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 5.4-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-5.4 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_vq.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -992,8 +992,9 @@ int virtio_gpu_object_attach(struct virt
}
/* gets freed when the ring has consumed it */
- 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-5.4/drm-virtio-use-kvmalloc-for-large-allocations.patch
