initial checkin of tool to analyze libosmocore logging latency
This commit is contained in:
commit
a3ee406b6e
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@ -0,0 +1,9 @@
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LIBS:=`pkg-config --libs libosmocore`
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CFLAGS:=-g -Wall `pkg-config --cflags libosmocore`
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osmo-logbench: osmo-logbench.o
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$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
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%.o: %.c
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$(CC) -o $@ -c $^
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@ -0,0 +1,22 @@
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#!/usr/bin/env bpftrace
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BEGIN
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{
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printf("Tracing libosmocore log latency... Hit Ctrl-C to end.\n");
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}
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usdt:/usr/local/lib/libosmocore.so.16.0.0:libosmocore:log_start
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{
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@start[tid] = nsecs;
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}
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usdt:/usr/local/lib/libosmocore.so.16.0.0:libosmocore:log_done
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{
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@usecs = hist((nsecs - @start[tid]) / 1000);
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delete(@start[tid]);
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}
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END
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{
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clear(@start);
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}
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@ -0,0 +1,246 @@
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From d08b4443ea1e5cd64a394832c4af685e06110fcc Mon Sep 17 00:00:00 2001
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From: Harald Welte <laforge@osmocom.org>
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Date: Sat, 26 Sep 2020 11:51:32 +0200
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Subject: [PATCH] initial support for static userspace probes via systemtap
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This adds a --enable-systemtap configure option, which will then
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add static tracepoints to the generated libosmocore binary.
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At this point, only two tracepoints are supported: stderr_start
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and stderr_done. They can be used to trace the amount of time
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a libosmocore-using application spends in blocking calls to log
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to stderr.
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Change-Id: I7e1ab664241deb524c9582cbd1bec31af46c747e
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---
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Makefile.am | 2 +-
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configure.ac | 33 +++++++++++++++++++++++++++++++++
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src/Makefile.am | 12 ++++++++++++
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src/logging.c | 23 ++++++++++++++++++++++-
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src/probes.d | 7 +++++++
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tapset/Makefile.am | 22 ++++++++++++++++++++++
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tapset/libosmocore.stp | 18 ++++++++++++++++++
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7 files changed, 115 insertions(+), 2 deletions(-)
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create mode 100644 src/probes.d
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create mode 100644 tapset/Makefile.am
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create mode 100644 tapset/libosmocore.stp
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diff --git a/Makefile.am b/Makefile.am
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index f2a05a96..ab2aad92 100644
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--- a/Makefile.am
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+++ b/Makefile.am
|
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@@ -1,7 +1,7 @@
|
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ACLOCAL_AMFLAGS = -I m4
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|
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AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
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-SUBDIRS = include src src/vty src/codec src/gsm src/coding src/gb src/ctrl src/sim src/pseudotalloc src/usb utils tests
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+SUBDIRS = include src src/vty src/codec src/gsm src/coding src/gb src/ctrl src/sim src/pseudotalloc src/usb utils tapset tests
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|
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pkgconfigdir = $(libdir)/pkgconfig
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pkgconfig_DATA = libosmocore.pc libosmocodec.pc libosmovty.pc libosmogsm.pc \
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diff --git a/configure.ac b/configure.ac
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index b07a3bd6..e26d8a8b 100644
|
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--- a/configure.ac
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+++ b/configure.ac
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@@ -392,6 +392,38 @@ AC_MSG_CHECKING([whether to enable ARM NEON instructions support])
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AC_MSG_RESULT([$neon])
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AM_CONDITIONAL(HAVE_NEON, [test "x$neon" != "xno"])
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+#
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+# SystemTap support
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+#
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+AC_MSG_CHECKING([whether to include systemtap tracing support])
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+AC_ARG_ENABLE([systemtap],
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+ [AS_HELP_STRING([--enable-systemtap],
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+ [Enable inclusion of systemtap trace support])],
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+ [ENABLE_SYSTEMTAP="${enableval}"], [ENABLE_SYSTEMTAP='no'])
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+AM_CONDITIONAL([ENABLE_SYSTEMTAP], [test x$ENABLE_SYSTEMTAP = xyes])
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+AC_MSG_RESULT(${ENABLE_SYSTEMTAP})
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+
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+if test "x${ENABLE_SYSTEMTAP}" = xyes; then
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+ # Additional configuration for --enable-systemtap is HERE
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+ AC_CHECK_PROGS(DTRACE, dtrace)
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+ if test -z "$DTRACE"; then
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+ AC_MSG_ERROR([dtrace not found])
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+ fi
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+ AC_CHECK_HEADER([sys/sdt.h], [SDT_H_FOUND='yes'],
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+ [SDT_H_FOUND='no';
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+ AC_MSG_ERROR([systemtap support needs sys/sdt.h header])])
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+ AC_DEFINE([HAVE_SYSTEMTAP], [1], [Define to 1 if using SystemTap probes.])
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+ AC_ARG_WITH([tapset-install-dir],
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+ [AS_HELP_STRING([--with-tapset-install-dir],
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+ [The absolute path where the tapset dir will be installed])],
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+ [if test "x${withval}" = x; then
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+ ABS_TAPSET_DIR="\$(datadir)/systemtap/tapset"
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+ else
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+ ABS_TAPSET_DIR="${withval}"
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+ fi], [ABS_TAPSET_DIR="\$(datadir)/systemtap/tapset"])
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+ AC_SUBST(ABS_TAPSET_DIR)
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+fi
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+
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|
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OSMO_AC_CODE_COVERAGE
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|
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@@ -446,6 +478,7 @@ AC_OUTPUT(
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src/gb/Makefile
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src/ctrl/Makefile
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src/pseudotalloc/Makefile
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+ tapset/Makefile
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tests/Makefile
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tests/atlocal
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utils/Makefile
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diff --git a/src/Makefile.am b/src/Makefile.am
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index 891b4a6f..f03ce559 100644
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--- a/src/Makefile.am
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+++ b/src/Makefile.am
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@@ -28,6 +28,7 @@ libosmocore_la_SOURCES = context.c timer.c timer_gettimeofday.c timer_clockgetti
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sockaddr_str.c \
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use_count.c \
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exec.c \
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+ probes.d \
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$(NULL)
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if HAVE_SSSE3
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@@ -71,5 +72,16 @@ if ENABLE_SERIAL
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libosmocore_la_SOURCES += serial.c
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endif
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+if ENABLE_SYSTEMTAP
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+probes.h: probes.d
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+ $(DTRACE) -C -h -s $< -o $@
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+
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+probes.lo: probes.d
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+ $(LIBTOOL) --mode=compile $(AM_V_lt) --tag=CC env CFLAGS="$(CFLAGS)" $(DTRACE) -C -G -s $< -o $@
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+
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+BUILT_SOURCES += probes.h probes.lo
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+libosmocore_la_LIBADD += probes.lo
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+endif
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+
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crc%gen.c: crcXXgen.c.tpl
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$(AM_V_GEN)sed -e's/XX/$*/g' $< > $@
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diff --git a/src/logging.c b/src/logging.c
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index 212b0b99..b480f0b5 100644
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--- a/src/logging.c
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+++ b/src/logging.c
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@@ -44,6 +44,17 @@
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#include <syslog.h>
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#endif
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+#ifdef HAVE_SYSTEMTAP
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+/* include the generated probes header and put markers in code */
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+#include "probes.h"
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+#define TRACE(probe) probe
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+#define TRACE_ENABLED(probe) probe ## _ENABLED()
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+#else
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+/* Wrap the probe to allow it to be removed when no systemtap available */
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+#define TRACE(probe)
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+#define TRACE_ENABLED(probe) (0)
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+#endif /* HAVE_SYSTEMTAP */
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+
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#include <time.h>
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#include <sys/time.h>
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#include <errno.h>
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@@ -642,9 +653,11 @@ void logp2(int subsys, unsigned int level, const char *file, int line, int cont,
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{
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va_list ap;
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+ LIBOSMOCORE_LOG_START();
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va_start(ap, format);
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osmo_vlogp(subsys, level, file, line, cont, format, ap);
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va_end(ap);
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+ LIBOSMOCORE_LOG_DONE();
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}
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|
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/*! Register a new log target with the logging core
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@@ -831,6 +844,14 @@ void log_set_category_filter(struct log_target *target, int category,
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}
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|
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#if (!EMBEDDED)
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+static void _stderr_output(struct log_target *target, unsigned int level,
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+ const char *log)
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+{
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+ LIBOSMOCORE_STDERR_START(strlen(log));
|
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+ fprintf(target->tgt_file.out, "%s", log);
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+ fflush(target->tgt_file.out);
|
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+ LIBOSMOCORE_STDERR_DONE();
|
||||
+}
|
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static void _file_output(struct log_target *target, unsigned int level,
|
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const char *log)
|
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{
|
||||
@@ -898,7 +919,7 @@ struct log_target *log_target_create_stderr(void)
|
||||
|
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target->type = LOG_TGT_TYPE_STDERR;
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target->tgt_file.out = stderr;
|
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- target->output = _file_output;
|
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+ target->output = _stderr_output;
|
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return target;
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#else
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return NULL;
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diff --git a/src/probes.d b/src/probes.d
|
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new file mode 100644
|
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index 00000000..12840577
|
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--- /dev/null
|
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+++ b/src/probes.d
|
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@@ -0,0 +1,7 @@
|
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+provider libosmocore {
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+ probe stderr_start(int); /* (int number of octets) */
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+ probe stderr_done()
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+
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+ probe log_start();
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+ probe log_done()
|
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+};
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diff --git a/tapset/Makefile.am b/tapset/Makefile.am
|
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new file mode 100644
|
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index 00000000..a07a3b1d
|
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--- /dev/null
|
||||
+++ b/tapset/Makefile.am
|
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@@ -0,0 +1,22 @@
|
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+.PHONY: clean-local install-data-hook uninstall-local
|
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+
|
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+EXTRA_DIST = libosmocore.stp
|
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+TAPSET_FILES = $(EXTRA_DIST)
|
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+TAPSET_INSTALL_DIR = $(DESTDIR)@ABS_TAPSET_DIR@
|
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+
|
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+if ENABLE_SYSTEMTAP
|
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+all-local: $(TAPSET_FILES)
|
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+
|
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+clean-local:
|
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+
|
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+install-data-hook:
|
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+ $(MKDIR_P) $(TAPSET_INSTALL_DIR)
|
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+ $(INSTALL_DATA) $(TAPSET_FILES) $(TAPSET_INSTALL_DIR)
|
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+
|
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+uninstall-local:
|
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+ @list='$(TAPSET_FILES)'; for p in $$list; do \
|
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+ echo " rm -f '$(TAPSET_INSTALL_DIR)/$$p'"; \
|
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+ rm -f "$(TAPSET_INSTALL_DIR)/$$p"; \
|
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+ done
|
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+
|
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+endif
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diff --git a/tapset/libosmocore.stp b/tapset/libosmocore.stp
|
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new file mode 100644
|
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index 00000000..10fa7b24
|
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--- /dev/null
|
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+++ b/tapset/libosmocore.stp
|
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@@ -0,0 +1,18 @@
|
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+/* libosmocore tapset
|
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+ *
|
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+ * This file is part of libosmocore.
|
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+ *
|
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+ * Each probe defines the probe name and a full probestr which consist of the probe name and between
|
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+ * brackets all argument names and values.
|
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+ */
|
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+
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+probe libosmocore_stderr_start = process("libosmocore").mark("stderr_start")
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+{
|
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+ count = $arg1;
|
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+ probestr = sprintf("%s(count=%d), $$name, count);
|
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+}
|
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+
|
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+probe libosmocore_stderr_done = process("libosmocore").mark("stderr_done")
|
||||
+{
|
||||
+ probestr = sprintf("%s", $$name);
|
||||
+}
|
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--
|
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2.28.0
|
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|
||||
|
|
@ -0,0 +1,47 @@
|
|||
#include <stdlib.h>
|
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|
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#include <osmocom/core/logging.h>
|
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#include <osmocom/core/application.h>
|
||||
|
||||
#define MAX_LINE_LEN 512
|
||||
|
||||
static unsigned int gen_len(void)
|
||||
{
|
||||
int rnd;
|
||||
do {
|
||||
rnd = rand() % MAX_LINE_LEN;
|
||||
} while (rnd <= 0);
|
||||
return rnd;
|
||||
}
|
||||
|
||||
static void fill_buf(char *buf, unsigned int len)
|
||||
{
|
||||
unsigned int i;
|
||||
for (i = 0; i < len; i++)
|
||||
buf[i] = 'a' + (i % 25);
|
||||
buf[len] = '\0';
|
||||
}
|
||||
|
||||
static void print_random_log(void)
|
||||
{
|
||||
char buf[MAX_LINE_LEN+1];
|
||||
fill_buf(buf, gen_len());
|
||||
|
||||
LOGP(DLGLOBAL, LOGL_ERROR, "stress: %s\n", buf);
|
||||
}
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
osmo_init_logging2(NULL, NULL);
|
||||
|
||||
#if 0
|
||||
log_target_destroy(osmo_stderr_target);
|
||||
struct log_target *tgt = log_target_create_gsmtap("localhost", 4729, "logbench", 0, 1);
|
||||
log_add_target(tgt);
|
||||
log_set_all_filter(tgt, 1);
|
||||
#endif
|
||||
|
||||
//for (int i = 0; i < 1000000; i++) {
|
||||
while (1) {
|
||||
print_random_log();
|
||||
}
|
||||
}
|
||||
|
|
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@usecs:
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[1] 2202080 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
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[2, 4) 26966 | |
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@usecs:
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[1G, 2G) 95 | |
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@ -0,0 +1,31 @@
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@usecs:
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[2, 4) 32387 |@@@ |
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[256, 512) 53 | |
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[512, 1K) 0 | |
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[8K, 16K) 0 | |
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[16K, 32K) 0 | |
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[32K, 64K) 39 | |
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[64K, 128K) 125 | |
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[32M, 64M) 0 | |
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[64M, 128M) 0 | |
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[128M, 256M) 0 | |
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[256M, 512M) 0 | |
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@usecs:
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[4, 8) 776978 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
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[8, 16) 1771 | |
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[16, 32) 60 | |
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[32, 64) 0 | |
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[64, 128) 1 | |
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[128, 256) 0 | |
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[256, 512) 0 | |
|
||||
[512, 1K) 0 | |
|
||||
[1K, 2K) 0 | |
|
||||
[2K, 4K) 0 | |
|
||||
[4K, 8K) 0 | |
|
||||
[8K, 16K) 0 | |
|
||||
[16K, 32K) 0 | |
|
||||
[32K, 64K) 0 | |
|
||||
[64K, 128K) 0 | |
|
||||
[128K, 256K) 0 | |
|
||||
[256K, 512K) 0 | |
|
||||
[512K, 1M) 0 | |
|
||||
[1M, 2M) 0 | |
|
||||
[2M, 4M) 0 | |
|
||||
[4M, 8M) 0 | |
|
||||
[8M, 16M) 0 | |
|
||||
[16M, 32M) 0 | |
|
||||
[32M, 64M) 0 | |
|
||||
[64M, 128M) 0 | |
|
||||
[128M, 256M) 0 | |
|
||||
[256M, 512M) 0 | |
|
||||
[512M, 1G) 0 | |
|
||||
[1G, 2G) 0 | |
|
||||
[2G, 4G) 82 | |
|
||||
|
|
@ -0,0 +1,31 @@
|
|||
@usecs:
|
||||
[2, 4) 2 | |
|
||||
[4, 8) 67887 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
|
||||
[8, 16) 30378 |@@@@@@@@@@@@@@@@@@@@@@@ |
|
||||
[16, 32) 58881 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
|
||||
[32, 64) 5188 |@@@ |
|
||||
[64, 128) 301 | |
|
||||
[128, 256) 61 | |
|
||||
[256, 512) 3963 |@@@ |
|
||||
[512, 1K) 7603 |@@@@@ |
|
||||
[1K, 2K) 407 | |
|
||||
[2K, 4K) 42 | |
|
||||
[4K, 8K) 20 | |
|
||||
[8K, 16K) 0 | |
|
||||
[16K, 32K) 0 | |
|
||||
[32K, 64K) 0 | |
|
||||
[64K, 128K) 0 | |
|
||||
[128K, 256K) 0 | |
|
||||
[256K, 512K) 0 | |
|
||||
[512K, 1M) 0 | |
|
||||
[1M, 2M) 0 | |
|
||||
[2M, 4M) 0 | |
|
||||
[4M, 8M) 0 | |
|
||||
[8M, 16M) 0 | |
|
||||
[16M, 32M) 0 | |
|
||||
[32M, 64M) 0 | |
|
||||
[64M, 128M) 0 | |
|
||||
[128M, 256M) 0 | |
|
||||
[256M, 512M) 0 | |
|
||||
[512M, 1G) 0 | |
|
||||
[1G, 2G) 1 | |
|
||||
|
|
@ -0,0 +1,31 @@
|
|||
@usecs:
|
||||
[2, 4) 107649 |@@@@@@@@ |
|
||||
[4, 8) 699672 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
|
||||
[8, 16) 15262 |@ |
|
||||
[16, 32) 622 | |
|
||||
[32, 64) 5840 | |
|
||||
[64, 128) 42728 |@@@ |
|
||||
[128, 256) 14000 |@ |
|
||||
[256, 512) 68 | |
|
||||
[512, 1K) 3 | |
|
||||
[1K, 2K) 0 | |
|
||||
[2K, 4K) 1 | |
|
||||
[4K, 8K) 0 | |
|
||||
[8K, 16K) 0 | |
|
||||
[16K, 32K) 0 | |
|
||||
[32K, 64K) 0 | |
|
||||
[64K, 128K) 0 | |
|
||||
[128K, 256K) 0 | |
|
||||
[256K, 512K) 0 | |
|
||||
[512K, 1M) 0 | |
|
||||
[1M, 2M) 0 | |
|
||||
[2M, 4M) 0 | |
|
||||
[4M, 8M) 0 | |
|
||||
[8M, 16M) 0 | |
|
||||
[16M, 32M) 0 | |
|
||||
[32M, 64M) 0 | |
|
||||
[64M, 128M) 0 | |
|
||||
[128M, 256M) 0 | |
|
||||
[256M, 512M) 0 | |
|
||||
[512M, 1G) 0 | |
|
||||
[1G, 2G) 50 | |
|
||||
|
|
@ -0,0 +1,30 @@
|
|||
[2, 4) 1060607 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
|
||||
[4, 8) 75133 |@@@ |
|
||||
[8, 16) 724 | |
|
||||
[16, 32) 107 | |
|
||||
[32, 64) 8 | |
|
||||
[64, 128) 8 | |
|
||||
[128, 256) 0 | |
|
||||
[256, 512) 0 | |
|
||||
[512, 1K) 0 | |
|
||||
[1K, 2K) 0 | |
|
||||
[2K, 4K) 0 | |
|
||||
[4K, 8K) 0 | |
|
||||
[8K, 16K) 0 | |
|
||||
[16K, 32K) 0 | |
|
||||
[32K, 64K) 0 | |
|
||||
[64K, 128K) 38 | |
|
||||
[128K, 256K) 0 | |
|
||||
[256K, 512K) 0 | |
|
||||
[512K, 1M) 0 | |
|
||||
[1M, 2M) 0 | |
|
||||
[2M, 4M) 0 | |
|
||||
[4M, 8M) 0 | |
|
||||
[8M, 16M) 0 | |
|
||||
[16M, 32M) 0 | |
|
||||
[32M, 64M) 0 | |
|
||||
[64M, 128M) 0 | |
|
||||
[128M, 256M) 0 | |
|
||||
[256M, 512M) 0 | |
|
||||
[512M, 1G) 0 | |
|
||||
[1G, 2G) 1 | |
|
||||
|
|
@ -0,0 +1,30 @@
|
|||
@usecs:
|
||||
[2, 4) 30 | |
|
||||
[4, 8) 199963 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
|
||||
[8, 16) 82294 |@@@@@@@@@@@@@@@@@@@@@ |
|
||||
[16, 32) 6897 |@ |
|
||||
[32, 64) 1649 | |
|
||||
[64, 128) 57 | |
|
||||
[128, 256) 221 | |
|
||||
[256, 512) 8588 |@@ |
|
||||
[512, 1K) 13062 |@@@ |
|
||||
[1K, 2K) 144 | |
|
||||
[2K, 4K) 14 | |
|
||||
[4K, 8K) 3 | |
|
||||
[8K, 16K) 0 | |
|
||||
[16K, 32K) 0 | |
|
||||
[32K, 64K) 0 | |
|
||||
[64K, 128K) 0 | |
|
||||
[128K, 256K) 0 | |
|
||||
[256K, 512K) 0 | |
|
||||
[512K, 1M) 0 | |
|
||||
[1M, 2M) 0 | |
|
||||
[2M, 4M) 0 | |
|
||||
[4M, 8M) 0 | |
|
||||
[8M, 16M) 0 | |
|
||||
[16M, 32M) 0 | |
|
||||
[32M, 64M) 0 | |
|
||||
[64M, 128M) 0 | |
|
||||
[128M, 256M) 0 | |
|
||||
[256M, 512M) 0 | |
|
||||
[512M, 1G) 28 | |
|
||||
Loading…
Reference in New Issue