ia64/linux-2.6.18-xen.hg

view drivers/atm/Makefile @ 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 # Makefile for the Linux network (ATM) device drivers.
3 #
5 fore_200e-objs := fore200e.o
6 hostprogs-y := fore200e_mkfirm
8 # Files generated that shall be removed upon make clean
9 clean-files := atmsar11.bin atmsar11.bin1 atmsar11.bin2 pca200e.bin \
10 pca200e.bin1 pca200e.bin2 pca200e_ecd.bin pca200e_ecd.bin1 \
11 pca200e_ecd.bin2 sba200e_ecd.bin sba200e_ecd.bin1 sba200e_ecd.bin2
12 # Firmware generated that shall be removed upon make clean
13 clean-files += fore200e_pca_fw.c fore200e_sba_fw.c
15 obj-$(CONFIG_ATM_ZATM) += zatm.o uPD98402.o
16 obj-$(CONFIG_ATM_NICSTAR) += nicstar.o
17 obj-$(CONFIG_ATM_AMBASSADOR) += ambassador.o
18 obj-$(CONFIG_ATM_HORIZON) += horizon.o
19 obj-$(CONFIG_ATM_IA) += iphase.o suni.o
20 obj-$(CONFIG_ATM_FORE200E) += fore_200e.o
21 obj-$(CONFIG_ATM_ENI) += eni.o suni.o
22 obj-$(CONFIG_ATM_IDT77252) += idt77252.o
24 ifeq ($(CONFIG_ATM_NICSTAR_USE_SUNI),y)
25 obj-$(CONFIG_ATM_NICSTAR) += suni.o
26 endif
27 ifeq ($(CONFIG_ATM_NICSTAR_USE_IDT77105),y)
28 obj-$(CONFIG_ATM_NICSTAR) += idt77105.o
29 endif
30 ifeq ($(CONFIG_ATM_IDT77252_USE_SUNI),y)
31 obj-$(CONFIG_ATM_IDT77252) += suni.o
32 endif
34 obj-$(CONFIG_ATM_DUMMY) += adummy.o
35 obj-$(CONFIG_ATM_TCP) += atmtcp.o
36 obj-$(CONFIG_ATM_FIRESTREAM) += firestream.o
37 obj-$(CONFIG_ATM_LANAI) += lanai.o
39 ifeq ($(CONFIG_ATM_FORE200E_PCA),y)
40 fore_200e-objs += fore200e_pca_fw.o
41 # guess the target endianess to choose the right PCA-200E firmware image
42 ifeq ($(CONFIG_ATM_FORE200E_PCA_DEFAULT_FW),y)
43 byteorder.h := include$(if $(patsubst $(srctree),,$(objtree)),2)/asm/byteorder.h
44 CONFIG_ATM_FORE200E_PCA_FW := $(obj)/pca200e$(if $(shell $(CC) -E -dM $(byteorder.h) | grep ' __LITTLE_ENDIAN '),.bin,_ecd.bin2)
45 endif
46 endif
48 ifeq ($(CONFIG_ATM_FORE200E_SBA),y)
49 fore_200e-objs += fore200e_sba_fw.o
50 ifeq ($(CONFIG_ATM_FORE200E_SBA_DEFAULT_FW),y)
51 CONFIG_ATM_FORE200E_SBA_FW := $(obj)/sba200e_ecd.bin2
52 endif
53 endif
54 obj-$(CONFIG_ATM_HE) += he.o
55 ifeq ($(CONFIG_ATM_HE_USE_SUNI),y)
56 obj-$(CONFIG_ATM_HE) += suni.o
57 endif
59 # FORE Systems 200E-series firmware magic
60 $(obj)/fore200e_pca_fw.c: $(patsubst "%", %, $(CONFIG_ATM_FORE200E_PCA_FW)) \
61 $(obj)/fore200e_mkfirm
62 $(obj)/fore200e_mkfirm -k -b _fore200e_pca_fw \
63 -i $(CONFIG_ATM_FORE200E_PCA_FW) -o $@
65 $(obj)/fore200e_sba_fw.c: $(patsubst "%", %, $(CONFIG_ATM_FORE200E_SBA_FW)) \
66 $(obj)/fore200e_mkfirm
67 $(obj)/fore200e_mkfirm -k -b _fore200e_sba_fw \
68 -i $(CONFIG_ATM_FORE200E_SBA_FW) -o $@
70 # deal with the various suffixes of the binary firmware images
71 $(obj)/%.bin $(obj)/%.bin1 $(obj)/%.bin2: $(src)/%.data
72 objcopy -Iihex $< -Obinary $@.gz
73 gzip -n -df $@.gz