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ANDROID: Make vsock virtio packet buff size configurable

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When the android virtual device stays up for long periods of time, the
SLAB sustains everincreasing fragmentation. Contributing to this
fragmentation are the virtio packet buffer allocations which are a
drain on 64Kb compound pages. Eventually these can't be allocated due to
fragmentation.

To enable successful allocations for this packet buffer, the packet
buffer's size needs to be reduced.

To enable a reduction without impacting other partners, this var is
being exposed as a command line param.

Bug: 149494272
Test: atest ManagedProfileLifecycleStressTest#testCreateStartDelete on
local cuttlefish device
Signed-off-by: Ram Muthiah <rammuthiah@google.com>
Change-Id: Ia4f9180025b64d61d9e2b882daa84460b8f08fd2
This commit is contained in:
Ram Muthiah 2021-01-26 20:27:32 -08:00
parent ae37e86392
commit 884688fe0c
2 changed files with 6 additions and 1 deletions
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3
include/linux/virtio_vsock.h
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@ -12,7 +12,8 @@
#define VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE (1024 * 256)
#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4)
#define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL
#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64)
#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE virtio_transport_max_vsock_pkt_buf_size
extern uint virtio_transport_max_vsock_pkt_buf_size;
enum {
VSOCK_VQ_RX = 0, /* for host to guest data */

4
net/vmw_vsock/virtio_transport_common.c
View File

@ -29,6 +29,10 @@
/* Threshold for detecting small packets to copy */
#define GOOD_COPY_LEN 128
uint virtio_transport_max_vsock_pkt_buf_size = 64 * 1024;
module_param(virtio_transport_max_vsock_pkt_buf_size, uint, 0444);
EXPORT_SYMBOL_GPL(virtio_transport_max_vsock_pkt_buf_size);
static const struct virtio_transport *virtio_transport_get_ops(void)
{
const struct vsock_transport *t = vsock_core_get_transport();