- 02 May, 2007 40 commits
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Tim Hockin authored
Background: We've found that MCEs (specifically DRAM SBEs) tend to come in bunches, especially when we are trying really hard to stress the system out. The current MCE poller uses a static interval which does not care whether it has or has not found MCEs recently. Description: This patch makes the MCE poller adjust the polling interval dynamically. If we find an MCE, poll 2x faster (down to 10 ms). When we stop finding MCEs, poll 2x slower (up to check_interval seconds). The check_interval tunable becomes the max polling interval. The "Machine check events logged" printk() is rate limited to the check_interval, which should be identical behavior to the old functionality. Result: If you start to take a lot of correctable errors (not exceptions), you log them faster and more accurately (less chance of overflowing the MCA registers). If you don't take a lot of errors, you will see no change. Alternatives: I considered simply reducing the polling interval to 10 ms immediately and keeping it there as long as we continue to find errors. This felt a bit heavy handed, but does perform significantly better for the default check_interval of 5 minutes (we're using a few seconds when testing for DRAM errors). I could be convinced to go with this, if anyone felt it was not too aggressive. Testing: I used an error-injecting DIMM to create lots of correctable DRAM errors and verified that the polling interval accelerates. The printk() only happens once per check_interval seconds. Patch: This patch is against 2.6.21-rc7. Signed-Off-By:
Tim Hockin <thockin@google.com> Signed-off-by:
Andi Kleen <ak@suse.de>
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Gerd Hoffmann authored
Avoid trying to set up vgacon if there's no vga hardware present. Signed-off-by:
Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by:
Rusty Russell <rusty@rustcorp.com.au> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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Andi Kleen authored
`ret_from_sys_call' label no longer exist and `syscall_exit' label was introduced instead. Signed-off-by:
Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> Signed-off-by:
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Andrew Morton authored
WARNING: arch/x86_64/kernel/built-in.o - Section mismatch: reference to .init.data:cpu_llc_id from __ksymtab between '__ksymtab_cpu_llc_id' (at offset 0x4a0) and '__ksymtab_smp_num_siblings' It is strange to export a __cpuinitdata symbols to modules, and no module appears to use it anyway. Cc: Andi Kleen <ak@suse.de> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Eric W. Biederman authored
This patch just trivial converts from calling kernel_thread and daemonize to just calling kthread_run. Signed-off-by:
Eric W. Biederman <ebiederm@xmission.com> Signed-off-by:
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Zachary Amsden authored
Add comment and condense code to make use of native_local_ptep_get_and_clear function. Also, it turns out the 2-level and 3-level paging definitions were identical, so move the common definition into pgtable.h Signed-off-by:
Zachary Amsden <zach@vmware.com> Signed-off-by:
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Zachary Amsden authored
In situations where page table updates need only be made locally, and there is no cross-processor A/D bit races involved, we need not use the heavyweight xchg instruction to atomically fetch and clear page table entries. Instead, we can just read and clear them directly. This introduces a neat optimization for non-SMP kernels; drop the atomic xchg operations from page table updates. Thanks to Michel Lespinasse for noting this potential optimization. Signed-off-by:
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Zachary Amsden authored
When exiting from an address space, no special hypervisor notification of page table updates needs to occur; direct page table hypervisors, such as Xen, switch to another address space first (init_mm) and unprotects the page tables to avoid the cost of trapping to the hypervisor for each pte_clear. Shadow mode hypervisors, such as VMI and lhype don't need to do the extra work of calling through paravirt-ops, and can just directly clear the page table entries without notifiying the hypervisor, since all the page tables are about to be freed. So introduce native_pte_clear functions which bypass any paravirt-ops notification. This results in a significant performance win for VMI and removes some indirect calls from zap_pte_range. Note the 3-level paging already had a native_pte_clear function, thus demanding argument conformance and extra args for the 2-level definition. Signed-off-by:
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Daniel Walker authored
The locking of the xtime_lock around the cpu notifier is unessesary now. At one time the tsc was used after a frequency change for timekeeping, but the re-write of timekeeping no longer uses the TSC unless the frequency is constant. The variables that are changed in this section of code had also once been used for timekeeping, but not any longer .. Signed-off-by:
Daniel Walker <dwalker@mvista.com> Signed-off-by:
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Siddha, Suresh B authored
Set use_alien_caches to 0 on non NUMA platforms. And avoid calling the cache_free_alien() when use_alien_caches is not set. This will avoid the cache miss that happens while dereferencing slabp to get nodeid. Signed-off-by:
Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by:
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Andi Kleen authored
No need to maintain it anymore Signed-off-by: -
Joachim Deguara authored
Currently the i386 architecture checks the family for mce capability and this removes that and uses the CPUID information. Tested on a K8 revE and a family10h processor. This eliminates checking of a set AMD procesor family if mce is allowed and relies on the information being in CPUID. Signed-off-by:
Joachim Deguara <joachim.deguara@amd.com> Signed-off-by:
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Keshavamurthy, Anil S authored
Cleanup flush_tlb_others(), no functional change. Signed-off-by:
Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by:
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Hisashi Hifumi authored
IRQ is already disabled through local_irq_disable(). So spin_lock_irqsave() can be replaced with spin_lock(). Signed-off-by:
Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp> Signed-off-by:
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Keshavamurthy, Anil S authored
Avoid checking for cpu gone in mm hot path when CONFIG_HOTPLUG_CPU is not defined. Signed-off-by:
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Eric Dumazet authored
We apparently hit the 1024 limit of vsyscall_0 zone when some debugging options are set, or if __vsyscall_gtod_data is 64 bytes larger. In order to save 128 bytes from the vsyscall_0 zone, we move __vgetcpu_mode & __jiffies to vsyscall_2 zone where they really belong, since they are used only from vgetcpu() (which is in this vsyscall_2 area). After patch is applied, new layout is : ffffffffff600000 T vgettimeofday ffffffffff60004e t vsysc2 ffffffffff600140 t vread_hpet ffffffffff600150 t vread_tsc ffffffffff600180 D __vsyscall_gtod_data ffffffffff600400 T vtime ffffffffff600413 t vsysc1 ffffffffff600800 T vgetcpu ffffffffff600870 D __vgetcpu_mode ffffffffff600880 D __jiffies ffffffffff600c00 T venosys_1 Signed-off-by:
Eric Dumazet <dada1@cosmosbay.com> Signed-off-by:
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Jeremy Fitzhardinge authored
startup_ipi_hook depends on CONFIG_X86_LOCAL_APIC, so move it to the right part of the paravirt_ops initialization. Signed-off-by:
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Randy Dunlap authored
Fix section mismatch warnings in mtrr code. Fix line length on one source line. WARNING: arch/x86_64/kernel/built-in.o - Section mismatch: reference to .init.data: from .text.get_mtrr_state after 'get_mtrr_state' (at offset 0x103) WARNING: arch/x86_64/kernel/built-in.o - Section mismatch: reference to .init.text: from .text.get_mtrr_state after 'get_mtrr_state' (at offset 0x180) WARNING: arch/x86_64/kernel/built-in.o - Section mismatch: reference to .init.text: from .text.get_mtrr_state after 'get_mtrr_state' (at offset 0x199) WARNING: arch/x86_64/kernel/built-in.o - Section mismatch: reference to .init.text: from .text.get_mtrr_state after 'get_mtrr_state' (at offset 0x1c1) Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by:
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Use safe_apic_wait_icr_idle to check ICR idle bit if the vector is NMI_VECTOR to avoid potential hangups in the event of crash when kdump tries to stop the other CPUs. Signed-off-by:
Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> Signed-off-by:
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Use safe_apic_wait_icr_idle to check ICR idle bit if the vector is NMI_VECTOR to avoid potential hangups in the event of crash when kdump tries to stop the other CPUs. Signed-off-by:
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Implement __send_IPI_dest_field which can be used to send IPIs when the "destination shorthand" field of the ICR is set to 00 (destination field). Use it whenever possible. Signed-off-by:
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Implement __send_IPI_dest_field which can be used to send IPIs when the "destination shorthand" field of the ICR is set to 00 (destination field). Use it whenever possible. Signed-off-by:
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Fernando Luis VazquezCao authored
inquire_remote_apic is used for APIC debugging, so use safe_apic_wait_icr_idle instead of apic_wait_icr_idle to avoid possible lockups when APIC delivery fails. Signed-off-by:
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Fernando Luis VazquezCao authored
__inquire_remote_apic is used for APIC debugging, so use safe_apic_wait_icr_idle instead of apic_wait_icr_idle to avoid possible lockups when APIC delivery fails. Signed-off-by:
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Fernando Luis VazquezCao authored
The functionality provided by the new safe_apic_wait_icr_idle is being open-coded all over "kernel/smpboot.c". Use safe_apic_wait_icr_idle instead to consolidate code and ease maintenance. Signed-off-by:
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Fernando Luis VazquezCao authored
The functionality provided by the new safe_apic_wait_icr_idle is being open-coded all over "kernel/smpboot.c". Use safe_apic_wait_icr_idle instead to consolidate code and ease maintenance. Signed-off-by:
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Fernando Luis VazquezCao authored
apic_wait_icr_idle looks like this: static __inline__ void apic_wait_icr_idle(void) { while (apic_read(APIC_ICR) & APIC_ICR_BUSY) cpu_relax(); } The busy loop in this function would not be problematic if the corresponding status bit in the ICR were always updated, but that does not seem to be the case under certain crash scenarios. Kdump uses an IPI to stop the other CPUs in the event of a crash, but when any of the other CPUs are locked-up inside the NMI handler the CPU that sends the IPI will end up looping forever in the ICR check, effectively hard-locking the whole system. Quoting from Intel's "MultiProcessor Specification" (Version 1.4), B-3: "A local APIC unit indicates successful dispatch of an IPI by resetting the Delivery Status bit in the Interrupt Command Register (ICR). The operating system polls the delivery status bit after sending an INIT or STARTUP IPI until the command has been dispatched. A period of 20 microseconds should be sufficient for IPI dispatch to complete under normal operating conditions. If the IPI is not successfully dispatched, the operating system can abort the command. Alternatively, the operating system can retry the IPI by writing the lower 32-bit double word of the ICR. This “time-out” mechanism can be implemented through an external interrupt, if interrupts are enabled on the processor, or through execution of an instruction or time-stamp counter spin loop." Intel's documentation suggests the implementation of a time-out mechanism, which, by the way, is already being open-coded in some parts of the kernel that tinker with ICR. Create a apic_wait_icr_idle replacement that implements the time-out mechanism and that can be used to solve the aforementioned problem. AK: moved both functions out of line AK: Added improved loop from Keith Owens Signed-off-by: -
Fernando Luis VazquezCao authored
apic_wait_icr_idle looks like this: static __inline__ void apic_wait_icr_idle(void) { while (apic_read(APIC_ICR) & APIC_ICR_BUSY) cpu_relax(); } The busy loop in this function would not be problematic if the corresponding status bit in the ICR were always updated, but that does not seem to be the case under certain crash scenarios. Kdump uses an IPI to stop the other CPUs in the event of a crash, but when any of the other CPUs are locked-up inside the NMI handler the CPU that sends the IPI will end up looping forever in the ICR check, effectively hard-locking the whole system. Quoting from Intel's "MultiProcessor Specification" (Version 1.4), B-3: "A local APIC unit indicates successful dispatch of an IPI by resetting the Delivery Status bit in the Interrupt Command Register (ICR). The operating system polls the delivery status bit after sending an INIT or STARTUP IPI until the command has been dispatched. A period of 20 microseconds should be sufficient for IPI dispatch to complete under normal operating conditions. If the IPI is not successfully dispatched, the operating system can abort the command. Alternatively, the operating system can retry the IPI by writing the lower 32-bit double word of the ICR. This “time-out” mechanism can be implemented through an external interrupt, if interrupts are enabled on the processor, or through execution of an instruction or time-stamp counter spin loop." Intel's documentation suggests the implementation of a time-out mechanism, which, by the way, is already being open-coded in some parts of the kernel that tinker with ICR. Create a apic_wait_icr_idle replacement that implements the time-out mechanism and that can be used to solve the aforementioned problem. AK: moved both functions out of line AK: added improved loop from Keith Owens Signed-off-by: -
Bernhard Kaindl authored
If our copy of the MTRRs of the BSP has RdMem or WrMem set, and we are running on an AMD64/K8 system, the boot CPU must have had MtrrFixDramEn and MtrrFixDramModEn set (otherwise our RDMSR would have copied these bits cleared), so we set them on this CPU as well. This allows us to keep the AMD64/K8 RdMem and WrMem bits in sync across the CPUs of SMP systems in order to fullfill the duty of system software to "initialize and maintain MTRR consistency across all processors." as written in the AMD and Intel manuals. If an WRMSR instruction fails because MtrrFixDramModEn is not set, I expect that also the Intel-style MTRR bits are not updated. AK: minor cleanup, moved MSR defines around Signed-off-by:
Bernhard Kaindl <bk@suse.de> Signed-off-by:
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Bernhard Kaindl authored
Note: This patch didn'nt need an update since it's initial post. Some BIOSes may modify fixed-range MTRRs in SMM, e.g. when they transition the system into ACPI mode, which is entered thru an SMI, triggered by Linux in acpi_enable(). SMIs which cause that Linux is interrupted and BIOS code is executed (which may change e.g. fixed-range MTRRs) in SMM may be raised by an embedded system controller which is often found in notebooks also at other occasions. If we would not update our copy of the fixed-range MTRRs before suspending to RAM or to disk, restore_processor_state() would set the fixed-range MTRRs of the BSP using old backup values which may be outdated and this could cause the system to fail later during resume. This patch ensures that our copy of the fixed-range MTRRs is updated when saving the boot processor state on suspend to disk and suspend to RAM. In combination with other patches this allows to fix s2ram and s2disk on the Acer Ferrari 1000 notebook and at least s2disk on the Acer Ferrari 5000 notebook. Signed-off-by:
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Bernhard Kaindl authored
Applied fix by Andew Morton: http://lkml.org/lkml/2007/4/8/88 - Fix `make headers_check'. AMD and Intel x86 CPU manuals state that it is the responsibility of system software to initialize and maintain MTRR consistency across all processors in Multi-Processing Environments. Quote from page 188 of the AMD64 System Programming manual (Volume 2): 7.6.5 MTRRs in Multi-Processing Environments "In multi-processing environments, the MTRRs located in all processors must characterize memory in the same way. Generally, this means that identical values are written to the MTRRs used by the processors." (short omission here) "Failure to do so may result in coherency violations or loss of atomicity. Processor implementations do not check the MTRR settings in other processors to ensure consistency. It is the responsibility of system software to initialize and maintain MTRR consistency across all processors." Current Linux MTRR code already implements the above in the case that the BIOS does not properly initialize MTRRs on the secondary processors, but the case where the fixed-range MTRRs of the boot processor are changed after Linux started to boot, before the initialsation of a secondary processor, is not handled yet. In this case, secondary processors are currently initialized by Linux with MTRRs which the boot processor had very early, when mtrr_bp_init() did run, but not with the MTRRs which the boot processor uses at the time when that secondary processors is actually booted, causing differing MTRR contents on the secondary processors. Such situation happens on Acer Ferrari 1000 and 5000 notebooks where the BIOS enables and sets AMD-specific IORR bits in the fixed-range MTRRs of the boot processor when it transitions the system into ACPI mode. The SMI handler of the BIOS does this in SMM, entered while Linux ACPI code runs acpi_enable(). Other occasions where the SMI handler of the BIOS may change bits in the MTRRs could occur as well. To initialize newly booted secodary processors with the fixed-range MTRRs which the boot processor uses at that time, this patch saves the fixed-range MTRRs of the boot processor before new secondary processors are started. When the secondary processors run their Linux initialisation code, their fixed-range MTRRs will be updated with the saved fixed-range MTRRs. If CONFIG_MTRR is not set, we define mtrr_save_state as an empty statement because there is nothing to do. Possible TODOs: *) CPU-hotplugging outside of SMP suspend/resume is not yet tested with this patch. *) If, even in this case, an AP never runs i386/do_boot_cpu or x86_64/cpu_up, then the calls to mtrr_save_state() could be replaced by calls to mtrr_save_fixed_ranges(NULL) and mtrr_save_state() would not be needed. That would need either verification of the CPU-hotplug code or at least a test on a >2 CPU machine. *) The MTRRs of other running processors are not yet checked at this time but it might be interesting to syncronize the MTTRs of all processors before booting. That would be an incremental patch, but of rather low priority since there is no machine known so far which would require this. AK: moved prototypes on x86-64 around to fix warnings Signed-off-by:
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Bernhard Kaindl authored
In this current implementation which is used in other patches, mtrr_save_fixed_ranges() accepts a dummy void pointer because in the current implementation of one of these patches, this function may be called from smp_call_function_single() which requires that this function takes a void pointer argument. This function calls get_fixed_ranges(), passing mtrr_state.fixed_ranges which is the element of the static struct which stores our current backup of the fixed-range MTRR values which all CPUs shall be using. Because mtrr_save_fixed_ranges calls get_fixed_ranges after kernel initialisation time, __init needs to be removed from the declaration of get_fixed_ranges(). If CONFIG_MTRR is not set, we define mtrr_save_fixed_ranges as an empty statement because there is nothing to do. AK: Moved prototypes for x86-64 around to fix warnings Signed-off-by:
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Andi Kleen authored
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Jeremy Fitzhardinge authored
Three cleanups: 1: ELF notes are never mapped, so there's no need to have any access flags in their phdr. 2: When generating them from asm, tell the assembler to use a SHT_NOTE section type. There doesn't seem to be a way to do this from C. 3: Use ANSI rather than traditional cpp behaviour to stringify the macro argument. Signed-off-by:
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Andi Kleen authored
Otherwise non GPL modules cannot even do basic operations like disabling interrupts anymore, which would be excessive. Longer term should split the single structure up into internal and external symbols and not export the internal ones at all. Signed-off-by: -
Jeremy Fitzhardinge authored
The other symbols used to delineate the alt-instructions sections have the form __foo/__foo_end. Rename parainstructions to match. Signed-off-by:
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Zachary Amsden authored
Convert VMI timer to use clock events, making it properly able to use the NO_HZ infrastructure. On UP systems, with no local APIC, we just continue to route these events through the PIT. On systems with a local APIC, or SMP, we provide a single source interrupt chip which creates the local timer IRQ. It actually gets delivered by the APIC hardware, but we don't want to use the same local APIC clocksource processing, so we create our own handler here. Signed-off-by:
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Zachary Amsden authored
Implement vmi_kmap_atomic_pte in terms of the backend set_linear_mapping operation. The conversion is rather straighforward; call kmap_atomic and then inform the hypervisor of the page mapping. The _flush_tlb damage is due to macros being pulled in from highmem.h. Signed-off-by:
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Zachary Amsden authored
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Zachary Amsden authored
No, just no. You do not use goto to skip a code block. You do not return an obvious variable from a singly-inlined function and give the function a return value. You don't put unexplained comments about kmalloc in code which doesn't do dynamic allocation. And you don't leave stray warnings around for no good reason. Also, when possible, it is better to use block scoped variables because gcc can sometime generate better code. Signed-off-by:
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