mirror of
https://github.com/torvalds/linux.git
synced 2026-05-30 01:53:29 +02:00
c6135f67aa
In situations where the system is very short on RAM, the shmem readback from swap-space may invoke the OOM killer. However, since this might be a recoverable situation where the caller is indicating this by setting struct ttm_operation_ctx::gfp_retry_mayfail to true, adjust the gfp value used by the allocation accordingly. Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Maarten Lankhorst <dev@lankhorst.se> Acked-by: Christian König <christian.koening@amd.com> Link: https://patch.msgid.link/20260317141856.237876-3-thomas.hellstrom@linux.intel.com
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/* SPDX-License-Identifier: MIT */
|
|
/*
|
|
* Copyright © 2024 Intel Corporation
|
|
*/
|
|
|
|
#ifndef _TTM_BACKUP_H_
|
|
#define _TTM_BACKUP_H_
|
|
|
|
#include <linux/mm_types.h>
|
|
#include <linux/shmem_fs.h>
|
|
|
|
/**
|
|
* ttm_backup_handle_to_page_ptr() - Convert handle to struct page pointer
|
|
* @handle: The handle to convert.
|
|
*
|
|
* Converts an opaque handle received from the
|
|
* ttm_backup_backup_page() function to an (invalid)
|
|
* struct page pointer suitable for a struct page array.
|
|
*
|
|
* Return: An (invalid) struct page pointer.
|
|
*/
|
|
static inline struct page *
|
|
ttm_backup_handle_to_page_ptr(unsigned long handle)
|
|
{
|
|
return (struct page *)(handle << 1 | 1);
|
|
}
|
|
|
|
/**
|
|
* ttm_backup_page_ptr_is_handle() - Whether a struct page pointer is a handle
|
|
* @page: The struct page pointer to check.
|
|
*
|
|
* Return: true if the struct page pointer is a handld returned from
|
|
* ttm_backup_handle_to_page_ptr(). False otherwise.
|
|
*/
|
|
static inline bool ttm_backup_page_ptr_is_handle(const struct page *page)
|
|
{
|
|
return (unsigned long)page & 1;
|
|
}
|
|
|
|
/**
|
|
* ttm_backup_page_ptr_to_handle() - Convert a struct page pointer to a handle
|
|
* @page: The struct page pointer to convert
|
|
*
|
|
* Return: The handle that was previously used in
|
|
* ttm_backup_handle_to_page_ptr() to obtain a struct page pointer, suitable
|
|
* for use as argument in the struct ttm_backup_drop() or
|
|
* ttm_backup_copy_page() functions.
|
|
*/
|
|
static inline unsigned long
|
|
ttm_backup_page_ptr_to_handle(const struct page *page)
|
|
{
|
|
WARN_ON(!ttm_backup_page_ptr_is_handle(page));
|
|
return (unsigned long)page >> 1;
|
|
}
|
|
|
|
void ttm_backup_drop(struct file *backup, pgoff_t handle);
|
|
|
|
int ttm_backup_copy_page(struct file *backup, struct page *dst,
|
|
pgoff_t handle, bool intr, gfp_t additional_gfp);
|
|
|
|
s64
|
|
ttm_backup_backup_page(struct file *backup, struct page *page,
|
|
bool writeback, pgoff_t idx, gfp_t page_gfp,
|
|
gfp_t alloc_gfp);
|
|
|
|
void ttm_backup_fini(struct file *backup);
|
|
|
|
u64 ttm_backup_bytes_avail(void);
|
|
|
|
struct file *ttm_backup_shmem_create(loff_t size);
|
|
|
|
#endif
|