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drm/ttm: add debugfs entry to test pool shrinker v2 

Useful for testing.

v2: add fs_reclaim_acquire()/_release()

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/414955/
This commit is contained in:
Christian König 2020-12-18 16:11:22 +01:00
parent ba051901d1
commit 568517686f
1 changed files with 39 additions and 22 deletions
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61
drivers/gpu/drm/ttm/ttm_pool.c
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@ -33,6 +33,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/dma-mapping.h> #include <linux/dma-mapping.h>
#include <linux/sched/mm.h>
#ifdef CONFIG_X86 #ifdef CONFIG_X86
#include <asm/set_memory.h> #include <asm/set_memory.h>
@ -529,6 +530,28 @@ void ttm_pool_fini(struct ttm_pool *pool)
} }
EXPORT_SYMBOL(ttm_pool_fini); EXPORT_SYMBOL(ttm_pool_fini);
/* As long as pages are available make sure to release at least one */
static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
struct shrink_control *sc)
{
unsigned long num_freed = 0;
do
num_freed += ttm_pool_shrink();
while (!num_freed && atomic_long_read(&allocated_pages));
return num_freed;
}
/* Return the number of pages available or SHRINK_EMPTY if we have none */
static unsigned long ttm_pool_shrinker_count(struct shrinker *shrink,
struct shrink_control *sc)
{
unsigned long num_pages = atomic_long_read(&allocated_pages);
return num_pages ? num_pages : SHRINK_EMPTY;
}
#ifdef CONFIG_DEBUG_FS #ifdef CONFIG_DEBUG_FS
/* Count the number of pages available in a pool_type */ /* Count the number of pages available in a pool_type */
static unsigned int ttm_pool_type_count(struct ttm_pool_type *pt) static unsigned int ttm_pool_type_count(struct ttm_pool_type *pt)
@ -633,30 +656,22 @@ int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m)
} }
EXPORT_SYMBOL(ttm_pool_debugfs); EXPORT_SYMBOL(ttm_pool_debugfs);
/* Test the shrinker functions and dump the result */
static int ttm_pool_debugfs_shrink_show(struct seq_file *m, void *data)
{
struct shrink_control sc = { .gfp_mask = GFP_NOFS };
fs_reclaim_acquire(GFP_KERNEL);
seq_printf(m, "%lu/%lu\n", ttm_pool_shrinker_count(&mm_shrinker, &sc),
ttm_pool_shrinker_scan(&mm_shrinker, &sc));
fs_reclaim_release(GFP_KERNEL);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(ttm_pool_debugfs_shrink);
#endif #endif
/* As long as pages are available make sure to release at least one */
static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
struct shrink_control *sc)
{
unsigned long num_freed = 0;
do
num_freed += ttm_pool_shrink();
while (!num_freed && atomic_long_read(&allocated_pages));
return num_freed;
}
/* Return the number of pages available or SHRINK_EMPTY if we have none */
static unsigned long ttm_pool_shrinker_count(struct shrinker *shrink,
struct shrink_control *sc)
{
unsigned long num_pages = atomic_long_read(&allocated_pages);
return num_pages ? num_pages : SHRINK_EMPTY;
}
/** /**
* ttm_pool_mgr_init - Initialize globals * ttm_pool_mgr_init - Initialize globals
* *
@ -688,6 +703,8 @@ int ttm_pool_mgr_init(unsigned long num_pages)
#ifdef CONFIG_DEBUG_FS #ifdef CONFIG_DEBUG_FS
debugfs_create_file("page_pool", 0444, ttm_debugfs_root, NULL, debugfs_create_file("page_pool", 0444, ttm_debugfs_root, NULL,
&ttm_pool_debugfs_globals_fops); &ttm_pool_debugfs_globals_fops);
debugfs_create_file("page_pool_shrink", 0400, ttm_debugfs_root, NULL,
&ttm_pool_debugfs_shrink_fops);
#endif #endif
mm_shrinker.count_objects = ttm_pool_shrinker_count; mm_shrinker.count_objects = ttm_pool_shrinker_count;