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Related upstream commit:
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commit 10e1cf6b73f1598e57d24933a0949dbeffa2c8a0
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Author: Siddhesh Poyarekar <siddhesh@redhat.com>
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Date: Fri Oct 11 22:37:53 2013 +0530
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Add systemtap markers to math function slow paths
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diff -rup glibc-2.17-c758a686/sysdeps/ieee754/dbl-64/slowexp.c glibc-2.17-c758a686/sysdeps/ieee754/dbl-64/slowexp.c
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--- glibc-2.17-c758a686/sysdeps/ieee754/dbl-64/slowexp.c 2012-05-20 19:47:38.000000000 -0600
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+++ glibc-2.17-c758a686/sysdeps/ieee754/dbl-64/slowexp.c 2012-05-21 10:02:51.693957300 -0600
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@@ -30,6 +30,8 @@
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#include "mpa.h"
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#include <math_private.h>
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+#include <stap-probe.h>
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+
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#ifndef SECTION
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# define SECTION
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#endif
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@@ -60,12 +62,21 @@ __slowexp(double x) {
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__sub(&mpy,&mpcor,&mpz,p);
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__mp_dbl(&mpw, &w, p);
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__mp_dbl(&mpz, &z, p);
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- if (w == z) return w;
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+ if (w == z) {
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+ /* Track how often we get to the slow exp code plus
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+ its input/output values. */
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+ LIBC_PROBE (slowexp_p6, 2, &x, &w);
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+ return w;
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+ }
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else { /* if calculating is not exactly */
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p = 32;
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__dbl_mp(x,&mpx,p);
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__mpexp(&mpx, &mpy, p);
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__mp_dbl(&mpy, &res, p);
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+
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+ /* Track how often we get to the uber-slow exp code plus
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+ its input/output values. */
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+ LIBC_PROBE (slowexp_p32, 2, &x, &res;;
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return res;
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}
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}
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diff -rup glibc-2.17-c758a686/sysdeps/ieee754/dbl-64/slowpow.c glibc-2.17-c758a686/sysdeps/ieee754/dbl-64/slowpow.c
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--- glibc-2.17-c758a686/sysdeps/ieee754/dbl-64/slowpow.c 2012-05-20 19:47:38.000000000 -0600
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+++ glibc-2.17-c758a686/sysdeps/ieee754/dbl-64/slowpow.c 2012-05-21 10:02:51.694957291 -0600
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@@ -34,6 +34,8 @@
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#include "mpa.h"
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#include <math_private.h>
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+#include <stap-probe.h>
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+
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#ifndef SECTION
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# define SECTION
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#endif
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@@ -65,7 +67,12 @@ __slowpow(double x, double y, double z)
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__mp_dbl(&mpr, &res, p);
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__sub(&mpp,&eps,&mpr1,p); /* pp -eps =r1 */
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__mp_dbl(&mpr1, &res1, p); /* converting into double precision */
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- if (res == res1) return res;
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+ if (res == res1) {
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+ /* Track how often we get to the slow pow code plus
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+ its input/output values. */
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+ LIBC_PROBE (slowpow_p10, 4, &x, &y, &z, &res;;
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+ return res;
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+ }
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p = 32; /* if we get here result wasn't calculated exactly, continue */
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__dbl_mp(x,&mpx,p); /* for more exact calculation */
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@@ -75,5 +82,10 @@ __slowpow(double x, double y, double z)
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__mul(&mpy,&mpz,&mpw,p); /* y*z =w */
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__mpexp(&mpw, &mpp, p); /* e^w=pp */
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__mp_dbl(&mpp, &res, p); /* converting into double precision */
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+
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+ /* Track how often we get to the uber-slow pow code plus
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+ its input/output values. */
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+ LIBC_PROBE (slowpow_p32, 4, &x, &y, &z, &res;;
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+
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return res;
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}
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