probes/lttng-probe-writeback.c

   1 /*
   2  * probes/lttng-probe-writeback.c
   3  *
   4  * LTTng writeback probes.
   5  *
   6  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  * Copyright (C) 2012 Mentor Graphics Corp.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; only
  12  * version 2.1 of the License.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/device.h>
  26 #include <linux/mm.h>
  27
  28 /*
  29  * Create the tracepoint static inlines from the kernel to validate that our
  30  * trace event macros match the kernel we run on.
  31  */
  32 #include <trace/events/writeback.h>
  33
  34 #include "../lttng-kernel-version.h"
  35
  36 /* #if <check version number if global_dirty_limit will be exported> */
  37 #ifdef CONFIG_KALLSYMS
  38 #include "../wrapper/kallsyms.h"
  39
  40 static unsigned long *wrapper_global_dirty_limit_sym = 0;
  41 static inline
  42 unsigned long wrapper_global_dirty_limit(void)
  43 {
  44         if (!wrapper_global_dirty_limit_sym)
  45                 wrapper_global_dirty_limit_sym =
  46                         (void *)kallsyms_lookup_funcptr("global_dirty_limit");
  47         if (wrapper_global_dirty_limit_sym)
  48                 return *wrapper_global_dirty_limit_sym;
  49         else {
  50                 printk(KERN_WARNING "LTTng: global_dirty_limit symbol lookup failed.\n");
  51                 return 0;
  52         }
  53 }
  54 #define global_dirty_limit wrapper_global_dirty_limit()
  55 #endif
  56 /* #endif <check version number> */
  57
  58 /*
  59  * Create LTTng tracepoint probes.
  60  */
  61 #define LTTNG_PACKAGE_BUILD
  62 #define CREATE_TRACE_POINTS
  63 #define TRACE_INCLUDE_PATH ../instrumentation/events/lttng-module
  64
  65 #include "../instrumentation/events/lttng-module/writeback.h"
  66
  67 MODULE_LICENSE("GPL and additional rights");
  68 MODULE_AUTHOR("Andrew Gabbasov <andrew_gabbasov@mentor.com>");
  69 MODULE_DESCRIPTION("LTTng writeback probes");