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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/
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@ -33,6 +33,7 @@
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <linux/sched/mm.h>
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#ifdef CONFIG_X86
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#include <asm/set_memory.h>
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@ -529,6 +530,28 @@ void ttm_pool_fini(struct ttm_pool *pool)
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}
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EXPORT_SYMBOL(ttm_pool_fini);
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/* As long as pages are available make sure to release at least one */
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static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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unsigned long num_freed = 0;
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do
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num_freed += ttm_pool_shrink();
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while (!num_freed && atomic_long_read(&allocated_pages));
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return num_freed;
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}
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/* Return the number of pages available or SHRINK_EMPTY if we have none */
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static unsigned long ttm_pool_shrinker_count(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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unsigned long num_pages = atomic_long_read(&allocated_pages);
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return num_pages ? num_pages : SHRINK_EMPTY;
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}
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#ifdef CONFIG_DEBUG_FS
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/* Count the number of pages available in a pool_type */
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static unsigned int ttm_pool_type_count(struct ttm_pool_type *pt)
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@ -633,30 +656,22 @@ int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m)
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}
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EXPORT_SYMBOL(ttm_pool_debugfs);
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/* Test the shrinker functions and dump the result */
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static int ttm_pool_debugfs_shrink_show(struct seq_file *m, void *data)
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{
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struct shrink_control sc = { .gfp_mask = GFP_NOFS };
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fs_reclaim_acquire(GFP_KERNEL);
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seq_printf(m, "%lu/%lu\n", ttm_pool_shrinker_count(&mm_shrinker, &sc),
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ttm_pool_shrinker_scan(&mm_shrinker, &sc));
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fs_reclaim_release(GFP_KERNEL);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(ttm_pool_debugfs_shrink);
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#endif
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/* As long as pages are available make sure to release at least one */
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static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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unsigned long num_freed = 0;
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do
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num_freed += ttm_pool_shrink();
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while (!num_freed && atomic_long_read(&allocated_pages));
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return num_freed;
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}
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/* Return the number of pages available or SHRINK_EMPTY if we have none */
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static unsigned long ttm_pool_shrinker_count(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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unsigned long num_pages = atomic_long_read(&allocated_pages);
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return num_pages ? num_pages : SHRINK_EMPTY;
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}
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/**
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* ttm_pool_mgr_init - Initialize globals
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*
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@ -688,6 +703,8 @@ int ttm_pool_mgr_init(unsigned long num_pages)
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#ifdef CONFIG_DEBUG_FS
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debugfs_create_file("page_pool", 0444, ttm_debugfs_root, NULL,
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&ttm_pool_debugfs_globals_fops);
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debugfs_create_file("page_pool_shrink", 0400, ttm_debugfs_root, NULL,
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&ttm_pool_debugfs_shrink_fops);
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#endif
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mm_shrinker.count_objects = ttm_pool_shrinker_count;
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