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linux/arch/powerpc/kernel
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Michael Neuling 2fc251a8dd powerpc: Copy only required pieces of the mm_context_t to the paca 
Currently we copy the whole mm_context_t to the paca but only access a
few bits of it.  This is wasteful of space paca and also takes quite
some time in the hot path of context switching.

This patch pulls in only the required bits from the mm_context_t to
the paca and on context switch, copies only those.

Benchmarking this (On top of Anton's recent MSR context switching
changes [1]) using processes and yield shows an improvement of almost
3% on POWER8:

  http://ozlabs.org/~anton/junkcode/context_switch2.c
  ./context_switch2 --test=yield --process 0 0

1. https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-October/135700.html

Signed-off-by: Michael Neuling <mikey@neuling.org>
[mpe: Rename paca fields to be mm_ctx_foo rather than context_foo]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-27 19:12:14 +11:00
..
vdso32
powerpc: Standardise on NR_syscalls rather than __NR_syscalls.
2015-11-26 22:11:17 +11:00
vdso64
powerpc: Standardise on NR_syscalls rather than __NR_syscalls.
2015-11-26 22:11:17 +11:00
.gitignore
…
align.c
powerpc: Create disable_kernel_{fp,altivec,vsx,spe}()
2015-12-01 13:52:25 +11:00
asm-offsets.c
powerpc: Copy only required pieces of the mm_context_t to the paca
2015-12-27 19:12:14 +11:00
audit.c
…
btext.c
powerpc/btext: Fix CONFIG_PPC_EARLY_DEBUG_BOOTX on ppc32
2013-08-27 16:01:23 +10:00
cacheinfo.c
powerpc: Fix missing L2 cache size in /sys/devices/system/cpu
2015-04-11 20:49:28 +10:00
cacheinfo.h
…
compat_audit.c
…
cpu_setup_6xx.S
…
cpu_setup_44x.S
…
cpu_setup_fsl_booke.S
powerpc/booke: Restrict SPE exception handlers to e200/e500 cores
2014-09-22 10:11:31 +02:00
cpu_setup_pa6t.S
…
cpu_setup_power.S
powerpc/book3s: Fix flush_tlb cpu_spec hook to take a generic argument.
2015-03-17 07:52:48 +11:00
cpu_setup_ppc970.S
…
cputable.c
powerpc/tm: Abort syscalls in active transactions
2015-06-19 17:10:28 +10:00
crash_dump.c
powerpc: Remove superfluous bootmem includes
2014-11-10 09:59:26 +11:00
crash.c
powerpc/book3e/kdump: Enable crash_kexec_wait_realmode
2015-10-27 18:13:27 -05:00
dbell.c
powerpc/powernv: Fixes for hypervisor doorbell handling
2015-03-20 14:51:53 +11:00
dma-iommu.c
powerpc/iommu: Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask
2015-07-13 10:10:55 +10:00
dma-swiotlb.c
powerpc/iommu: Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask
2015-07-13 10:10:55 +10:00
dma.c
powerpc/dma: dma_set_coherent_mask() should not be GPL only
2015-10-28 14:20:50 +09:00
eeh_cache.c
powerpc/eeh: fix start/end/flags type in struct pci_io_addr_range{}
2015-05-13 14:00:07 +10:00
eeh_dev.c
powerpc/eeh: Create eeh_dev from pci_dn instead of device_node
2015-03-24 13:15:51 +11:00
eeh_driver.c
powerpc/eeh: Force reset on fenced PHB
2015-10-21 20:41:43 +11:00
eeh_event.c
powerpc/powernv: Fix killed EEH event
2014-06-11 17:04:33 +10:00
eeh_pe.c
powerpc/eeh: Disable automatically blocked PCI config
2015-08-18 19:34:42 +10:00
eeh_sysfs.c
powerpc/eeh: Fix PE state format
2014-11-27 09:32:58 +11:00
eeh.c
powerpc/eeh: More relaxed condition for enabled IO path
2015-10-21 20:41:43 +11:00
entry_32.S
powerpc/kernel: Change the do_syscall_trace_enter() API
2015-07-29 11:56:11 +10:00
entry_64.S
powerpc/kernel: Open code SET_DEFAULT_THREAD_PPR
2015-12-17 22:40:57 +11:00
epapr_hcalls.S
powerpc: Add paravirt idle loop for 64-bit Book-E
2013-03-13 14:19:36 -05:00
epapr_paravirt.c
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
2014-06-10 18:54:22 -07:00
exceptions-64e.S
powerpc/book3e: support CONFIG_RELOCATABLE
2015-10-27 18:13:27 -05:00
exceptions-64s.S
powerpc/kernel: Combine vec/loc for STD_EXCEPTION_PSERIES
2015-12-17 22:40:58 +11:00
fadump.c
powerpc/fadump: Fix endianess issues in firmware assisted dump handling
2014-10-30 16:52:46 +11:00
firmware.c
powerpc: fix implicit use of cache.h in kernel/firmware.c
2011-10-31 19:30:41 -04:00
fpu.S
powerpc: Remove fp_enable() and vec_enable(), use msr_check_and_{set, clear}()
2015-12-01 13:52:26 +11:00
fsl_booke_entry_mapping.S
powerpc/fsl: Force coherent memory on e500mc derivatives
2015-08-07 23:00:01 -05:00
ftrace.c
powerpc updates for 3.19
2014-12-11 17:48:14 -08:00
head_8xx.S
powerpc/8xx: Implementation of PAGE_EXEC
2015-06-02 21:37:28 -05:00
head_32.S
powerpc: Call do_page_fault() with interrupts off
2012-03-09 10:55:08 +11:00
head_40x.S
powerpc: Remove check for CONFIG_SERIAL_TEXT_DEBUG
2014-06-11 16:31:21 +10:00
head_44x.S
powerpc/ppc476: Disable BTAC
2014-08-13 15:13:42 +10:00
head_64.S
powerpc/book3e: support CONFIG_RELOCATABLE
2015-10-27 18:13:27 -05:00
head_booke.h
powerpc: Fix interrupt range check on debug exception
2013-05-02 10:31:01 +10:00
head_fsl_booke.S
powerpc: Move part of giveup_fpu,altivec,spe into c
2015-12-01 13:52:25 +11:00
hw_breakpoint.c
powerpc: Replace __get_cpu_var uses
2014-11-03 12:12:32 +11:00
ibmebus.c
powerpc: make of_device_ids const
2014-09-25 23:14:46 +10:00
idle_6xx.S
powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly
2012-07-11 14:18:22 +10:00
idle_book3e.S
powerpc: No need to use dot symbols when branching to a function
2014-04-23 10:05:16 +10:00
idle_e500.S
powerpc/e500mc: Remove dead L2 flushing code in idle_e500.S
2015-06-02 21:37:19 -05:00
idle_power4.S
powerpc: No need to use dot symbols when branching to a function
2014-04-23 10:05:16 +10:00
idle_power7.S
powerpc: Remove UP only lazy floating point and vector optimisations
2015-12-01 13:52:24 +11:00
idle.c
powerpc/idle: Convert use of typedef ctl_table to struct ctl_table
2013-07-01 11:10:35 +10:00
io-workarounds.c
powerpc/mm: Differentiate between hugetlb and THP during page walk
2015-10-12 15:30:09 +11:00
io.c
powerpc/powernv: Add PIO accessors for Power8 LPC bus
2013-08-14 14:58:08 +10:00
iomap.c
powerpc/kerenl: Enable EEH for IO accessors
2014-06-24 12:43:13 +10:00
iommu.c
powerpc/iommu/powernv: Release replaced TCE
2015-06-11 15:16:49 +10:00
irq.c
powerpc, irq: Use access helper irq_data_get_affinity_mask()
2015-09-15 17:06:28 +02:00
isa-bridge.c
POWERPC: drivers: remove __dev* attributes.
2013-01-03 15:57:04 -08:00
jump_label.c
jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP}
2015-08-03 11:34:12 +02:00
kgdb.c
powerpc: Replace __get_cpu_var uses
2014-11-03 12:12:32 +11:00
kprobes.c
powerpc: Replace __get_cpu_var uses
2014-11-03 12:12:32 +11:00
kvm_emul.S
KVM: PPC: Not optimizing MSR_CE and MSR_ME with paravirt.
2012-05-30 11:43:11 +02:00
kvm.c
powerpc: Remove redundant breaks
2015-08-06 15:10:20 +10:00
l2cr_6xx.S
…
legacy_serial.c
powerpc: make of_device_ids const
2014-09-25 23:14:46 +10:00
machine_kexec_32.c
treewide: convert uses of ATTRIB_NORETURN to __noreturn
2012-01-12 20:13:03 -08:00
machine_kexec_64.c
powerpc/book3e-64: Enable kexec
2015-10-27 18:13:30 -05:00
machine_kexec.c
powerpc: Fix endian issues in kexec and crash dump code
2014-02-11 11:24:52 +11:00
Makefile
powerpc/ftrace: add powerpc timebase as a trace clock source
2015-08-06 16:36:23 +10:00
mce_power.c
powerpc/book3s: Fix flush_tlb cpu_spec hook to take a generic argument.
2015-03-17 07:52:48 +11:00
mce.c
powerpc/mce: fix off by one errors in mce event handling
2015-05-12 19:44:01 +10:00
misc_32.S
powerpc/476fpe: Add support for kexec
2015-12-17 22:41:00 +11:00
misc_64.S
powerpc/book3e-64: Enable kexec
2015-10-27 18:13:30 -05:00
misc.S
powerpc: Rename __get_SP() to current_stack_pointer()
2014-10-15 11:23:20 +11:00
module_32.c
powerpc: Use pr_fmt in module loader code
2014-10-02 17:33:54 +10:00
module_64.c
powerpc: Use pr_fmt in module loader code
2014-10-02 17:33:54 +10:00
module.c
powerpc: Move local setup.h declarations to arch includes
2013-10-30 16:00:31 +11:00
msi.c
powerpc: Remove MSI-related PCI controller ops from ppc_md
2015-06-02 11:47:45 +10:00
nvram_64.c
powerpc/nvram: Fix function name in some errors messages.
2015-10-02 22:55:05 +10:00
of_platform.c
powerpc/eeh: Do probe on pci_dn
2015-03-24 13:15:52 +11:00
paca.c
powerpc/book3e-64: Don't limit paca to 256 MiB
2015-10-27 18:13:28 -05:00
pci_32.c
powerpc: Remove more traces of bootmem
2014-11-19 21:41:51 +11:00
pci_64.c
powerpc updates for 3.19
2014-12-11 17:48:14 -08:00
pci_dn.c
powerpc/powernv: Shift VF resource with an offset
2015-03-31 13:02:38 +11:00
pci_of_scan.c
libnvdimm for 4.3:
2015-09-08 14:35:59 -07:00
pci-common.c
powerpc/pci: export pcibios_free_controller()
2015-10-15 20:31:57 +11:00
pci-hotplug.c
powerpc/pci: Add release_device() hook to phb ops
2015-06-03 13:27:15 +10:00
pmc.c
bug.h: add include of it to various implicit C users
2012-02-29 17:15:08 -05:00
ppc32.h
powerpc: switch to generic old sigaction()
2013-02-03 18:16:10 -05:00
ppc_ksyms_32.c
powerpc: Separate ppc32 symbol exports into ppc_ksyms_32.c
2014-09-25 23:14:40 +10:00
ppc_ksyms.c
powerpc: Move part of giveup_fpu,altivec,spe into c
2015-12-01 13:52:25 +11:00
ppc_save_regs.S
…
proc_powerpc.c
proc_powerpc: switch to fixed_size_llseek()
2013-06-29 12:57:50 +04:00
process.c
powerpc fixes for 4.4 #2
2015-12-14 20:40:32 +11:00
prom_init_check.sh
powerpc: Simplify symbol check in prom_init_check.sh
2014-09-25 23:14:46 +10:00
prom_init.c
powerpc: Add missing calls to va_end()
2015-12-17 23:23:22 +11:00
prom_parse.c
powerpc: of_parse_dma_window should take a __be32 *dma_window
2013-08-14 15:33:26 +10:00
prom.c
powerpc/prom: Use of_get_next_parent() in of_get_ibm_chip_id()
2015-10-28 12:08:32 +09:00
ptrace32.c
powerpc: move debug registers in a structure
2013-10-18 18:44:49 -05:00
ptrace.c
powerpc: Add rN aliases to the pt_regs_offset table.
2015-11-26 22:11:17 +11:00
reloc_32.S
powerpc: Don't flush/invalidate the d/icache for an unknown relocation type
2013-07-01 11:10:34 +10:00
reloc_64.S
powerpc: Align p_dyn, p_rela and p_st symbols
2014-03-07 13:50:19 +11:00
rtas_flash.c
powerpc: Fix endianness of flash_block_list in rtas_flash
2014-07-28 11:30:54 +10:00
rtas_pci.c
powerpc: move find_and_init_phbs() to pSeries specific code
2015-04-11 20:49:09 +10:00
rtas-proc.c
powerpc: LLVM complains about forward declaration of struct rtas_sensors
2014-11-10 09:59:32 +11:00
rtas-rtc.c
…
rtas.c
powerpc/rtas: Make enter_rtas() private
2015-12-17 22:40:56 +11:00
rtasd.c
powerpc: Make a bunch of things static
2014-09-25 23:14:41 +10:00
setup_32.c
powerpc32: memset: only use dcbz once cache is enabled
2015-09-17 10:36:53 +10:00
setup_64.c
powerpc/book3e-64/kexec: Enable SMP release
2015-10-27 18:13:29 -05:00
setup-common.c
powerpc: Convert power off logic to pm_power_off
2014-11-03 12:12:51 +11:00
signal_32.c
powerpc fixes for 4.4 #2
2015-12-14 20:40:32 +11:00
signal_64.c
powerpc fixes for 4.4 #2
2015-12-14 20:40:32 +11:00
signal.c
powerpc: Use sigsp()
2014-08-06 13:04:32 +02:00
signal.h
powerpc: Use get_signal() signal_setup_done()
2014-08-06 13:03:09 +02:00
smp-tbsync.c
powerpc: Delete non-required instances of include <linux/init.h>
2014-01-15 13:46:44 +11:00
smp.c
powerpc/smp: Wait until secondaries are active & online
2015-03-04 13:19:33 +11:00
stacktrace.c
powerpc: Rename __get_SP() to current_stack_pointer()
2014-10-15 11:23:20 +11:00
suspend.c
nosave: consolidate __nosave_{begin,end} in <asm/sections.h>
2014-10-09 22:26:04 -04:00
swsusp_32.S
…
swsusp_64.c
Disintegrate asm/system.h for PowerPC
2012-03-28 18:30:02 +01:00
swsusp_asm64.S
powerpc: Only save/restore SDR1 if in hypervisor mode
2013-10-31 12:37:29 +11:00
swsusp_booke.S
powerpc/fsl-booke: Use SPRN_SPRGn rather than mfsprg/mtsprg
2014-01-07 19:06:03 -06:00
swsusp.c
powerpc: create flush_all_to_thread()
2015-12-02 19:34:40 +11:00
sys_ppc32.c
unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE
2013-05-09 13:46:38 -04:00
syscalls.c
powerpc: Add a proper syscall for switching endianness
2015-03-28 22:03:40 +11:00
sysfs.c
powerpc/dscr: Add some in-code documentation
2015-06-07 19:29:15 +10:00
systbl_chk.c
powerpc: Standardise on NR_syscalls rather than __NR_syscalls.
2015-11-26 22:11:17 +11:00
systbl_chk.sh
powerpc: Standardise on NR_syscalls rather than __NR_syscalls.
2015-11-26 22:11:17 +11:00
systbl.S
powerpc: Add a proper syscall for switching endianness
2015-03-28 22:03:40 +11:00
tau_6xx.c
…
time.c
powerpc: Remove broken GregorianDay()
2015-12-16 12:54:04 +11:00
tm.S
powerpc/kernel: Rename PACA_DSCR to PACA_DSCR_DEFAULT
2015-06-07 19:29:00 +10:00
trace_clock.c
powerpc/ftrace: add powerpc timebase as a trace clock source
2015-08-06 16:36:23 +10:00
traps.c
powerpc: Remove unused function trace_syscall()
2015-11-26 22:11:16 +11:00
udbg_16550.c
powerpc: Fix bad NULL pointer check in udbg_uart_getc_poll()
2014-11-12 13:47:20 +11:00
udbg.c
powerpc: Remove the celleb support
2015-04-07 17:15:13 +10:00
uprobes.c
uprobes/powerpc: Kill arch_uprobe->ainsn
2013-11-20 16:31:01 +01:00
vdso.c
powerpc: Standardise on NR_syscalls rather than __NR_syscalls.
2015-11-26 22:11:17 +11:00
vecemu.c
powerpc: Put FP/VSX and VR state into structures
2013-10-11 17:26:49 +11:00
vector.S
powerpc: Remove fp_enable() and vec_enable(), use msr_check_and_{set, clear}()
2015-12-01 13:52:26 +11:00
vio.c
powerpc: use for_each_sg()
2015-06-24 17:49:38 -07:00
vmlinux.lds.S
powerpc: discard .exit.data at runtime
2015-10-15 20:31:59 +11:00