* control calls must set tsc_on if have_rdtsc is true */
-static unsigned int nractrs;
-static unsigned int users;
-#define USER_BIFS	(1<<0)
-#define USER_HRVTIME	(1<<1)
-
-static int hipe_perfctr_open(unsigned int user)
-{
-    struct perfctr_info info;
-
-    if (!vperfctr) {
-	vperfctr = vperfctr_open();
-	if (!vperfctr)
-	    return -1;
-	if (vperfctr_info(vperfctr, &info) >= 0) {
-	    tsc_to_ms = (double)(info.tsc_to_cpu_mult ? : 1) / (double)info.cpu_khz;
-	    have_rdtsc = (info.cpu_features & PERFCTR_FEATURE_RDTSC) ? 1 : 0;
-	}
-	tsc_on = 0;
-	nractrs = 0;
-    }
-    users |= user;
-    return 0;
-}
-
-static void hipe_perfctr_reset(void)
-{
-    struct vperfctr_control control;
-
-    memset(&control, 0, sizeof control);
-    if (have_rdtsc)
-	control.cpu_control.tsc_on = 1;
-    nractrs = 0;
-    if (vperfctr_control(vperfctr, &control) >= 0)
-	tsc_on = 1;
-}
-
-static void hipe_perfctr_close(unsigned int user)
-{
-    if (!vperfctr)
-	return;
-    users &= ~user;
-    switch (users) {
-      case 0:
-	vperfctr_unlink(vperfctr);
-	vperfctr_close(vperfctr);
-	vperfctr = NULL;
-	tsc_on = 0;
-	nractrs = 0;
-	break;
-      case USER_HRVTIME:
-	hipe_perfctr_reset();
-    }
-}
-
-/*
- * Interface for HiPE's hrvtime code.
- */
-
-int hipe_perfctr_hrvtime_open(void)
-{
-    if (hipe_perfctr_open(USER_HRVTIME) < 0)
-	return -1;
-    if (have_rdtsc) {
-	if (!tsc_on)
-	    hipe_perfctr_reset(); /* note: updates tsc_on */
-	if (tsc_on)
-	    return 0;
-    }
-    hipe_perfctr_hrvtime_close();
-    return -1;
-}
-
-void hipe_perfctr_hrvtime_close(void)
-{
-    hipe_perfctr_close(USER_HRVTIME);
-}
-
-double hipe_perfctr_hrvtime_get(void)
-{
-    return (double)vperfctr_read_tsc(vperfctr) * tsc_to_ms;
-}
-
-/*
- * BIF interface for user-programmable performance counters.
- */
-
-BIF_RETTYPE hipe_bifs_vperfctr_open_0(BIF_ALIST_0)
-{
-    if (hipe_perfctr_open(USER_BIFS) < 0)
-	BIF_RET(am_false); /* arity 0 BIFs can't fail :-( */
-    BIF_RET(am_true);
-}
-
-BIF_RETTYPE hipe_bifs_vperfctr_close_0(BIF_ALIST_0)
-{
-    hipe_perfctr_close(USER_BIFS);
-    BIF_RET(NIL);
-}
-
-static Eterm ull_to_integer(unsigned long long x, Process *p)
-{
-    unsigned long long tmpx;
-    unsigned int ds, i;
-    size_t sz;
-    Eterm *hp;
-    ErtsDigit *xp;
-
-    if (x <= (unsigned long long)MAX_SMALL)
-	return make_small(x);
-
-    /* Calculate number of digits. */
-    ds = 0;
-    tmpx = x;
-    do {
-	++ds;
-	tmpx = (tmpx >> (D_EXP / 2)) >> (D_EXP / 2);
-    } while (tmpx != 0);
-
-    sz = BIG_NEED_SIZE(ds);	/* number of words including arity */
-    hp = HAlloc(p, sz);
-    *hp = make_pos_bignum_header(sz-1);
-
-    xp = (ErtsDigit*)(hp+1);
-    i = 0;
-    do {
-	xp[i++] = (ErtsDigit)x;
-	x = (x >> (D_EXP / 2)) >> (D_EXP / 2);
-    } while (i < ds);
-    while (i & (BIG_DIGITS_PER_WORD-1))
-	xp[i++] = 0;
-
-    return make_big(hp);
-}
-
-BIF_RETTYPE hipe_bifs_vperfctr_info_0(BIF_ALIST_0)
-{
-    struct perfctr_info info;
-
-    if (!vperfctr || vperfctr_info(vperfctr, &info) < 0)
-	BIF_RET(am_false); /* arity 0 BIFs can't fail :-( */
-    BIF_RET(new_binary(BIF_P, (void*)&info, sizeof info));
-}
-
-BIF_RETTYPE hipe_bifs_vperfctr_read_tsc_0(BIF_ALIST_0)
-{
-    unsigned long long val;
-
-    if (!vperfctr || !tsc_on)
-	BIF_RET(am_false); /* arity 0 BIFs can't fail :-( */
-    val = vperfctr_read_tsc(vperfctr);
-    BIF_RET(ull_to_integer(val, BIF_P));
-}
-
-BIF_RETTYPE hipe_bifs_vperfctr_read_pmc_1(BIF_ALIST_1)
-{
-    Uint pmc;
-    unsigned long long val;
-
-    if (!vperfctr ||
-	is_not_small(BIF_ARG_1) ||
-	(pmc = unsigned_val(BIF_ARG_1), pmc >= nractrs))
-	BIF_RET(am_false); /* for consistency with the arity 0 BIFs */
-    val = vperfctr_read_pmc(vperfctr, pmc);
-    BIF_RET(ull_to_integer(val, BIF_P));
-}
-
-BIF_RETTYPE hipe_bifs_vperfctr_control_1(BIF_ALIST_1)
-{
-    void *bytes;
-    struct vperfctr_control control;
-    Uint bitoffs;
-    Uint bitsize;
-
-    if (!vperfctr)
-	BIF_ERROR(BIF_P, BADARG);
-    if (is_not_binary(BIF_ARG_1))
-	BIF_ERROR(BIF_P, BADARG);
-    if (binary_size(BIF_ARG_1) != sizeof control)
-	BIF_ERROR(BIF_P, BADARG);
-    ERTS_GET_BINARY_BYTES(BIF_ARG_1, bytes, bitoffs, bitsize);
-    ASSERT(bitoffs == 0);
-    ASSERT(bitsize == 0);
-    memcpy(&control, bytes, sizeof control);
-    if (have_rdtsc)
-	control.cpu_control.tsc_on = 1;
-    if (vperfctr_control(vperfctr, &control) < 0) {
-	hipe_perfctr_reset();
-	BIF_ERROR(BIF_P, BADARG);
-    }
-    tsc_on = control.cpu_control.tsc_on;
-    nractrs = control.cpu_control.nractrs;
-    BIF_RET(NIL);
-}