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Commit 884688fe authored by Ram Muthiah's avatar Ram Muthiah
Browse files

ANDROID: Make vsock virtio packet buff size configurable 



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: default avatarRam Muthiah <rammuthiah@google.com>
Change-Id: Ia4f9180025b64d61d9e2b882daa84460b8f08fd2
parent ae37e863

include/linux/virtio_vsock.h

+2 −1
Original line number Diff line number Diff line
@@ -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 */

net/vmw_vsock/virtio_transport_common.c

+4 −0
Original line number Diff line number Diff line
@@ -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();