forked from Minki/linux
7e066fb870
Impact: API *CHANGE*. Must update all tracepoint users. Add DEFINE_TRACE() to tracepoints to let them declare the tracepoint structure in a single spot for all the kernel. It helps reducing memory consumption, especially when declaring a lot of tracepoints, e.g. for kmalloc tracing. *API CHANGE WARNING*: now, DECLARE_TRACE() must be used in headers for tracepoint declarations rather than DEFINE_TRACE(). This is the sane way to do it. The name previously used was misleading. Updates scheduler instrumentation to follow this API change. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Ingo Molnar <mingo@elte.hu>
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/* tracepoint-sample.c
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*
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* Executes a tracepoint when /proc/tracepoint-example is opened.
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*
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* (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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*
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* This file is released under the GPLv2.
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* See the file COPYING for more details.
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/proc_fs.h>
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#include "tp-samples-trace.h"
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DEFINE_TRACE(subsys_event);
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DEFINE_TRACE(subsys_eventb);
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struct proc_dir_entry *pentry_example;
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static int my_open(struct inode *inode, struct file *file)
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{
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int i;
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trace_subsys_event(inode, file);
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for (i = 0; i < 10; i++)
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trace_subsys_eventb();
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return -EPERM;
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}
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static struct file_operations mark_ops = {
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.open = my_open,
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};
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static int example_init(void)
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{
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printk(KERN_ALERT "example init\n");
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pentry_example = proc_create("tracepoint-example", 0444, NULL,
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&mark_ops);
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if (!pentry_example)
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return -EPERM;
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return 0;
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}
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static void example_exit(void)
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{
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printk(KERN_ALERT "example exit\n");
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remove_proc_entry("tracepoint-example", NULL);
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}
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module_init(example_init)
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module_exit(example_exit)
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mathieu Desnoyers");
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MODULE_DESCRIPTION("Tracepoint example");
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