- 30 Jan, 2008 40 commits
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Nick Piggin authored
Introduce ticket lock spinlocks for x86 which are FIFO. The implementation is described in the comments. The straight-line lock/unlock instruction sequence is slightly slower than the dec based locks on modern x86 CPUs, however the difference is quite small on Core2 and Opteron when working out of cache, and becomes almost insignificant even on P4 when the lock misses cache. trylock is more significantly slower, but they are relatively rare. On an 8 core (2 socket) Opteron, spinlock unfairness is extremely noticable, with a userspace test having a difference of up to 2x runtime per thread, and some threads are starved or "unfairly" granted the lock up to 1 000 000 (!) times. After this patch, all threads appear to finish at exactly the same time. The memory ordering of the lock does conform to x86 standards, and the implementation has been reviewed by Intel and AMD engineers. The algorithm also tells us how many CPUs are contending the lock, so lockbreak becomes trivial and we no longer have to waste 4 bytes per spinlock for it. After this, we can no longer spin on any locks with preempt enabled and cannot reenable interrupts when spinning on an irq safe lock, because at that point we have already taken a ticket and the would deadlock if the same CPU tries to take the lock again. These are questionable anyway: if the lock happens to be called under a preempt or interrupt disabled section, then it will just have the same latency problems. The real fix is to keep critical sections short, and ensure locks are reasonably fair (which this patch does). Signed-off-by:
Nick Piggin <npiggin@suse.de> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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Nick Piggin authored
The break_lock data structure and code for spinlocks is quite nasty. Not only does it double the size of a spinlock but it changes locking to a potentially less optimal trylock. Put all of that under CONFIG_GENERIC_LOCKBREAK, and introduce a __raw_spin_is_contended that uses the lock data itself to determine whether there are waiters on the lock, to be used if CONFIG_GENERIC_LOCKBREAK is not set. Rename need_lockbreak to spin_needbreak, make it use spin_is_contended to decouple it from the spinlock implementation, and make it typesafe (rwlocks do not have any need_lockbreak sites -- why do they even get bloated up with that break_lock then?). Signed-off-by:
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Markus Metzger authored
Here's the new ptrace BTS API that supports two different overflow handling mechanisms (wrap-around and buffer-full-signal) to support two different use cases (debugging and profiling). It further combines buffer allocation and configuration. Opens: - memory rlimit - overflow signal What would be the right signal to use? Signed-off-by:
Markus Metzger <markus.t.metzger@intel.com> Signed-off-by:
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Markus Metzger authored
Change the ptrace interface to mimick an array from newst to oldest. Signed-off-by:
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Markus Metzger authored
Replace sched_clock() with jiffies for BTS timestamps. Signed-off-by:
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Markus Metzger authored
Remove no longer correct comment. Signed-off-by:
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Glauber de Oliveira Costa authored
By Andi Kleen's suggestion, this patch removes pack_ldt() and pack_tss() wrappers in favour of a general wrapper. It saves us an ifdef and some lines of code, but more importantly, it's more elegant. No functional change is made, although the object code is expected to be different. Signed-off-by:
Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by:
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Huang, Ying authored
Because the EFI memory map are converted to e820 memory map in bootloader, the EFI memory map handling code is removed to clean up. Signed-off-by:
Huang Ying <ying.huang@intel.com> Cc: Andi Kleen <ak@suse.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Huang, Ying authored
This patch removes the duplicated code between efi_32.c and efi.c. Signed-off-by:
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Huang, Ying authored
This patch adds document for EFI x86_64 runtime services support. Signed-off-by:
Chandramouli Narayanan <mouli@linux.intel.com> Signed-off-by:
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Huang, Ying authored
This patch adds support for several EFI runtime services for EFI x86_64 system. The EFI support for emergency_restart is added. Signed-off-by:
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Huang, Ying authored
This patch adds basic runtime services support for EFI x86_64 system. The main file of the patch is the addition of efi_64.c for x86_64. This file is modeled after the EFI IA32 avatar. EFI runtime services initialization are implemented in efi_64.c. Some x86_64 specifics are worth noting here. On x86_64, parameters passed to EFI firmware services need to follow the EFI calling convention. For this purpose, a set of functions named efi_call<x> (<x> is the number of parameters) are implemented. EFI function calls are wrapped before calling the firmware service. The duplicated code between efi_32.c and efi_64.c is placed in efi.c to remove them from efi_32.c. Signed-off-by:
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Daniel Walker authored
Converted to a mutex, and changed the name to mce_read_mutex. Signed-off-by:
Daniel Walker <dwalker@mvista.com> Signed-off-by:
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Aaron Durbin authored
Add the ability to reboot an x86_64 based machine using the RESET_REG in the FADT ACPI table. Signed-off-by:
Aaron Durbin <adurbin@google.com> Cc: Len Brown <lenb@kernel.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by:
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Ingo Molnar authored
dummy placeholder for acpi/reboot.h Signed-off-by:
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Jeff Dike authored
git-x86.patch introduces asm-x86/asm.h. UML needs to follow this with an asm/asm.h of its own. Signed-off-by:
Jeff Dike <jdike@linux.intel.com> Signed-off-by:
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Andrew Morton authored
arch/x86/vdso/vgetcpu.c: In function '__vdso_getcpu': arch/x86/vdso/vgetcpu.c:22: warning: pointer targets in passing argument 1 of 'native_read_tscp' differ in signedness Signed-off-by:
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Harvey Harrison authored
Signed-off-by:
Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by:
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Harvey Harrison authored
fastcall is always defined to be empty, remove it from arch/x86 Signed-off-by:
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Harvey Harrison authored
FASTCALL is always empty after the x86 removal. Signed-off-by:
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Harvey Harrison authored
FASTCALL() is always empty. Signed-off-by:
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Harvey Harrison authored
With the x86 removal, FASTCALL is always empty now. Signed-off-by:
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Glauber de Oliveira Costa authored
This patch unifies the set_tss_desc between i386 and x86_64, which can now have a common implementation. After the old functions are removed from desc_{32,64}.h, nothing important is left, and the files can be removed. Signed-off-by: -
Glauber de Oliveira Costa authored
This patch moves _set_gate and its users to desc.h. We can now use common code for x86_64 and i386. [ mingo@elte.hu: set_system_gate() fixes for nasty crashes. ] Signed-off-by:
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Glauber de Oliveira Costa authored
With the types used to access descriptors in x86_64 and i386 now being the same, the code that effectively handles them can now be easily shared. This patch moves the paravirt part of desc_32.h into desc.h, and then, we get paravirt support in x86_64 for free. Signed-off-by:
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Glauber de Oliveira Costa authored
This patch makes get_desc_base() receive a struct desc_struct, and then uses its internal fields to compute the base address. This is done at both i386 and x86_64, and then it is moved to common header Signed-off-by:
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Glauber de Oliveira Costa authored
This patch changes the type of tls_array in x86_64 to a desc_struct. Now, both i386 and x86_64 tls_array have the same type, and code accessing it can be shared. Signed-off-by:
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Glauber de Oliveira Costa authored
This patch unifies the non-paravirt part of desc_{32,64}.h into desc.h. Most of it, is simply common code, that is moved to the shared header. The only exception is the set_ldt_desc in desc_64.h, which is changed - included its name - to accomodate for the way the ldt is set up in i386. Also, constant definitions used in desc_32.h are moved to desc_defs.h Signed-off-by: -
Glauber de Oliveira Costa authored
this patch moves constant definitions regarding descriptor types from desc_32.h to desc_defs.h. The change from defines to enum to comply with previous versions in desc_defs.h Signed-off-by:
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Glauber de Oliveira Costa authored
this patch changes the signature of write_ldt_entry. Signed-off-by:
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Glauber de Oliveira Costa authored
This patch changes the write_gdt_entry function signature. Instead of the old "a" and "b" parameters, it now receives a pointer to a desc_struct, and the size of the entry being handled. This is because x86_64 can have some 16-byte entries as well as 8-byte ones. Signed-off-by:
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Glauber de Oliveira Costa authored
Provide a new type, tss_desc, to represent the tss descriptor in a unified way accross x86_64 and i386 Signed-off-by:
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Glauber de Oliveira Costa authored
This patch introduces fill_ldt(), which populates a ldt descriptor from a user_desc in once, instead of relying in the LDT_entry_a and LDT_entry_b macros Signed-off-by:
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Glauber de Oliveira Costa authored
This patch modifies the write_ldt() function to make use of the new struct desc_struct instead of entry_1 and entry_2 entries Signed-off-by:
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Glauber de Oliveira Costa authored
this patch introduces ldt_desc type to account for the differences in the ldt descriptor in x86_64 and i386 Signed-off-by:
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Glauber de Oliveira Costa authored
this patch changes write_idt_entry signature. It now takes a gate_desc instead of the a and b parameters. It will allow it to be later unified between i386 and x86_64. Signed-off-by:
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Glauber de Oliveira Costa authored
To account for the differences in gate descriptor in i386 and x86_64 a gate_desc type is introduced. Signed-off-by:
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Glauber de Oliveira Costa authored
This variable is not used anywere, and is then removed Signed-off-by:
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Glauber de Oliveira Costa authored
This patch changes the name of x86_64 macro used to access the per-cpu gdt. It is now equal to the i386 version, which will allow code to be shared. Signed-off-by:
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Glauber de Oliveira Costa authored
This patch unifies struct desc_ptr between i386 and x86_64. They can be expressed in the exact same way in C code, only having to change the name of one of them. As Xgt_desc_struct is ugly and big, this is the one that goes away. There's also a padding field in i386, but it is not really needed in the C structure definition. Signed-off-by:
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