ia64/linux-2.6.18-xen.hg

view drivers/bluetooth/hci_usb.h @ 897:329ea0ccb344

balloon: try harder to balloon up under memory pressure.

Currently if the balloon driver is unable to increase the guest's
reservation it assumes the failure was due to reaching its full
allocation, gives up on the ballooning operation and records the limit
it reached as the "hard limit". The driver will not try again until
the target is set again (even to the same value).

However it is possible that ballooning has in fact failed due to
memory pressure in the host and therefore it is desirable to keep
attempting to reach the target in case memory becomes available. The
most likely scenario is that some guests are ballooning down while
others are ballooning up and therefore there is temporary memory
pressure while things stabilise. You would not expect a well behaved
toolstack to ask a domain to balloon to more than its allocation nor
would you expect it to deliberately over-commit memory by setting
balloon targets which exceed the total host memory.

This patch drops the concept of a hard limit and causes the balloon
driver to retry increasing the reservation on a timer in the same
manner as when decreasing the reservation.

Also if we partially succeed in increasing the reservation
(i.e. receive less pages than we asked for) then we may as well keep
those pages rather than returning them to Xen.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Fri Jun 05 14:01:20 2009 +0100 (2009-06-05)
parents 831230e53067
children
line source
1 /*
2 HCI USB driver for Linux Bluetooth protocol stack (BlueZ)
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6 Copyright (C) 2003 Maxim Krasnyansky <maxk@qualcomm.com>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License version 2 as
10 published by the Free Software Foundation;
12 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
13 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
15 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
16 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
17 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
22 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
23 SOFTWARE IS DISCLAIMED.
24 */
26 /* Class, SubClass, and Protocol codes that describe a Bluetooth device */
27 #define HCI_DEV_CLASS 0xe0 /* Wireless class */
28 #define HCI_DEV_SUBCLASS 0x01 /* RF subclass */
29 #define HCI_DEV_PROTOCOL 0x01 /* Bluetooth programming protocol */
31 #define HCI_IGNORE 0x01
32 #define HCI_RESET 0x02
33 #define HCI_DIGIANSWER 0x04
34 #define HCI_CSR 0x08
35 #define HCI_SNIFFER 0x10
36 #define HCI_BCM92035 0x20
37 #define HCI_BROKEN_ISOC 0x40
38 #define HCI_WRONG_SCO_MTU 0x80
40 #define HCI_MAX_IFACE_NUM 3
42 #define HCI_MAX_BULK_TX 4
43 #define HCI_MAX_BULK_RX 1
45 #define HCI_MAX_ISOC_RX 2
46 #define HCI_MAX_ISOC_TX 2
48 #define HCI_MAX_ISOC_FRAMES 10
50 struct _urb_queue {
51 struct list_head head;
52 spinlock_t lock;
53 };
55 struct _urb {
56 struct list_head list;
57 struct _urb_queue *queue;
58 int type;
59 void *priv;
60 struct urb urb;
61 };
63 static inline void _urb_free(struct _urb *_urb)
64 {
65 kfree(_urb);
66 }
68 static inline void _urb_queue_init(struct _urb_queue *q)
69 {
70 INIT_LIST_HEAD(&q->head);
71 spin_lock_init(&q->lock);
72 }
74 static inline void _urb_queue_head(struct _urb_queue *q, struct _urb *_urb)
75 {
76 unsigned long flags;
77 spin_lock_irqsave(&q->lock, flags);
78 list_add(&_urb->list, &q->head); _urb->queue = q;
79 spin_unlock_irqrestore(&q->lock, flags);
80 }
82 static inline void _urb_queue_tail(struct _urb_queue *q, struct _urb *_urb)
83 {
84 unsigned long flags;
85 spin_lock_irqsave(&q->lock, flags);
86 list_add_tail(&_urb->list, &q->head); _urb->queue = q;
87 spin_unlock_irqrestore(&q->lock, flags);
88 }
90 static inline void _urb_unlink(struct _urb *_urb)
91 {
92 struct _urb_queue *q = _urb->queue;
93 unsigned long flags;
94 if (q) {
95 spin_lock_irqsave(&q->lock, flags);
96 list_del(&_urb->list); _urb->queue = NULL;
97 spin_unlock_irqrestore(&q->lock, flags);
98 }
99 }
101 struct hci_usb {
102 struct hci_dev *hdev;
104 unsigned long state;
106 struct usb_device *udev;
108 struct usb_host_endpoint *bulk_in_ep;
109 struct usb_host_endpoint *bulk_out_ep;
110 struct usb_host_endpoint *intr_in_ep;
112 struct usb_interface *isoc_iface;
113 struct usb_host_endpoint *isoc_out_ep;
114 struct usb_host_endpoint *isoc_in_ep;
116 __u8 ctrl_req;
118 struct sk_buff_head transmit_q[4];
119 struct sk_buff *reassembly[4]; /* Reassembly buffers */
121 rwlock_t completion_lock;
123 atomic_t pending_tx[4]; /* Number of pending requests */
124 struct _urb_queue pending_q[4]; /* Pending requests */
125 struct _urb_queue completed_q[4]; /* Completed requests */
126 };
128 /* States */
129 #define HCI_USB_TX_PROCESS 1
130 #define HCI_USB_TX_WAKEUP 2