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the free mem space and the lower limit both include two parts:
system memory and swap space.
For the OOM triggered by TTM, that is the case as below:
first swap space is full of swapped out pages and soon
system memory also is filled up with ttm pages. and then
any memory allocation request will run into OOM.
to cover two cases:
a. if no swap disk at all or free swap space is under swap mem
limit but available system mem is bigger than sys mem limit,
allow TTM allocation;
b. if the available system mem is less than sys mem limit but
free swap space is bigger than swap mem limit, allow TTM
allocation.
v2: merge two memory limit(swap and system) into one
v3: keep original behavior except ttm_opt_ctx->flags with
TTM_OPT_FLAG_FORCE_ALLOC
v4: always set force_alloc as tx->flags & TTM_OPT_FLAG_FORCE_ALLOC
v5: add an attribute for lower_mem_limit
v6: set lower_mem_limit as 0 to keep original behavior
Signed-off-by: Roger He <Hongbo.He@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
99 lines
4.0 KiB
C
99 lines
4.0 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#ifndef TTM_MEMORY_H
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#define TTM_MEMORY_H
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#include <linux/workqueue.h>
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#include <linux/spinlock.h>
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#include <linux/bug.h>
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#include <linux/wait.h>
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#include <linux/errno.h>
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#include <linux/kobject.h>
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#include <linux/mm.h>
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#include "ttm_bo_api.h"
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/**
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* struct ttm_mem_global - Global memory accounting structure.
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*
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* @shrink: A single callback to shrink TTM memory usage. Extend this
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* to a linked list to be able to handle multiple callbacks when needed.
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* @swap_queue: A workqueue to handle shrinking in low memory situations. We
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* need a separate workqueue since it will spend a lot of time waiting
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* for the GPU, and this will otherwise block other workqueue tasks(?)
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* At this point we use only a single-threaded workqueue.
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* @work: The workqueue callback for the shrink queue.
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* @lock: Lock to protect the @shrink - and the memory accounting members,
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* that is, essentially the whole structure with some exceptions.
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* @lower_mem_limit: include lower limit of swap space and lower limit of
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* system memory.
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* @zones: Array of pointers to accounting zones.
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* @num_zones: Number of populated entries in the @zones array.
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* @zone_kernel: Pointer to the kernel zone.
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* @zone_highmem: Pointer to the highmem zone if there is one.
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* @zone_dma32: Pointer to the dma32 zone if there is one.
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*
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* Note that this structure is not per device. It should be global for all
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* graphics devices.
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*/
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#define TTM_MEM_MAX_ZONES 2
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struct ttm_mem_zone;
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struct ttm_mem_global {
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struct kobject kobj;
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struct ttm_bo_global *bo_glob;
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struct workqueue_struct *swap_queue;
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struct work_struct work;
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spinlock_t lock;
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uint64_t lower_mem_limit;
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struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
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unsigned int num_zones;
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struct ttm_mem_zone *zone_kernel;
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#ifdef CONFIG_HIGHMEM
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struct ttm_mem_zone *zone_highmem;
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#else
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struct ttm_mem_zone *zone_dma32;
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#endif
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};
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extern int ttm_mem_global_init(struct ttm_mem_global *glob);
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extern void ttm_mem_global_release(struct ttm_mem_global *glob);
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extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
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struct ttm_operation_ctx *ctx);
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extern void ttm_mem_global_free(struct ttm_mem_global *glob,
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uint64_t amount);
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extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
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struct page *page, uint64_t size,
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struct ttm_operation_ctx *ctx);
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extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
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struct page *page, uint64_t size);
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extern size_t ttm_round_pot(size_t size);
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extern uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob);
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extern bool ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
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uint64_t num_pages, struct ttm_operation_ctx *ctx);
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#endif
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