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Commit eccb867f authored by Park Ju Hyung's avatar Park Ju Hyung Committed by KakatkarAkshay
Browse files

dma_buf: use kmem_cache pool for struct sync_file 



These get allocated and freed millions of times on this kernel tree.

Use a dedicated kmem_cache pool and avoid costly dynamic memory allocations.

Signed-off-by: default avatarPark Ju Hyung <qkrwngud825@gmail.com>
Signed-off-by: default avatarAdam W. Willis <return.of.octobot@gmail.com>
Signed-off-by: default avatarLibXZR <xzr467706992@163.com>
parent 9c52a628

drivers/dma-buf/sync_file.c

+9 −3
Original line number Diff line number Diff line
@@ -27,12 +27,18 @@ 
#include <uapi/linux/sync_file.h>



static const struct file_operations sync_file_fops;

static struct kmem_cache *kmem_sync_file_pool;



void __init init_sync_kmem_pool(void)

{

	kmem_sync_file_pool = KMEM_CACHE(sync_file, SLAB_HWCACHE_ALIGN | SLAB_PANIC);

}



static struct sync_file *sync_file_alloc(void)

{

	struct sync_file *sync_file;



	sync_file = kzalloc(sizeof(*sync_file), GFP_KERNEL);

	sync_file = kmem_cache_zalloc(kmem_sync_file_pool, GFP_KERNEL);

	if (!sync_file)

		return NULL;
@@ -48,7 +54,7 @@ static struct sync_file *sync_file_alloc(void) 
	return sync_file;



err:

	kfree(sync_file);

	kmem_cache_free(kmem_sync_file_pool, sync_file);

	return NULL;

}
@@ -276,7 +282,7 @@ static int sync_file_release(struct inode *inode, struct file *file) 
	if (test_bit(POLL_ENABLED, &sync_file->flags))

		dma_fence_remove_callback(sync_file->fence, &sync_file->cb);

	dma_fence_put(sync_file->fence);

	kfree(sync_file);

	kmem_cache_free(kmem_sync_file_pool, sync_file);



	return 0;

}

init/main.c

+2 −0
Original line number Diff line number Diff line
@@ -552,6 +552,7 @@ static void __init mm_init(void) 
	pti_init();

}



void __init init_sync_kmem_pool(void);

void __init init_dma_buf_kmem_pool(void);

asmlinkage __visible void __init start_kernel(void)

{
@@ -755,6 +756,7 @@ asmlinkage __visible void __init start_kernel(void) 
	cgroup_init();

	taskstats_init_early();

	delayacct_init();

	init_sync_kmem_pool();

	init_dma_buf_kmem_pool();



	check_bugs();