This is a note to let you know that I've just added the patch titled drm/virtio: use kvmalloc for large allocations to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-virtio-use-kvmalloc-for-large-allocations.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ea86f3defd55f141a44146e66cbf8ffb683d60da Mon Sep 17 00:00:00 2001 From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx> Date: Thu, 5 Nov 2020 10:47:44 +0900 Subject: drm/virtio: use kvmalloc for large allocations From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx> commit ea86f3defd55f141a44146e66cbf8ffb683d60da upstream. We observed that some of virtio_gpu_object_shmem_init() allocations can be rather costly - order 6 - which can be difficult to fulfill under memory pressure conditions. Switch to kvmalloc_array() in virtio_gpu_object_shmem_init() and let the kernel vmalloc the entries array. Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx> Link: http://patchwork.freedesktop.org/patch/msgid/20201105014744.1662226-1-senozhatsky@xxxxxxxxxxxx Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> Signed-off-by: Doug Horn <doughorn@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/virtio/virtgpu_object.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -172,8 +172,9 @@ static int virtio_gpu_object_shmem_init( *nents = shmem->pages->orig_nents; } - *ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry), - GFP_KERNEL); + *ents = kvmalloc_array(*nents, + sizeof(struct virtio_gpu_mem_entry), + GFP_KERNEL); if (!(*ents)) { DRM_ERROR("failed to allocate ent list\n"); return -ENOMEM; Patches currently in stable-queue which might be from senozhatsky@xxxxxxxxxxxx are queue-5.10/drm-virtio-use-kvmalloc-for-large-allocations.patch