From: compudj <compudj@04897980-b3bd-0310-b5e0-8ef037075253>
Date: Tue, 7 Mar 2006 14:57:35 +0000 (+0000)
Subject: add usertrace-fast
X-Git-Tag: v0.12.20~1886
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=b09f3215c7a82327f4e572ad252ebf285ffe4707;p=lttv.git

add usertrace-fast

git-svn-id: http://ltt.polymtl.ca/svn@1603 04897980-b3bd-0310-b5e0-8ef037075253
---

diff --git a/usertrace-fast/Makefile b/usertrace-fast/Makefile
new file mode 100644
index 00000000..83c3b89f
--- /dev/null
+++ b/usertrace-fast/Makefile
@@ -0,0 +1,11 @@
+
+
+CC=gcc
+
+test: test.c lttng_usertrace.c
+	$(CC) $(CFLAGS) -lpthread -o $@ $^
+
+.PHONY : clean
+
+clean:
+	rm -fr *.o *~ test
diff --git a/usertrace-fast/lttng_usertrace.c b/usertrace-fast/lttng_usertrace.c
new file mode 100644
index 00000000..5e32b0cd
--- /dev/null
+++ b/usertrace-fast/lttng_usertrace.c
@@ -0,0 +1,252 @@
+
+/* LTTng user-space tracing code
+ *
+ * Copyright 2006 Mathieu Desnoyers
+ *
+ */
+
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+#include <syscall.h>
+#include <features.h>
+#include <pthread.h>
+#include <malloc.h>
+#include <string.h>
+
+#include "lttng_usertrace.h"
+
+#define MAX_TRACES 16
+
+
+/*
+ * Notes :
+ *
+ * ltt_update :
+ *
+ * it should send the information on the traces that has their status MODIFIED.
+ * It's a necessary assumption to have a correct lttng_free_trace_info, which
+ * would not be reentrant otherwise.
+ */
+
+
+/* TLS for the trace info
+ * http://www.dis.com/gnu/gcc/C--98-Thread-Local-Edits.html
+ *
+ * Add after paragraph 4
+ *
+ *     The storage for an object of thread storage duration shall be statically
+ *     initialized before the first statement of the thread startup function. An
+ *     object of thread storage duration shall not require dynamic
+ *     initialization.
+ * GCC extention permits init of a range.
+ */
+
+static __thread struct lttng_trace_info lttng_trace_info[MAX_TRACES] =
+{	[ 0 ... MAX_TRACES-1 ].active = 0,
+	[ 0 ... MAX_TRACES-1 ].filter = 0,
+	[ 0 ... MAX_TRACES-1 ].destroy = 0,
+	[ 0 ... MAX_TRACES-1 ].nesting = ATOMIC_INIT(0),
+	[ 0 ... MAX_TRACES-1 ].channel = 
+		{ NULL,
+			0,
+			ATOMIC_INIT(0),
+			ATOMIC_INIT(0),
+			ATOMIC_INIT(0),
+			ATOMIC_INIT(0),
+			ATOMIC_INIT(0)
+		}
+};
+
+
+/* Must be called we sure nobody else is using the info.
+ * It implies that the trace should have been previously stopped
+ * and that every writer has finished.
+ *
+ * Writers should always check if the trace must be destroyed when they
+ * finish writing and the nesting level is 0.
+ */
+void lttng_free_trace_info(struct lttng_trace_info *info)
+{
+	int ret;
+	
+	if(info->active) {
+		printf(
+		"LTTng ERROR : lttng_free_trace_info should be called on inactive trace\n");
+		exit(1);
+	}
+	if(!info->destroy) {
+		printf(
+		"LTTng ERROR : lttng_free_trace_info should be called on destroyed trace\n");
+		exit(1);
+	}
+	if(atomic_read(&info->nesting) > 0) {
+		printf(
+		"LTTng ERROR : lttng_free_trace_info should not be nested on tracing\n");
+		exit(1);
+	}
+	
+	/* Remove the maps */
+	ret = munmap(info->channel.cpu.start, info->channel.cpu.length);
+	if(ret) {
+		perror("LTTNG : error in munmap");
+	}
+	ret = munmap(info->channel.facilities.start, info->channel.facilities.length);
+	if(ret) {
+		perror("LTTNG : error in munmap");
+	}
+	
+	/* Zero the structure */
+	memset(info, 0, sizeof(struct lttng_trace_info));
+}
+
+
+static struct lttng_trace_info* find_info(unsigned long cpu_addr,
+		unsigned long fac_addr, unsigned int *first_empty)
+{
+	struct lttng_trace_info *found = NULL;
+	unsigned int i;
+
+	*first_empty = MAX_TRACES;
+
+	/* Try to find the trace */
+	for(i=0;i<MAX_TRACES;i++) {
+		if(i<*first_empty && !lttng_trace_info[i].channel.cpu.start)
+			*first_empty = i;
+		if(cpu_addr == 
+				(unsigned long)lttng_trace_info[i].channel.cpu.start &&
+			 fac_addr == 
+				(unsigned long)lttng_trace_info[i].channel.facilities.start) {
+			/* Found */
+			found = &lttng_trace_info[i];
+			break;
+		}
+	}
+	return found;
+}
+
+
+static void lttng_get_new_info(void)
+{
+	unsigned long cpu_addr, fac_addr;
+	unsigned int i, first_empty;
+	int active, filter, destroy;
+	int ret;
+	struct lttng_trace_info *info;
+	sigset_t set, oldset;
+
+	/* Disable signals */
+	ret = sigfillset(&set);
+	if(ret) {
+		printf("Error in sigfillset\n");
+		exit(1);
+	}
+	
+	ret = pthread_sigmask(SIG_BLOCK, &set, &oldset);
+	if(ret) {
+		printf("Error in sigprocmask\n");
+		exit(1);
+	}
+
+	/* Get all the new traces */
+	while(1) {
+		cpu_addr = fac_addr = 0;
+		active = filter = destroy = 0;
+		ret = ltt_update(&cpu_addr, &fac_addr, &active, &filter, &destroy);
+		if(ret) {
+			printf("LTTng : error in ltt_update\n");
+			exit(1);
+		}
+		
+		if(!cpu_addr || !fac_addr) break;
+		
+		info = find_info(cpu_addr, fac_addr, &first_empty);
+		if(info) {
+			info->filter = filter;
+			info->active = active;
+			info->destroy = destroy;
+			if(destroy && !atomic_read(&info->nesting))
+				lttng_free_trace_info(info);
+		} else {
+			/* Not found. Must take an empty slot */
+			if(first_empty == MAX_TRACES) {
+				printf(
+				"LTTng WARNING : too many traces requested for pid %d by the kernel.\n"
+				"                Compilation defined maximum is %u\n",
+					getpid(), MAX_TRACES);
+
+			} else {
+				info = &lttng_trace_info[first_empty];
+				info->channel.cpu.start = (void*)cpu_addr;
+				info->channel.cpu.length = PAGE_SIZE;
+				info->channel.facilities.start = (void*)fac_addr;
+				info->channel.facilities.length = PAGE_SIZE;
+				info->filter = filter;
+				info->active = active;
+				info->destroy = destroy;
+				if(destroy && !atomic_read(&info->nesting))
+					lttng_free_trace_info(info);
+			}
+		}
+	}
+
+	/* Enable signals */
+	ret = pthread_sigmask(SIG_SETMASK, &oldset, NULL);
+	if(ret) {
+		printf("Error in sigprocmask\n");
+		exit(1);
+	}
+}
+
+
+/* signal handler */
+void __lttng_sig_trace_handler(int signo)
+{
+  printf("LTTng signal handler : thread id : %lu, pid %lu\n", pthread_self(), getpid());
+	lttng_get_new_info();
+}
+
+
+static void thread_init(void)
+{
+	int err;
+	lttng_get_new_info();
+
+	/* Make some ltt_switch syscalls */
+	err = ltt_switch((unsigned long)NULL);
+	if(err) {
+		printf("Error in ltt_switch system call\n");
+		exit(1);
+	}
+}
+
+void __attribute__((constructor)) __lttng_user_init(void)
+{
+	static struct sigaction act;
+	int err;
+
+  printf("LTTng user init\n");
+
+	/* Activate the signal */
+	act.sa_handler = __lttng_sig_trace_handler;
+	err = sigemptyset(&(act.sa_mask));
+	if(err) perror("Error with sigemptyset");
+	err = sigaddset(&(act.sa_mask), SIGRTMIN+3);
+	if(err) perror("Error with sigaddset");
+	err = sigaction(SIGRTMIN+3, &act, NULL);
+	if(err) perror("Error with sigaction");
+
+	thread_init();
+}
+
+
+void lttng_thread_init(void)
+{
+	thread_init();
+}
+
+
diff --git a/usertrace-fast/lttng_usertrace.h b/usertrace-fast/lttng_usertrace.h
new file mode 100644
index 00000000..600be4ff
--- /dev/null
+++ b/usertrace-fast/lttng_usertrace.h
@@ -0,0 +1,61 @@
+
+/* LTTng user-space tracing header
+ *
+ * Copyright 2006 Mathieu Desnoyers
+ *
+ */
+
+#ifndef _LTTNG_USERTRACE_H
+#define _LTTNG_USERTRACE_H
+
+#include <errno.h>
+#include <syscall.h>
+
+#include <asm/atomic.h>
+
+//Put in asm-i486/unistd.h
+#define __NR_ltt_update	294
+#define __NR_ltt_switch	295
+
+#undef NR_syscalls
+#define NR_syscalls 296
+
+#ifndef _LIBC
+// Put in bits/syscall.h
+#define SYS_ltt_update	__NR_ltt_update
+#define SYS_ltt_switch	__NR_ltt_switch
+#endif
+
+struct ltt_buf {
+	void *start;
+	size_t length;
+	atomic_t	offset;
+	atomic_t	reserve_count;
+	atomic_t	commit_count;
+
+	atomic_t	events_lost;
+};
+
+struct lttng_trace_info {
+	int	active:1;
+	int destroy:1;
+	int filter;
+	atomic_t nesting;
+	struct {
+		struct ltt_buf facilities;
+		struct ltt_buf cpu;
+	} channel;
+};
+
+
+void __lttng_sig_trace_handler(int signo);
+
+/* Call this at the beginning of a new thread, except for the main() */
+void lttng_thread_init(void);
+
+void lttng_free_trace_info(struct lttng_trace_info *info);
+
+static inline _syscall1(int, ltt_switch, unsigned long, addr)
+static inline _syscall5(int, ltt_update, unsigned long *, cpu_addr, unsigned long *, fac_addr, int *, active, int *, filter, int *, destroy)
+
+#endif //_LTTNG_USERTRACE_H
diff --git a/usertrace-fast/test.c b/usertrace-fast/test.c
new file mode 100644
index 00000000..a0509a27
--- /dev/null
+++ b/usertrace-fast/test.c
@@ -0,0 +1,59 @@
+
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "lttng_usertrace.h"
+
+
+
+void *thr1(void *arg)
+{
+	lttng_thread_init();
+  printf("thread 1, thread id : %lu, pid %lu\n", pthread_self(), getpid());
+
+  while(1) {}
+
+  return ((void*)1);
+
+}
+
+void *thr2(void *arg)
+{
+	lttng_thread_init();
+
+  while(1) {
+    printf("thread 2, thread id : %lu, pid %lu\n", pthread_self(), getpid());
+    sleep(2);
+  }
+  return ((void*)2);
+}
+
+
+int main()
+{
+	int err;
+	pthread_t tid1, tid2;
+	void *tret;
+
+  printf("thread main, thread id : %lu, pid %lu\n", pthread_self(), getpid());
+  err = pthread_create(&tid1, NULL, thr1, NULL);
+  if(err!=0) exit(1);
+
+  err = pthread_create(&tid2, NULL, thr2, NULL);
+  if(err!=0) exit(1);
+
+  while(1)
+  {
+    
+  }
+
+  err = pthread_join(tid1, &tret);
+  if(err!= 0) exit(1);
+
+  err = pthread_join(tid2, &tret);
+  if(err!= 0) exit(1);
+  
+  return 0;
+}
diff --git a/usertrace-generic/Makefile b/usertrace-generic/Makefile
index 8291ac3f..292a5bc8 100644
--- a/usertrace-generic/Makefile
+++ b/usertrace-generic/Makefile
@@ -36,7 +36,7 @@ libltt-instrument-functions.so.0: ltt-instrument-functions.o ltt-facility-loader
 install:
 	if [ ! -e "$(INCLUDE_DIR)/ltt" ] ; then mkdir $(INCLUDE_DIR)/ltt ; fi
 	cp -f ltt/*.h $(INCLUDE_DIR)/ltt
-	cp -f libltt-instrument-functions.so* libltt-instrument-functions.a $(LIB_DIR)
+	cp -df libltt-instrument-functions.so* libltt-instrument-functions.a $(LIB_DIR)
 
 clean:
 	rm -fr *.o *~ sample-thread sample sample-highspeed sample-printf sample-instrument-fct libltt-instrument-functions.so* libltt-instrument-functions.a