wrapper/mm.h

   1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
   2  *
   3  * wrapper/mm.h
   4  *
   5  * Copyright (C) 2018 Francis Deslauriers <francis.deslauriers@efficios.com>
   6  */
   7
   8 #ifndef _LTTNG_WRAPPER_MM_H
   9 #define _LTTNG_WRAPPER_MM_H
  10
  11 #include <linux/mm.h>
  12 #include <linux/oom.h>
  13
  14 #include <lttng-kernel-version.h>
  15
  16 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0) \
  17                 || LTTNG_UBUNTU_KERNEL_RANGE(4,4,25,44, 4,5,0,0))
  18
  19 /*
  20  * Returns true if the current estimation of the number of page available is
  21  * larger than the number of pages passed as parameter.
  22  */
  23 static inline
  24 bool wrapper_check_enough_free_pages(unsigned long num_pages)
  25 {
  26         return num_pages < si_mem_available();
  27 }
  28
  29 #else
  30
  31 static inline
  32 bool wrapper_check_enough_free_pages(unsigned long num_pages)
  33 {
  34         /*
  35          * The si_mem_available function is not available on this kernel. Since
  36          * we can't reliably know if there is enough memory available, so we
  37          * return true.
  38          */
  39         return true;
  40 }
  41 #endif
  42
  43 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
  44 static inline
  45 void wrapper_set_current_oom_origin(void)
  46 {
  47         return set_current_oom_origin();
  48 }
  49
  50 static inline
  51 void wrapper_clear_current_oom_origin(void)
  52 {
  53         return clear_current_oom_origin();
  54 }
  55
  56 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)) */
  57
  58 static inline
  59 void wrapper_set_current_oom_origin(void)
  60 {
  61         return;
  62 }
  63
  64 static inline
  65 void wrapper_clear_current_oom_origin(void)
  66 {
  67         return;
  68 }
  69 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)) */
  70 #endif /* _LTTNG_WRAPPER_MM_H */