TTM during the transition to the new page allocator lost the ability to constrain the allocations via the lower_mem_limit. The code has been unused since the change: 256dd44bd897 ("drm/ttm: nuke old page allocator") and there's no reason to keep it.
Signed-off-by: Zack Rusin zackr@vmware.com --- drivers/gpu/drm/vmwgfx/ttm_memory.c | 99 +---------------------------- drivers/gpu/drm/vmwgfx/ttm_memory.h | 6 +- 2 files changed, 2 insertions(+), 103 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/ttm_memory.c b/drivers/gpu/drm/vmwgfx/ttm_memory.c index edd17c30d5a5..2ced4c06ca45 100644 --- a/drivers/gpu/drm/vmwgfx/ttm_memory.c +++ b/drivers/gpu/drm/vmwgfx/ttm_memory.c @@ -34,7 +34,6 @@ #include <linux/mm.h> #include <linux/module.h> #include <linux/slab.h> -#include <linux/swap.h>
#include <drm/drm_device.h> #include <drm/drm_file.h> @@ -173,69 +172,7 @@ static struct kobj_type ttm_mem_zone_kobj_type = { .sysfs_ops = &ttm_mem_zone_ops, .default_attrs = ttm_mem_zone_attrs, }; - -static struct attribute ttm_mem_global_lower_mem_limit = { - .name = "lower_mem_limit", - .mode = S_IRUGO | S_IWUSR -}; - -static ssize_t ttm_mem_global_show(struct kobject *kobj, - struct attribute *attr, - char *buffer) -{ - struct ttm_mem_global *glob = - container_of(kobj, struct ttm_mem_global, kobj); - uint64_t val = 0; - - spin_lock(&glob->lock); - val = glob->lower_mem_limit; - spin_unlock(&glob->lock); - /* convert from number of pages to KB */ - val <<= (PAGE_SHIFT - 10); - return snprintf(buffer, PAGE_SIZE, "%llu\n", - (unsigned long long) val); -} - -static ssize_t ttm_mem_global_store(struct kobject *kobj, - struct attribute *attr, - const char *buffer, - size_t size) -{ - int chars; - uint64_t val64; - unsigned long val; - struct ttm_mem_global *glob = - container_of(kobj, struct ttm_mem_global, kobj); - - chars = sscanf(buffer, "%lu", &val); - if (chars == 0) - return size; - - val64 = val; - /* convert from KB to number of pages */ - val64 >>= (PAGE_SHIFT - 10); - - spin_lock(&glob->lock); - glob->lower_mem_limit = val64; - spin_unlock(&glob->lock); - - return size; -} - -static struct attribute *ttm_mem_global_attrs[] = { - &ttm_mem_global_lower_mem_limit, - NULL -}; - -static const struct sysfs_ops ttm_mem_global_ops = { - .show = &ttm_mem_global_show, - .store = &ttm_mem_global_store, -}; - -static struct kobj_type ttm_mem_glob_kobj_type = { - .sysfs_ops = &ttm_mem_global_ops, - .default_attrs = ttm_mem_global_attrs, -}; +static struct kobj_type ttm_mem_glob_kobj_type = {0};
static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob, bool from_wq, uint64_t extra) @@ -435,11 +372,6 @@ int ttm_mem_global_init(struct ttm_mem_global *glob, struct device *dev)
si_meminfo(&si);
- spin_lock(&glob->lock); - /* set it as 0 by default to keep original behavior of OOM */ - glob->lower_mem_limit = 0; - spin_unlock(&glob->lock); - ret = ttm_mem_init_kernel_zone(glob, &si); if (unlikely(ret != 0)) goto out_no_zone; @@ -527,35 +459,6 @@ void ttm_mem_global_free(struct ttm_mem_global *glob, } EXPORT_SYMBOL(ttm_mem_global_free);
-/* - * check if the available mem is under lower memory limit - * - * 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 disk is bigger than swap_mem_limit, allow TTM allocation. - */ -bool -ttm_check_under_lowerlimit(struct ttm_mem_global *glob, - uint64_t num_pages, - struct ttm_operation_ctx *ctx) -{ - int64_t available; - - /* We allow over commit during suspend */ - if (ctx->force_alloc) - return false; - - available = get_nr_swap_pages() + si_mem_available(); - available -= num_pages; - if (available < glob->lower_mem_limit) - return true; - - return false; -} - static int ttm_mem_global_reserve(struct ttm_mem_global *glob, struct ttm_mem_zone *single_zone, uint64_t amount, bool reserve) diff --git a/drivers/gpu/drm/vmwgfx/ttm_memory.h b/drivers/gpu/drm/vmwgfx/ttm_memory.h index c50dba774485..7b0d617ebcb1 100644 --- a/drivers/gpu/drm/vmwgfx/ttm_memory.h +++ b/drivers/gpu/drm/vmwgfx/ttm_memory.h @@ -50,8 +50,6 @@ * @work: The workqueue callback for the shrink queue. * @lock: Lock to protect the @shrink - and the memory accounting members, * that is, essentially the whole structure with some exceptions. - * @lower_mem_limit: include lower limit of swap space and lower limit of - * system memory. * @zones: Array of pointers to accounting zones. * @num_zones: Number of populated entries in the @zones array. * @zone_kernel: Pointer to the kernel zone. @@ -69,7 +67,6 @@ extern struct ttm_mem_global { struct workqueue_struct *swap_queue; struct work_struct work; spinlock_t lock; - uint64_t lower_mem_limit; struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES]; unsigned int num_zones; struct ttm_mem_zone *zone_kernel; @@ -91,6 +88,5 @@ int ttm_mem_global_alloc_page(struct ttm_mem_global *glob, void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page, uint64_t size); size_t ttm_round_pot(size_t size); -bool ttm_check_under_lowerlimit(struct ttm_mem_global *glob, uint64_t num_pages, - struct ttm_operation_ctx *ctx); + #endif