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techpack: camera: use kmem_cache pool for struct sync_user_payload

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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: Park Ju Hyung <qkrwngud825@gmail.com>
[@0ctobot: Adapted for 4.19]
Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>
This commit is contained in:
Park Ju Hyung 2021-03-13 10:35:12 -05:00 committed by spakkkk
parent 4c374f8565
commit 737ee0e2bf
1 changed files with 10 additions and 5 deletions
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15
techpack/camera/drivers/cam_sync/cam_sync.c
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@ -17,6 +17,7 @@
#include <synx_api.h>
#endif
struct sync_device *sync_dev;
static struct kmem_cache *kmem_payload_pool;
/*
* Flag to determine whether to enqueue cb of a
@ -598,7 +599,7 @@ static int cam_sync_handle_register_user_payload(
if (sync_obj >= CAM_SYNC_MAX_OBJS || sync_obj <= 0)
return -EINVAL;
user_payload_kernel = kzalloc(sizeof(*user_payload_kernel), GFP_KERNEL);
user_payload_kernel = kmem_cache_zalloc(kmem_payload_pool, GFP_KERNEL);
if (!user_payload_kernel)
return -ENOMEM;
@ -614,7 +615,7 @@ static int cam_sync_handle_register_user_payload(
"Error: accessing an uninitialized sync obj = %d",
sync_obj);
spin_unlock_bh(&sync_dev->row_spinlocks[sync_obj]);
kfree(user_payload_kernel);
kmem_cache_free(kmem_payload_pool, user_payload_kernel);
return -EINVAL;
}
@ -628,7 +629,7 @@ static int cam_sync_handle_register_user_payload(
CAM_SYNC_USER_PAYLOAD_SIZE * sizeof(__u64));
spin_unlock_bh(&sync_dev->row_spinlocks[sync_obj]);
kfree(user_payload_kernel);
kmem_cache_free(kmem_payload_pool, user_payload_kernel);
return 0;
}
@ -642,7 +643,7 @@ static int cam_sync_handle_register_user_payload(
user_payload_kernel->payload_data[1]) {
spin_unlock_bh(&sync_dev->row_spinlocks[sync_obj]);
kfree(user_payload_kernel);
kmem_cache_free(kmem_payload_pool, user_payload_kernel);
return -EALREADY;
}
}
@ -697,7 +698,7 @@ static int cam_sync_handle_deregister_user_payload(
user_payload_kernel->payload_data[1] ==
userpayload_info.payload[1]) {
list_del_init(&user_payload_kernel->list);
kfree(user_payload_kernel);
kmem_cache_free(kmem_payload_pool, user_payload_kernel);
}
}
@ -1132,6 +1133,8 @@ static int __init cam_sync_init(void)
{
int rc;
kmem_payload_pool = KMEM_CACHE(sync_user_payload, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
rc = platform_device_register(&cam_sync_device);
if (rc)
return -ENODEV;
@ -1148,6 +1151,8 @@ static void __exit cam_sync_exit(void)
platform_driver_unregister(&cam_sync_driver);
platform_device_unregister(&cam_sync_device);
kfree(sync_dev);
kmem_cache_destroy(kmem_payload_pool);
}
module_init(cam_sync_init);