Re: bug in Real-Time Preemption

From: Milan Svoboda (milan.svoboda_at_centrum.cz)
Date: 06/10/05

  • Next message: Marcus Meissner: "Re: Problems with usb and digital camera" 
    Date:	Fri, 10 Jun 2005 11:50:59 +0200
To: <xschmi00@stud.feec.vutbr.cz>

    > Milan Svoboda wrote:
    > > under non RT preempt:
    > > (these results are expected)
    > > > ./a.out
    > > Flag: 0, Dif:11714
    > > ./a.out
    > > Flag: 0, Dif:11678
    > > > under full RT preempt:
    > > ./a.out
    > > Flag: 1, Dif:582536
    > > ./a.out
    > > Flag: 1, Dif:579791
    > > > This shows that thread with bigger priority was
    > > blocked by the thread with lower priority!
    >
    > Can you retry with RT-V0.7.48-05 and this patch applied?
    >
    > Michal
    >

    I didn't help. Results are the same.

    ./a.out
    Flag: 1, Dif: 598910

    uname -a
    Linux 2.6.12-rc6-RT-V0.7.48-05 #4 Fri Jun 10 11:26:38 CEST 2005 i686 i686 i386 GNU/Linux

    BTW: I cannot compile this version with RT disabled:

    -rc6-RT-V0.7.48-05

      CC lib/radix-tree.o
      CC lib/rbtree.o
      CC lib/rwsem.o
    lib/rwsem.c: In function `__rwsem_do_wake':
    lib/rwsem.c:57: warning: implicit declaration of function `rwsem_atomic_update'
    lib/rwsem.c:57: error: `RWSEM_ACTIVE_BIAS' undeclared (first use in this function)
    lib/rwsem.c:57: error: (Each undeclared identifier is reported only once
    lib/rwsem.c:57: error: for each function it appears in.)
    lib/rwsem.c:59: error: `RWSEM_ACTIVE_MASK' undeclared (first use in this function)
    lib/rwsem.c:62: error: structure has no member named `wait_list'
    lib/rwsem.c:85: error: structure has no member named `wait_list'
    lib/rwsem.c:99: error: structure has no member named `wait_list'
    lib/rwsem.c:108: error: `RWSEM_WAITING_BIAS' undeclared (first use in this function)
    lib/rwsem.c:113: warning: implicit declaration of function `rwsem_atomic_add'
    lib/rwsem.c:115: error: structure has no member named `wait_list'
    lib/rwsem.c:126: error: structure has no member named `wait_list'
    lib/rwsem.c:127: error: structure has no member named `wait_list'
    lib/rwsem.c: In function `rwsem_down_failed_common':
    lib/rwsem.c:153: error: structure has no member named `wait_lock'
    lib/rwsem.c:153: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:153: error: structure has no member named `wait_lock'
    lib/rwsem.c:153: error: structure has no member named `wait_lock'
    lib/rwsem.c:153: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:153: error: structure has no member named `wait_lock'
    lib/rwsem.c:157: error: structure has no member named `wait_list'
    lib/rwsem.c:163: error: `RWSEM_ACTIVE_MASK' undeclared (first use in this function)
    lib/rwsem.c:166: error: structure has no member named `wait_lock'
    lib/rwsem.c:166: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:166: error: structure has no member named `wait_lock'
    lib/rwsem.c:166: error: structure has no member named `wait_lock'
    lib/rwsem.c:166: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:166: error: structure has no member named `wait_lock'
    lib/rwsem.c: In function `rwsem_down_read_failed':
    lib/rwsem.c:193: error: `RWSEM_WAITING_BIAS' undeclared (first use in this function)
    lib/rwsem.c:193: error: `RWSEM_ACTIVE_BIAS' undeclared (first use in this function)
    lib/rwsem.c: In function `rwsem_down_write_failed':
    lib/rwsem.c:210: error: `RWSEM_ACTIVE_BIAS' undeclared (first use in this function)
    lib/rwsem.c: In function `rwsem_wake':
    lib/rwsem.c:226: error: structure has no member named `wait_lock'
    lib/rwsem.c:226: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:226: error: structure has no member named `wait_lock'
    lib/rwsem.c:226: error: structure has no member named `wait_lock'
    lib/rwsem.c:226: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:226: error: structure has no member named `wait_lock'
    lib/rwsem.c:229: error: structure has no member named `wait_list'
    lib/rwsem.c:232: error: structure has no member named `wait_lock'
    lib/rwsem.c:232: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:232: error: structure has no member named `wait_lock'
    lib/rwsem.c:232: error: structure has no member named `wait_lock'
    lib/rwsem.c:232: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:232: error: structure has no member named `wait_lock'
    lib/rwsem.c: In function `rwsem_downgrade_wake':
    lib/rwsem.c:250: error: structure has no member named `wait_lock'
    lib/rwsem.c:250: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:250: error: structure has no member named `wait_lock'
    lib/rwsem.c:250: error: structure has no member named `wait_lock'
    lib/rwsem.c:250: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:250: error: structure has no member named `wait_lock'
    lib/rwsem.c:253: error: structure has no member named `wait_list'
    lib/rwsem.c:256: error: structure has no member named `wait_lock'
    lib/rwsem.c:256: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:256: error: structure has no member named `wait_lock'
    lib/rwsem.c:256: error: structure has no member named `wait_lock'
    lib/rwsem.c:256: warning: type defaults to `int' in declaration of `type name'
    lib/rwsem.c:256: error: structure has no member named `wait_lock'
    make[1]: *** [lib/rwsem.o] Error 1

    Relevant .config:

    #
    # Processor type and features
    #
    CONFIG_X86_PC=y
    # CONFIG_X86_ELAN is not set
    # CONFIG_X86_VOYAGER is not set
    # CONFIG_X86_NUMAQ is not set
    # CONFIG_X86_SUMMIT is not set
    # CONFIG_X86_BIGSMP is not set
    # CONFIG_X86_VISWS is not set
    # CONFIG_X86_GENERICARCH is not set
    # CONFIG_X86_ES7000 is not set
    # CONFIG_M386 is not set
    # CONFIG_M486 is not set
    # CONFIG_M586 is not set
    # CONFIG_M586TSC is not set
    # CONFIG_M586MMX is not set
    CONFIG_M686=y
    # CONFIG_MPENTIUMII is not set
    # CONFIG_MPENTIUMIII is not set
    # CONFIG_MPENTIUMM is not set
    # CONFIG_MPENTIUM4 is not set
    # CONFIG_MK6 is not set
    # CONFIG_MK7 is not set
    # CONFIG_MK8 is not set
    # CONFIG_MCRUSOE is not set
    # CONFIG_MEFFICEON is not set
    # CONFIG_MWINCHIPC6 is not set
    # CONFIG_MWINCHIP2 is not set
    # CONFIG_MWINCHIP3D is not set
    # CONFIG_MGEODEGX1 is not set
    # CONFIG_MCYRIXIII is not set
    # CONFIG_MVIAC3_2 is not set
    CONFIG_X86_GENERIC=y
    CONFIG_X86_CMPXCHG=y
    CONFIG_X86_XADD=y
    CONFIG_X86_L1_CACHE_SHIFT=7
    CONFIG_GENERIC_CALIBRATE_DELAY=y
    CONFIG_X86_PPRO_FENCE=y
    CONFIG_X86_WP_WORKS_OK=y
    CONFIG_X86_INVLPG=y
    CONFIG_X86_BSWAP=y
    CONFIG_X86_POPAD_OK=y
    CONFIG_X86_GOOD_APIC=y
    CONFIG_X86_INTEL_USERCOPY=y
    CONFIG_X86_USE_PPRO_CHECKSUM=y
    CONFIG_HPET_TIMER=y
    CONFIG_HPET_EMULATE_RTC=y
    # CONFIG_SMP is not set
    CONFIG_PREEMPT_NONE=y
    # CONFIG_PREEMPT_VOLUNTARY is not set
    # CONFIG_PREEMPT_DESKTOP is not set
    # CONFIG_PREEMPT_RT is not set
    # CONFIG_PREEMPT_SOFTIRQS is not set
    # CONFIG_PREEMPT_HARDIRQS is not set
    # CONFIG_PREEMPT_BKL is not set
    CONFIG_ASM_SEMAPHORES=y
    CONFIG_RWSEM_XCHGADD_ALGORITHM=y
    CONFIG_X86_UP_APIC=y
    CONFIG_X86_UP_IOAPIC=y
    CONFIG_X86_LOCAL_APIC=y
    CONFIG_X86_IO_APIC=y
    CONFIG_X86_TSC=y
    CONFIG_X86_MCE=y
    # CONFIG_X86_MCE_NONFATAL is not set
    # CONFIG_X86_MCE_P4THERMAL is not set
    # CONFIG_TOSHIBA is not set
    # CONFIG_I8K is not set
    # CONFIG_X86_REBOOTFIXUPS is not set
    # CONFIG_MICROCODE is not set
    # CONFIG_X86_MSR is not set
    CONFIG_X86_CPUID=m

    -
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  • Next message: Marcus Meissner: "Re: Problems with usb and digital camera"

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