ia64/linux-2.6.18-xen.hg

view drivers/net/chelsio/sge.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 * *
3 * File: sge.h *
4 * $Revision: 1.11 $ *
5 * $Date: 2005/06/21 22:10:55 $ *
6 * Description: *
7 * part of the Chelsio 10Gb Ethernet Driver. *
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License, version 2, as *
11 * published by the Free Software Foundation. *
12 * *
13 * You should have received a copy of the GNU General Public License along *
14 * with this program; if not, write to the Free Software Foundation, Inc., *
15 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
16 * *
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED *
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF *
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. *
20 * *
21 * http://www.chelsio.com *
22 * *
23 * Copyright (c) 2003 - 2005 Chelsio Communications, Inc. *
24 * All rights reserved. *
25 * *
26 * Maintainers: maintainers@chelsio.com *
27 * *
28 * Authors: Dimitrios Michailidis <dm@chelsio.com> *
29 * Tina Yang <tainay@chelsio.com> *
30 * Felix Marti <felix@chelsio.com> *
31 * Scott Bardone <sbardone@chelsio.com> *
32 * Kurt Ottaway <kottaway@chelsio.com> *
33 * Frank DiMambro <frank@chelsio.com> *
34 * *
35 * History: *
36 * *
37 ****************************************************************************/
39 #ifndef _CXGB_SGE_H_
40 #define _CXGB_SGE_H_
42 #include <linux/types.h>
43 #include <linux/interrupt.h>
44 #include <asm/byteorder.h>
46 #ifndef IRQ_RETVAL
47 #define IRQ_RETVAL(x)
48 typedef void irqreturn_t;
49 #endif
51 typedef irqreturn_t (*intr_handler_t)(int, void *, struct pt_regs *);
53 struct sge_intr_counts {
54 unsigned int respQ_empty; /* # times respQ empty */
55 unsigned int respQ_overflow; /* # respQ overflow (fatal) */
56 unsigned int freelistQ_empty; /* # times freelist empty */
57 unsigned int pkt_too_big; /* packet too large (fatal) */
58 unsigned int pkt_mismatch;
59 unsigned int cmdQ_full[3]; /* not HW IRQ, host cmdQ[] full */
60 unsigned int cmdQ_restarted[3];/* # of times cmdQ X was restarted */
61 unsigned int ethernet_pkts; /* # of Ethernet packets received */
62 unsigned int offload_pkts; /* # of offload packets received */
63 unsigned int offload_bundles; /* # of offload pkt bundles delivered */
64 unsigned int pure_rsps; /* # of non-payload responses */
65 unsigned int unhandled_irqs; /* # of unhandled interrupts */
66 unsigned int tx_ipfrags;
67 unsigned int tx_reg_pkts;
68 unsigned int tx_lso_pkts;
69 unsigned int tx_do_cksum;
70 };
72 struct sge_port_stats {
73 unsigned long rx_cso_good; /* # of successful RX csum offloads */
74 unsigned long tx_cso; /* # of TX checksum offloads */
75 unsigned long vlan_xtract; /* # of VLAN tag extractions */
76 unsigned long vlan_insert; /* # of VLAN tag extractions */
77 unsigned long tso; /* # of TSO requests */
78 unsigned long rx_drops; /* # of packets dropped due to no mem */
79 };
81 struct sk_buff;
82 struct net_device;
83 struct adapter;
84 struct sge_params;
85 struct sge;
87 struct sge *t1_sge_create(struct adapter *, struct sge_params *);
88 int t1_sge_configure(struct sge *, struct sge_params *);
89 int t1_sge_set_coalesce_params(struct sge *, struct sge_params *);
90 void t1_sge_destroy(struct sge *);
91 intr_handler_t t1_select_intr_handler(adapter_t *adapter);
92 int t1_start_xmit(struct sk_buff *skb, struct net_device *dev);
93 void t1_set_vlan_accel(struct adapter *adapter, int on_off);
94 void t1_sge_start(struct sge *);
95 void t1_sge_stop(struct sge *);
96 int t1_sge_intr_error_handler(struct sge *);
97 void t1_sge_intr_enable(struct sge *);
98 void t1_sge_intr_disable(struct sge *);
99 void t1_sge_intr_clear(struct sge *);
100 const struct sge_intr_counts *t1_sge_get_intr_counts(struct sge *sge);
101 const struct sge_port_stats *t1_sge_get_port_stats(struct sge *sge, int port);
103 #endif /* _CXGB_SGE_H_ */