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I just realized this has a kmap_atomic bug in...
The below would fix it - but it's complicating this code
some more.
Alternatively I would have to introduce something like
pte_offset_map_irq() which would make the irq/nmi detection and leave
the regular code paths alone, however that would mean either duplicating
the gup_fast() pagewalk or passing down a pte function pointer, which
would only duplicate the gup_pte_range() bit, neither is really
attractive ...
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Nick Piggin <npiggin@suse.de>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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At present, every architecture that supports perf_counters has to
declare set_perf_counter_pending() in its arch-specific headers.
This consolidates the declarations into a single declaration in one
common place, include/linux/perf_counter.h. On powerpc, we continue
to provide a static inline definition of set_perf_counter_pending()
in the powerpc hw_irq.h.
Also, this removes from the x86 perf_counter.h the unused null
definitions of {test,clear}_perf_counter_pending.
Reported-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: benh@kernel.crashing.org
LKML-Reference: <18998.13388.920691.523227@cargo.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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This fixes a couple of compile warnings that crept into the powerpc
perf_counter code recently:
CC arch/powerpc/kernel/perf_counter.o
arch/powerpc/kernel/perf_counter.c: In function 'record_and_restart':
arch/powerpc/kernel/perf_counter.c:1016: warning: unused variable 'addr'
arch/powerpc/kernel/perf_counter.c: In function 'hw_perf_counter_init':
arch/powerpc/kernel/perf_counter.c:891: warning: 'ev' may be used uninitialized in this function
Stephen Rothwell reported this against linux-next as well.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <18998.12884.787039.22202@cargo.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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__copy_from_user_inatomic() isn't NMI safe in that it can trigger
the page fault handler which is another trap and its return path
invokes IRET which will also close the NMI context.
Therefore use a GUP based approach to copy the stack frames over.
We tried an alternative solution as well: we used a forward ported
version of Mathieu Desnoyers's "NMI safe INT3 and Page Fault" patch
that modifies the exception return path to use an open-coded IRET with
explicit stack unrolling and TF checking.
This didnt work as it interacted with faulting user-space instructions,
causing them not to restart properly, which corrupts user-space
registers.
Solving that would probably involve disassembling those instructions
and backtracing the RIP. But even without that, the code was deemed
rather complex to the already non-trivial x86 entry assembly code,
so instead we went for this GUP based method that does a
software-walk of the pagetables.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Two new kmap_atomic slots for NMI context. And teach pte_offset_map()
about NMI context.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Nick Piggin <npiggin@suse.de>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Introduce a gup_fast() variant which is usable from IRQ/NMI context.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Nick Piggin <npiggin@suse.de>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Kernel-space call-chains were trimmed at the first entry because
we never processed anything beyond the first stack context.
Allow the backtrace to jump from NMI to IRQ stack then to task stack
and finally user-space stack.
Also calculate the stack and bp variables correctly so that the
stack walker does not exit early.
We can get deep traces as a result, visible in perf report -D output:
0x32af0 [0xe0]: PERF_EVENT (IP, 5): 15134: 0xffffffff815225fd period: 1
... chain: u:2, k:22, nr:24
..... 0: 0xffffffff815225fd
..... 1: 0xffffffff810ac51c
..... 2: 0xffffffff81018e29
..... 3: 0xffffffff81523939
..... 4: 0xffffffff81524b8f
..... 5: 0xffffffff81524bd9
..... 6: 0xffffffff8105e498
..... 7: 0xffffffff8152315a
..... 8: 0xffffffff81522c3a
..... 9: 0xffffffff810d9b74
..... 10: 0xffffffff810dbeec
..... 11: 0xffffffff810dc3fb
This is a 22-entries kernel-space chain.
(We still only record reliable stack entries.)
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Fix the ptregs variant when we hit user-mode tasks.
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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All AMD models share the same hw caching related event table.
Also complete the table with more events.
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1244835381.2802.2.camel@ht.satnam>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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AMD supports performance monitoring start from K7 (i.e. family 6),
so disable it for earlier AMD CPUs.
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1244714289.6923.0.camel@ht.satnam>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: (30 commits)
[S390] wire up sys_perf_counter_open
[S390] wire up sys_rt_tgsigqueueinfo
[S390] ftrace: add system call tracer support
[S390] ftrace: add function graph tracer support
[S390] ftrace: add function trace mcount test support
[S390] ftrace: add dynamic ftrace support
[S390] kprobes: use probe_kernel_write
[S390] maccess: arch specific probe_kernel_write() implementation
[S390] maccess: add weak attribute to probe_kernel_write
[S390] profile_tick called twice
[S390] dasd: forward internal errors to dasd_sleep_on caller
[S390] dasd: sync after async probe
[S390] dasd: check_characteristics cleanup
[S390] dasd: no High Performance FICON in 31-bit mode
[S390] dcssblk: revert devt conversion
[S390] qdio: fix access beyond ARRAY_SIZE of irq_ptr->{in,out}put_qs
[S390] vmalloc: add vmalloc kernel parameter support
[S390] uaccess: use might_fault() instead of might_sleep()
[S390] 3270: lock dependency fixes
[S390] 3270: do not register with tty_register_device
...
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git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
add generic lib/checksum.c
asm-generic: add a generic uaccess.h
asm-generic: add generic NOMMU versions of some headers
asm-generic: add generic atomic.h and io.h
asm-generic: add legacy I/O header files
asm-generic: add generic versions of common headers
asm-generic: make bitops.h usable
asm-generic: make pci.h usable directly
asm-generic: make get_rtc_time overridable
asm-generic: rename page.h and uaccess.h
asm-generic: rename atomic.h to atomic-long.h
asm-generic: add a generic unistd.h
asm-generic: add generic ABI headers
asm-generic: add generic sysv ipc headers
asm-generic: introduce asm/bitsperlong.h
asm-generic: rename termios.h, signal.h and mman.h
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6:
PM: Add empty suspend/resume device irq functions
PM/Hibernate: Move NVS routines into a seperate file (v2).
PM/Hibernate: Rename disk.c to hibernate.c
PM: Separate suspend to RAM functionality from core
Driver Core: Rework platform suspend/resume, print warning
PM: Remove device_type suspend()/resume()
PM/Hibernate: Move memory shrinking to snapshot.c (rev. 2)
PM/Suspend: Do not shrink memory before suspend
PM: Remove bus_type suspend_late()/resume_early() V2
PM core: rename suspend and resume functions
PM: Rename device_power_down/up()
PM: Remove unused asm/suspend.h
x86: unify power/cpu_(32|64).c
x86: unify power/cpu_(32|64) copyright notes
x86: unify power/cpu_(32|64) regarding restoring processor state
x86: unify power/cpu_(32|64) regarding saving processor state
x86: unify power/cpu_(32|64) global variables
x86: unify power/cpu_(32|64) headers
PM: Warn if interrupts are enabled during suspend-resume of sysdevs
PM/ACPI/x86: Fix sparse warning in arch/x86/kernel/acpi/sleep.c
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
perf_counter: Start documenting HAVE_PERF_COUNTERS requirements
perf_counter: Add forward/backward attribute ABI compatibility
perf record: Explicity program a default counter
perf_counter: Remove PERF_TYPE_RAW special casing
perf_counter: PERF_TYPE_HW_CACHE is a hardware counter too
powerpc, perf_counter: Fix performance counter event types
perf_counter/x86: Add a quirk for Atom processors
perf_counter tools: Remove one L1-data alias
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* 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze: (55 commits)
microblaze: Don't use access_ok for unaligned
microblaze: remove unused flat_stack_align() definition
microblaze: Fix problem with early_printk in startup
microblaze_mmu_v2: Makefiles
microblaze_mmu_v2: Kconfig update
microblaze_mmu_v2: stat.h MMU update
microblaze_mmu_v2: Elf update
microblaze_mmu_v2: Update dma.h for MMU
microblaze_mmu_v2: Update cacheflush.h
microblaze_mmu_v2: Update signal returning address
microblaze_mmu_v2: Traps MMU update
microblaze_mmu_v2: Enable fork syscall for MMU and add fork as vfork for noMMU
microblaze_mmu_v2: Update linker script for MMU
microblaze_mmu_v2: Add MMU related exceptions handling
microblaze_mmu_v2: uaccess MMU update
microblaze_mmu_v2: Update exception handling - MMU exception
microblaze_mmu_v2: entry.S, entry.h
microblaze_mmu_v2: Add CURRENT_TASK for entry.S
microblaze_mmu_v2: MMU asm offset update
microblaze_mmu_v2: Update tlb.h and tlbflush.h
...
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git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin: (62 commits)
Blackfin: fix sparseirq/kstat_irqs fallout
Blackfin: fix unused warnings after nommu update
Blackfin: export the last exception cause via debugfs
Blackfin: fix length checking in kgdb_ebin2mem
Blackfin: kgdb: fix up error return values
Blackfin: push access_ok() L1 attribute down
Blackfin: punt duplicated search_exception_table() prototype
Blackfin: add missing access_ok() checks to user functions
Blackfin: convert early_printk EVT init to a loop
Blackfin: document the lsl variants of the L1 allocator
Blackfin: rename Blackfin relocs according to the toolchain
Blackfin: check SIC defines rather than variant names
Blackfin: add SSYNC to set_dma_sg() for descriptor fetching
Blackfin: convert SMP to only use generic time framework
Blackfin: bf548-ezkit/bf537-stamp: add resources for ADXL345/346
Blackfin: override default uClinux MTD addr/size
Blackfin: fix command line corruption with DEBUG_DOUBLEFAULT
Blackfin: fix handling of initial L1 reservation
Blackfin: merge sram init functions
Blackfin: drop unused reserve_pda() function
...
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This patch (as1241) renames a bunch of functions in the PM core.
Rather than go through a boring list of name changes, suffice it to
say that in the end we have a bunch of pairs of functions:
device_resume_noirq dpm_resume_noirq
device_resume dpm_resume
device_complete dpm_complete
device_suspend_noirq dpm_suspend_noirq
device_suspend dpm_suspend
device_prepare dpm_prepare
in which device_X does the X operation on a single device and dpm_X
invokes device_X for all devices in the dpm_list.
In addition, the old dpm_power_up and device_resume_noirq have been
combined into a single function (dpm_resume_noirq).
Lastly, dpm_suspend_start and dpm_resume_end are the renamed versions
of the former top-level device_suspend and device_resume routines.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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Rename the functions performing "_noirq" dev_pm_ops
operations from device_power_down() and device_power_up()
to device_suspend_noirq() and device_resume_noirq().
The new function names are chosen to show that the functions
are responsible for calling the _noirq() versions to finalize
the suspend/resume operation. The current function names do
not perform power down/up anymore so the names may be misleading.
Global function renames:
- device_power_down() -> device_suspend_noirq()
- device_power_up() -> device_resume_noirq()
Static function renames:
- suspend_device_noirq() -> __device_suspend_noirq()
- resume_device_noirq() -> __device_resume_noirq()
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Len Brown <lenb@kernel.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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This patch removes unused asm/suspend.h files for
the following architectures:
alpha, arm, ia64, m68k, mips, s390, um
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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This is the last unification step. Here we do remove one of the files
and rename the left one as cpu.c, as both are now the same.
Also update power/Makefile, telling it to build cpu.o, instead of
cpu_(32|64).o
Signed-off-by: Sergio Luis <sergio@larces.uece.br>
Signed-off-by: Lauro Salmito <laurosalmito@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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In this step, we do unify the copyright notes for both files
cpu_32.c and cpu_64.c, making such files exactly the same.
It's the last step before the actual unification, that will
rename one of them to cpu.c and remove the other one.
Signed-off-by: Sergio Luis <sergio@larces.uece.br>
Signed-off-by: Lauro Salmito <laurosalmito@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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In this step we do unify cpu_32.c and cpu_64.c functions that
work on restoring the saved processor state. Also, we do
eliminate the forward declaration of fix_processor_context()
for X86_64, as it's not needed anymore.
Signed-off-by: Sergio Luis <sergio@larces.uece.br>
Signed-off-by: Lauro Salmito <laurosalmito@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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In this step we do unify cpu_32.c and cpu_64.c functions that
work on saving the processor state.
Signed-off-by: Sergio Luis <sergio@larces.uece.br>
Signed-off-by: Lauro Salmito <laurosalmito@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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Aiming total unification of cpu_32.c and cpu_64.c, in this step
we do unify the global variables and existing forward declarations
for such files.
Signed-off-by: Sergio Luis <sergio@larces.uece.br>
Signed-off-by: Lauro Salmito <laurosalmito@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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First step towards the unification of cpu_32.c and cpu_64.c.
This commit unifies the headers of such files, making both
of them use the same header files. It also remove the uneeded
<module.h>.
Signed-off-by: Sergio Luis <sergio@larces.uece.br>
Signed-off-by: Lauro Salmito <laurosalmito@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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One of the numbers in arch/x86/kernel/acpi/sleep.c is long, but it is
not annotated appropriately, so sparese warns about it. Fix that.
[rjw: added the changelog.]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: (290 commits)
ALSA: pcm - Update document about xrun_debug proc file
ALSA: lx6464es - support standard alsa module parameters
ALSA: snd_usb_caiaq: set mixername
ALSA: hda - add quirk for STAC92xx (SigmaTel STAC9205)
ALSA: use card device as parent for jack input-devices
ALSA: sound/ps3: Correct existing and add missing annotations
ALSA: sound/ps3: Restructure driver source
ALSA: sound/ps3: Fix checkpatch issues
ASoC: Fix lm4857 control
ALSA: ctxfi - Clear PCM resources at hw_params and hw_free
ALSA: ctxfi - Check the presence of SRC instance in PCM pointer callbacks
ALSA: ctxfi - Add missing start check in atc_pcm_playback_start()
ALSA: ctxfi - Add use_system_timer module option
ALSA: usb - Add boot quirk for C-Media 6206 USB Audio
ALSA: ctxfi - Fix wrong model id for UAA
ALSA: ctxfi - Clean up probe routines
ALSA: hda - Fix the previous tagra-8ch patch
ALSA: hda - Add 7.1 support for MSI GX620
ALSA: pcm - A helper function to compose PCM stream name for debug prints
ALSA: emu10k1 - Fix minimum periods for efx playback
...
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git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6
* 'topic/slab/earlyboot-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6:
slab: setup cpu caches later on when interrupts are enabled
slab,slub: don't enable interrupts during early boot
slab: fix gfp flag in setup_cpu_cache()
x86: make zap_low_mapping could be used early
irq: slab alloc for default irq_affinity
memcg: fix page_cgroup fatal error in FLATMEM
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* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-lguest: (31 commits)
lguest: add support for indirect ring entries
lguest: suppress notifications in example Launcher
lguest: try to batch interrupts on network receive
lguest: avoid sending interrupts to Guest when no activity occurs.
lguest: implement deferred interrupts in example Launcher
lguest: remove obsolete LHREQ_BREAK call
lguest: have example Launcher service all devices in separate threads
lguest: use eventfds for device notification
eventfd: export eventfd_signal and eventfd_fget for lguest
lguest: allow any process to send interrupts
lguest: PAE fixes
lguest: PAE support
lguest: Add support for kvm_hypercall4()
lguest: replace hypercall name LHCALL_SET_PMD with LHCALL_SET_PGD
lguest: use native_set_* macros, which properly handle 64-bit entries when PAE is activated
lguest: map switcher with executable page table entries
lguest: fix writev returning short on console output
lguest: clean up length-used value in example launcher
lguest: Segment selectors are 16-bit long. Fix lg_cpu.ss1 definition.
lguest: beyond ARRAY_SIZE of cpu->arch.gdt
...
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git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-module-and-param
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-module-and-param:
module: cleanup FIXME comments about trimming exception table entries.
module: trim exception table on init free.
module: merge module_alloc() finally
uml module: fix uml build process due to this merge
x86 module: merge the rest functions with macros
x86 module: merge the same functions in module_32.c and module_64.c
uvesafb: improve parameter handling.
module_param: allow 'bool' module_params to be bool, not just int.
module_param: add __same_type convenience wrapper for __builtin_types_compatible_p
module_param: split perm field into flags and perm
module_param: invbool should take a 'bool', not an 'int'
cyber2000fb.c: use proper method for stopping unload if CONFIG_ARCH_SHARK
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86: Provide _sdata in the vmlinux.lds.S file
x86: handle initrd that extends into unusable memory
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This version requires that host and guest have the same PAE status.
NX cap is not offered to the guest, yet.
Signed-off-by: Matias Zabaljauregui <zabaljauregui@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Add support for kvm_hypercall4(); PAE wants it.
Signed-off-by: Matias Zabaljauregui <zabaljauregui at gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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replace LHCALL_SET_PMD with LHCALL_SET_PGD hypercall name
(That's really what it is, and the confusion gets worse with PAE support)
Signed-off-by: Matias Zabaljauregui <zabaljauregui@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reported-by: Jeremy Fitzhardinge <jeremy@goop.org>
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PAE is activated
Some cleanups and replace direct assignment with native_set_* macros which properly handle 64-bit entries when PAE is activated
Signed-off-by: Matias Zabaljauregui <zabaljauregui@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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The downside of the last patch which made restore_flags and irq_enable
check interrupts is that they are now too big to be patched directly
into the callsites, so the C versions are always used.
But the C versions go via PV_CALLEE_SAVE_REGS_THUNK which saves all
the registers. In fact, we don't need any registers in the fast path,
so we can do better than this if we actually code them in assembler.
The results are in the noise, but since it's about the same amount of
code, it's worth applying.
1GB Guest->Host: input(suppressed),output(suppressed)
Before:
Seconds: 0:16.53
Packets: 377268,753673
Interrupts: 22461,24297
Notifications: 1(5245),21303(732370)
Net IRQs triggered: 377023(245),42578(711095)
After:
Seconds: 0:16.48
Packets: 377289,753673
Interrupts: 22281,24465
Notifications: 1(5245),21296(732377)
Net IRQs triggered: 377060(229),42564(711109)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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lguest never checked for pending interrupts when enabling interrupts, and
things still worked. However, it makes a significant difference to TCP
performance, so it's time we fixed it by introducing a pending_irq flag
and checking it on irq_restore and irq_enable.
These two routines are now too big to patch into the 8/10 bytes
patch space, so we drop that code.
Note: The high latency on interrupt delivery had a very curious
effect: once everything else was optimized, networking without GSO was
faster than networking with GSO, since more interrupts were sent and
hence a greater chance of one getting through to the Guest!
Note2: (Almost) Closing the same loophole for iret doesn't have any
measurable effect, so I'm leaving that patch for the moment.
Before:
1GB tcpblast Guest->Host: 30.7 seconds
1GB tcpblast Guest->Host (no GSO): 76.0 seconds
After:
1GB tcpblast Guest->Host: 6.8 seconds
1GB tcpblast Guest->Host (no GSO): 27.8 seconds
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Copy from arch/x86/kernel/irqinit_32.c: we don't use the vectors beyond
LGUEST_IRQS (if any), but we might as well set them all.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Sachin Sant reported these compiler errors:
CC arch/powerpc/kernel/power7-pmu.o
arch/powerpc/kernel/power7-pmu.c:297: error: PERF_COUNT_CPU_CYCLES undeclared here (not in a function)
Which happened because a last-minute rename of symbols crossed with
the Power7 support patch.
Fix this by using the new symbol names.
Reported-by: Sachin Sant <sachinp@in.ibm.com>
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@ozlabs.org
LKML-Reference: <1244788494.5554.1.camel@ht.satnam>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Everyone cut and paste this comment from my original one. We now do
it generically, so cut the comments.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Amerigo Wang <amwang@redhat.com>
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It's theoretically possible that there are exception table entries
which point into the (freed) init text of modules. These could cause
future problems if other modules get loaded into that memory and cause
an exception as we'd see the wrong fixup. The only case I know of is
kvm-intel.ko (when CONFIG_CC_OPTIMIZE_FOR_SIZE=n).
Amerigo fixed this long-standing FIXME in the x86 version, but this
patch is more general.
This implements trim_init_extable(); most archs are simple since they
use the standard lib/extable.c sort code. Alpha and IA64 use relative
addresses in their fixups, so thier trimming is a slight variation.
Sparc32 is unique; it doesn't seem to define ARCH_HAS_SORT_EXTABLE,
yet it defines its own sort_extable() which overrides the one in lib.
It doesn't sort, so we have to mark deleted entries instead of
actually trimming them.
Inspired-by: Amerigo Wang <amwang@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: linux-alpha@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
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As Christoph Hellwig suggested, module_alloc() actually can be
unified for i386 and x86_64 (of course, also UML).
Signed-off-by: WANG Cong <amwang@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: 'Ingo Molnar' <mingo@elte.hu>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Due to the previous merge, uml needs to be fixed.
Signed-off-by: WANG Cong <amwang@redhat.com>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Merge the rest functions together, with proper preprocessing directives.
Finally remove module_{32|64}.c.
Signed-off-by: WANG Cong <amwang@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Merge the same functions both in module_32.c and module_64.c into
module.c.
This is the first step to merge both of them finally.
Signed-off-by: WANG Cong <amwang@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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The fixed-function performance counters do not work on current Atom
processors. Use the general-purpose ones instead.
Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20090612080855.GA2286@ywang-moblin2.bj.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Only one cpu is there, just call __flush_tlb for it. Fixes the following boot
warning on x86:
[ 0.000000] Memory: 885032k/915540k available (5993k kernel code, 29844k reserved, 3842k data, 428k init, 0k highmem)
[ 0.000000] virtual kernel memory layout:
[ 0.000000] fixmap : 0xffe17000 - 0xfffff000 (1952 kB)
[ 0.000000] vmalloc : 0xf8615000 - 0xffe15000 ( 120 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xf7e15000 ( 894 MB)
[ 0.000000] .init : 0xc19a5000 - 0xc1a10000 ( 428 kB)
[ 0.000000] .data : 0xc15da4bb - 0xc199af6c (3842 kB)
[ 0.000000] .text : 0xc1000000 - 0xc15da4bb (5993 kB)
[ 0.000000] Checking if this processor honours the WP bit even in supervisor mode...Ok.
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: at kernel/smp.c:369 smp_call_function_many+0x50/0x1b0()
[ 0.000000] Hardware name: System Product Name
[ 0.000000] Modules linked in:
[ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.30-tip #52504
[ 0.000000] Call Trace:
[ 0.000000] [<c104aa16>] warn_slowpath_common+0x65/0x95
[ 0.000000] [<c104aa58>] warn_slowpath_null+0x12/0x15
[ 0.000000] [<c1073bbe>] smp_call_function_many+0x50/0x1b0
[ 0.000000] [<c1037615>] ? do_flush_tlb_all+0x0/0x41
[ 0.000000] [<c1037615>] ? do_flush_tlb_all+0x0/0x41
[ 0.000000] [<c1073d4f>] smp_call_function+0x31/0x58
[ 0.000000] [<c1037615>] ? do_flush_tlb_all+0x0/0x41
[ 0.000000] [<c104f635>] on_each_cpu+0x26/0x65
[ 0.000000] [<c10374b5>] flush_tlb_all+0x19/0x1b
[ 0.000000] [<c1032ab3>] zap_low_mappings+0x4d/0x56
[ 0.000000] [<c15d64b5>] ? printk+0x14/0x17
[ 0.000000] [<c19b42a8>] mem_init+0x23d/0x245
[ 0.000000] [<c19a56a1>] start_kernel+0x17a/0x2d5
[ 0.000000] [<c19a5347>] ? unknown_bootoption+0x0/0x19a
[ 0.000000] [<c19a5039>] __init_begin+0x39/0x41
[ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
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The sparseirq changes (d7e51e66) played poorly with the Blackfin irqchip
implementation as we're still using the old hardirq method. Our bad irq
structure had a NULL kstat_irqs field so when all the common code tries
to increment this field, everything goes big bada boom.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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The massive nommu update (8feae131) left the local variable "vml" unused,
so punt it.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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We have some test code that runs in userspace that exercises the exception
handling of the Blackfin pretty thoroughly. Part of the validation process
is checking the exact exception triggered, so export the last one seen to
userspace via debugfs when debugging is enabled for the test code to check.
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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