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Stefano Stabellini f62805f1f3 xen: enter/exit lazy_mmu_mode around m2p_override calls 
This patch is a significant performance improvement for the
m2p_override: about 6% using the gntdev device.

Each m2p_add/remove_override call issues a MULTI_grant_table_op and a
__flush_tlb_single if kmap_op != NULL.  Batching all the calls together
is a great performance benefit because it means issuing one hypercall
total rather than two hypercall per page.
If paravirt_lazy_mode is set PARAVIRT_LAZY_MMU, all these calls are
going to be batched together, otherwise they are issued one at a time.

Adding arch_enter_lazy_mmu_mode/arch_leave_lazy_mmu_mode around the
m2p_add/remove_override calls forces paravirt_lazy_mode to
PARAVIRT_LAZY_MMU, therefore makes sure that they are always batched.

However it is not safe to call arch_enter_lazy_mmu_mode if we are in
interrupt context or if we are already in PARAVIRT_LAZY_MMU mode, so
check for both conditions before doing so.

Changes in v4:
- rebased on 3.4-rc4: all the m2p_override users call gnttab_unmap_refs
and gnttab_map_refs;
- check whether we are in interrupt context and the lazy_mode we are in
before calling arch_enter/leave_lazy_mmu_mode.

Changes in v3:
- do not call arch_enter/leave_lazy_mmu_mode in xen_blkbk_unmap, that
can be called in interrupt context.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
[v5: s/int lazy/bool lazy/]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
 		2012-05-07 15:33:19 -04:00
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accessibility
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acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-04-06 19:56:04 -07:00
amba ARM: 7366/3: amba: Remove AMBA level regulator support 2012-04-13 14:04:08 +01:00
ata 1) AHCI regression fix. A recent "make driver conform to spec" change 2012-03-22 20:22:30 -07:00
atm Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
auxdisplay
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base drivers/base: fix compiler warning in SoC export driver - idr should be ida 2012-04-09 14:54:22 -07:00
bcma bcma: fix build error on MIPS; implicit pcibios_enable_device 2012-04-10 14:13:30 -04:00
block Merge branch 'for-3.4/drivers' of git://git.kernel.dk/linux-block 2012-04-13 18:45:13 -07:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth 2012-04-09 15:47:49 -04:00
cdrom
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char tty and serial fixes for 3.4-rc2 2012-04-12 15:36:33 -07:00
clk
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clocksource Revert "clocksource: Load the ACPI PM clocksource asynchronously" 2012-04-12 00:05:05 +02:00
connector
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cpufreq cpufreq: OMAP: fix build errors: depends on ARCH_OMAP2PLUS 2012-04-13 17:57:40 -07:00
cpuidle Merge branches 'idle-fix' and 'misc' into release 2012-04-06 21:48:59 -04:00
crypto Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-03-22 18:15:32 -07:00
dca
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devfreq ARM: global cleanups 2012-03-27 16:03:32 -07:00
dio
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dma dmaengine-fixes for 3.4-rc3 2012-04-10 15:30:16 -07:00
edac Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2012-04-06 17:56:20 -07:00
eisa
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firewire Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
firmware
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gpio gpio/exynos: Fix compiler warning in gpio-samsung.c file 2012-04-10 22:15:39 -06:00
gpu Merge branch 'exynos-drm-fixes' of git://git.infradead.org/users/kmpark/linux-samsung into drm-intel-fixes 2012-04-12 17:42:01 +01:00
hid simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
hsi
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hv
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hwmon hwmon: (pmbus_core) Fix compiler warning 2012-04-09 12:17:38 -07:00
hwspinlock
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i2c i2c: prevent spurious interrupt on Designware controllers 2012-04-10 08:09:03 -07:00
ide Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
idle simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
ieee802154
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infiniband Add a fix for a bug hit by Alexey Shvetsov in ib_srtp that hits on 2012-04-12 18:51:32 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2012-04-12 12:49:07 -07:00
iommu Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
isdn tty and serial fixes for 3.4-rc2 2012-04-12 15:36:33 -07:00
leds MFD changes for 3.4 2012-03-28 13:56:35 -07:00
lguest
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macintosh Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
mca
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md md/bitmap: prevent bitmap_daemon_work running while initialising bitmap 2012-04-12 16:05:06 +10:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-04-11 11:05:34 -07:00
memstick
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message Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
mfd ARM: 7366/3: amba: Remove AMBA level regulator support 2012-04-13 14:04:08 +01:00
misc Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
mmc mmc: use really long write timeout to deal with crappy cards 2012-04-05 20:32:34 -04:00
mtd fix breakage in mtdchar_open(), sanitize failure exits 2012-04-09 01:38:55 -04:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-04-12 14:04:33 -07:00
nfc
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nubus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
of gpio: Fix range check in of_gpio_simple_xlate() 2012-04-10 14:20:56 -06:00
oprofile simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
parisc Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
parport
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pci PCI: Fix regression in pci_restore_state(), v3 2012-04-15 13:06:29 -07:00
pcmcia Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia 2012-03-29 16:00:48 -07:00
pinctrl
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platform Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-03-30 16:45:39 -07:00
pnp Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-03-30 16:45:39 -07:00
power Various small bugfixes and enhancements, plus two new drivers: 2012-03-30 16:09:02 -07:00
pps
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ps3
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ptp
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rapidio
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regulator regulator: Fix a build warning in the anatop driver for 3.4 2012-04-10 10:26:41 -07:00
remoteproc simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
rpmsg
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rtc drivers/rtc/rtc-pl031.c: enable clock on all ST variants 2012-04-12 13:12:12 -07:00
s390 Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
sbus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
scsi SCSI: Fix error handling when no ULD is attached 2012-04-15 11:08:53 -07:00
sfi
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sh SuperH updates for 3.4 merge window 2012-03-30 00:09:17 -07:00
sn
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spi Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm 2012-04-15 17:35:19 -07:00
ssb
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staging Staging tree fixes for 3.4-rc2 2012-04-12 15:35:12 -07:00
target tcm_fc: Do not free tpg structure during wq allocation failure 2012-04-06 18:57:05 -07:00
tc
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thermal thermal: Fix for setting the thermal zone mode to enable/disable 2012-03-22 01:10:18 -04:00
tty tty and serial fixes for 3.4-rc2 2012-04-12 15:36:33 -07:00
uio
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usb xHCI: Correct the #define XHCI_LEGACY_DISABLE_SMI 2012-04-11 08:31:06 -07:00
uwb simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
vhost Merge branch 'vhost-net' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost 2012-03-23 14:46:48 -04:00
video ARM: a few more SoC fixes for 3.4-rc 2012-04-15 11:14:54 -07:00
virt
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virtio virtio-pci: switch to PM ops macro to initialise PM functions 2012-03-31 08:09:51 +05:30
vlynq
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w1
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watchdog ARM: cleanups of io includes 2012-03-29 18:02:10 -07:00
xen xen: enter/exit lazy_mmu_mode around m2p_override calls 2012-05-07 15:33:19 -04:00
zorro
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Kconfig Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00
Makefile Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00