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linux/arch/powerpc/platforms
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Michael Neuling d504bed676 powerpc/kexec: Speedup kexec hash PTE tear down 
Currently for kexec the PTE tear down on 1TB segment systems normally
requires 3 hcalls for each PTE removal. On a machine with 32GB of
memory it can take around a minute to remove all the PTEs.

This optimises the path so that we only remove PTEs that are valid.
It also uses the read 4 PTEs at once HCALL.  For the common case where
a PTEs is invalid in a 1TB segment, this turns the 3 HCALLs per PTE
down to 1 HCALL per 4 PTEs.

This gives an > 10x speedup in kexec times on PHYP, taking a 32GB
machine from around 1 minute down to a few seconds.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2010-05-21 17:31:11 +10:00
..
8xx include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
40x
44x powerpc/4xx: Simple platform for the ISS 4xx simulator 2010-05-05 11:11:56 -04:00
52xx Merge branch 'master' into export-slabh 2010-04-05 11:37:28 +09:00
82xx include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
83xx powerpc/83xx: Add MCU LEDs support for MPC837xRDB and MPC8315RDB boards 2010-05-17 10:55:32 -05:00
85xx powerpc/85xx/86xx: Fix build w/ CONFIG_PCI=n 2010-04-19 23:12:21 -05:00
86xx powerpc/8610: add probing for individual DMA channels, not just DMA controllers 2010-05-17 10:55:33 -05:00
512x Merge commit 'gcl/next' into next 2010-02-19 14:38:23 +11:00
amigaone
cell powerpc/cpumask: Dynamically allocate cpu_sibling_map and cpu_core_map cpumasks 2010-05-06 17:41:56 +10:00
chrp include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
embedded6xx powerpc/gc/wii: Remove get_irq_desc() 2009-12-21 11:12:14 +11:00
iseries powerpc: Avoid bad relocations in iSeries code 2010-05-21 17:31:08 +10:00
maple include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
pasemi powerpc/cpumask: Use cpu_online_mask 2010-05-06 17:16:12 +10:00
powermac powerpc: Use common cpu_die (fixes SMP+SUSPEND build) 2010-05-21 17:31:08 +10:00
prep
ps3 include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
pseries powerpc/kexec: Speedup kexec hash PTE tear down 2010-05-21 17:31:11 +10:00
fsl_uli1575.c PCI: add pci_bus_for_each_resource(), remove direct bus->resource[] refs 2010-02-23 09:43:31 -08:00
Kconfig
Kconfig.cputype powerpc/47x: Base ppc476 support 2010-05-05 09:11:10 -04:00
Makefile