[lttng-modules.git] / wrapper / mm.h

/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
 *
 * wrapper/mm.h
 *
 * Copyright (C) 2018 Francis Deslauriers <francis.deslauriers@efficios.com>
 */

#ifndef _LTTNG_WRAPPER_MM_H
#define _LTTNG_WRAPPER_MM_H

#include <linux/mm.h>
#include <linux/oom.h>

#include <lttng-kernel-version.h>

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0) \
		|| LTTNG_UBUNTU_KERNEL_RANGE(4,4,25,44, 4,5,0,0))

/*
 * Returns true if the current estimation of the number of page available is
 * larger than the number of pages passed as parameter.
 */
static inline
bool wrapper_check_enough_free_pages(unsigned long num_pages)
{
	return num_pages < si_mem_available();
}

#else

static inline
bool wrapper_check_enough_free_pages(unsigned long num_pages)
{
	/*
	 * The si_mem_available function is not available on this kernel. Since
	 * we can't reliably know if there is enough memory available, so we
	 * return true.
	 */
	return true;
}
#endif

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
static inline
void wrapper_set_current_oom_origin(void)
{
	return set_current_oom_origin();
}

static inline
void wrapper_clear_current_oom_origin(void)
{
	return clear_current_oom_origin();
}

#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)) */

static inline
void wrapper_set_current_oom_origin(void)
{
	return;
}

static inline
void wrapper_clear_current_oom_origin(void)
{
	return;
}
#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)) */
#endif /* _LTTNG_WRAPPER_MM_H */
Commit	Line	Data
	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 */