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Subject[RFC patch 08/12] LTTng instrumentation FS tracepoint probes
Create a module which declares FS tracepoint probes, using markers.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Alexander Viro <viro@zeniv.linux.org.uk>
CC: 'Peter Zijlstra' <peterz@infradead.org>
CC: "Frank Ch. Eigler" <fche@redhat.com>
CC: 'Ingo Molnar' <mingo@elte.hu>
CC: 'Hideo AOKI' <haoki@redhat.com>
CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
CC: 'Steven Rostedt' <rostedt@goodmis.org>
CC: Masami Hiramatsu <mhiramat@redhat.com>
---
fs/Makefile | 1
fs/fs-trace.c | 167 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 168 insertions(+)
Index: linux-2.6-lttng/fs/fs-trace.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6-lttng/fs/fs-trace.c 2008-07-04 19:30:42.000000000 -0400
@@ -0,0 +1,167 @@
+/*
+ * fs/fs-trace.c
+ *
+ * FS tracepoint probes.
+ */
+
+#include <linux/module.h>
+#include <linux/buffer_head.h>
+#include "fs-trace.h"
+
+static void probe_fs_buffer_wait_start(struct buffer_head *bh)
+{
+ trace_mark(fs_buffer_wait_start, "bh %p", bh);
+}
+
+static void probe_fs_buffer_wait_end(struct buffer_head *bh)
+{
+ trace_mark(fs_buffer_wait_end, "bh %p", bh);
+}
+
+static void probe_fs_exec(char *filename)
+{
+ trace_mark(fs_exec, "filename %s", filename);
+}
+
+static void probe_fs_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
+{
+ trace_mark(fs_ioctl, "fd %u cmd %u arg %lu", fd, cmd, arg);
+}
+
+static void probe_fs_open(int fd, char *filename)
+{
+ trace_mark(fs_open, "fd %d filename %s", fd, filename);
+}
+
+static void probe_fs_close(unsigned int fd)
+{
+ trace_mark(fs_close, "fd %u", fd);
+}
+
+static void probe_fs_lseek(unsigned int fd, long offset, unsigned int origin)
+{
+ trace_mark(fs_lseek, "fd %u offset %ld origin %u", fd, offset, origin);
+}
+
+static void probe_fs_llseek(unsigned int fd, loff_t offset, unsigned int origin)
+{
+ trace_mark(fs_llseek, "fd %u offset %lld origin %u", fd,
+ (long long)offset, origin);
+}
+
+static void probe_fs_read(unsigned int fd, char __user *buf, size_t count,
+ ssize_t ret)
+{
+ trace_mark(fs_read, "fd %u count %zu", fd, count);
+}
+
+static void probe_fs_write(unsigned int fd, const char __user *buf,
+ size_t count, ssize_t ret)
+{
+ trace_mark(fs_write, "fd %u count %zu", fd, count);
+}
+
+static void probe_fs_pread64(unsigned int fd, char __user *buf, size_t count,
+ loff_t pos, ssize_t ret)
+{
+ trace_mark(fs_pread64, "fd %u count %zu pos %llu",
+ fd, count, (unsigned long long)pos);
+}
+
+static void probe_fs_pwrite64(unsigned int fd, const char __user *buf,
+ size_t count, loff_t pos, ssize_t ret)
+{
+ trace_mark(fs_pwrite64, "fd %u count %zu pos %llu",
+ fd, count, (unsigned long long)pos);
+}
+
+static void probe_fs_readv(unsigned long fd, const struct iovec __user *vec,
+ unsigned long vlen, ssize_t ret)
+{
+ trace_mark(fs_readv, "fd %lu vlen %lu", fd, vlen);
+}
+
+static void probe_fs_writev(unsigned long fd, const struct iovec __user *vec,
+ unsigned long vlen, ssize_t ret)
+{
+ trace_mark(fs_writev, "fd %lu vlen %lu", fd, vlen);
+}
+
+static void probe_fs_select(int fd, s64 timeout)
+{
+ trace_mark(fs_select, "fd %d timeout #8d%lld", fd, (long long)timeout);
+}
+
+static void probe_fs_poll(int fd)
+{
+ trace_mark(fs_pollfd, "fd %d", fd);
+}
+
+
+int __init fs_trace_init(void)
+{
+ int ret;
+
+ ret = register_trace_fs_buffer_wait_start(probe_fs_buffer_wait_start);
+ WARN_ON(ret);
+ ret = register_trace_fs_buffer_wait_end(probe_fs_buffer_wait_end);
+ WARN_ON(ret);
+ ret = register_trace_fs_exec(probe_fs_exec);
+ WARN_ON(ret);
+ ret = register_trace_fs_ioctl(probe_fs_ioctl);
+ WARN_ON(ret);
+ ret = register_trace_fs_open(probe_fs_open);
+ WARN_ON(ret);
+ ret = register_trace_fs_close(probe_fs_close);
+ WARN_ON(ret);
+ ret = register_trace_fs_lseek(probe_fs_lseek);
+ WARN_ON(ret);
+ ret = register_trace_fs_llseek(probe_fs_llseek);
+ WARN_ON(ret);
+ ret = register_trace_fs_read(probe_fs_read);
+ WARN_ON(ret);
+ ret = register_trace_fs_write(probe_fs_write);
+ WARN_ON(ret);
+ ret = register_trace_fs_pread64(probe_fs_pread64);
+ WARN_ON(ret);
+ ret = register_trace_fs_pwrite64(probe_fs_pwrite64);
+ WARN_ON(ret);
+ ret = register_trace_fs_readv(probe_fs_readv);
+ WARN_ON(ret);
+ ret = register_trace_fs_writev(probe_fs_writev);
+ WARN_ON(ret);
+ ret = register_trace_fs_select(probe_fs_select);
+ WARN_ON(ret);
+ ret = register_trace_fs_poll(probe_fs_poll);
+ WARN_ON(ret);
+
+ return 0;
+}
+
+module_init(fs_trace_init);
+
+void __exit fs_trace_exit(void)
+{
+ unregister_trace_fs_poll(probe_fs_poll);
+ unregister_trace_fs_select(probe_fs_select);
+ unregister_trace_fs_writev(probe_fs_writev);
+ unregister_trace_fs_readv(probe_fs_readv);
+ unregister_trace_fs_pwrite64(probe_fs_pwrite64);
+ unregister_trace_fs_pread64(probe_fs_pread64);
+ unregister_trace_fs_write(probe_fs_write);
+ unregister_trace_fs_read(probe_fs_read);
+ unregister_trace_fs_llseek(probe_fs_llseek);
+ unregister_trace_fs_lseek(probe_fs_lseek);
+ unregister_trace_fs_close(probe_fs_close);
+ unregister_trace_fs_open(probe_fs_open);
+ unregister_trace_fs_ioctl(probe_fs_ioctl);
+ unregister_trace_fs_exec(probe_fs_exec);
+ unregister_trace_fs_buffer_wait_end(probe_fs_buffer_wait_end);
+ unregister_trace_fs_buffer_wait_start(probe_fs_buffer_wait_start);
+}
+
+module_exit(fs_trace_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("FS Tracepoint Probes");
Index: linux-2.6-lttng/fs/Makefile
===================================================================
--- linux-2.6-lttng.orig/fs/Makefile 2008-07-04 19:21:32.000000000 -0400
+++ linux-2.6-lttng/fs/Makefile 2008-07-04 19:26:08.000000000 -0400
@@ -63,6 +63,7 @@ obj-$(CONFIG_CONFIGFS_FS) += configfs/
obj-y += devpts/

obj-$(CONFIG_PROFILING) += dcookies.o
+obj-$(CONFIG_TRACEPROBES) += fs-trace.o
obj-$(CONFIG_DLM) += dlm/

# Do not add any filesystems before this line
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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