direct-io.hg

changeset 9499:3838105ab03b

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Various softirq cleanups:
1. Make __softirq_pending a long, since PPC borrows the file
hardirq.h from us and they only do atomic ops on longs.
2. do_softirq() explicitly takes a void param list.
3. Remove idle_timestamp field from irq_cpustat. It's unused
and lets us simplify the idle loop a little bit.

Part 1 based on a patch from Hollis Blanchard at IBM.

Signed-off-by: Keir Fraser <keir@xensource.com>
author kaf24@firebug.cl.cam.ac.uk
date Fri Mar 31 12:03:42 2006 +0100 (2006-03-31)
parents f6a7f2657ff3
children 2769a38f0e3e
files xen/arch/x86/domain.c xen/common/softirq.c xen/include/asm-x86/hardirq.h
line diff
     1.1 --- a/xen/arch/x86/domain.c	Fri Mar 31 11:04:42 2006 +0100
     1.2 +++ b/xen/arch/x86/domain.c	Fri Mar 31 12:03:42 2006 +0100
     1.3 @@ -79,15 +79,12 @@ void idle_loop(void)
     1.4  
     1.5      for ( ; ; )
     1.6      {
     1.7 -        irq_stat[cpu].idle_timestamp = jiffies;
     1.8 +        page_scrub_schedule_work();
     1.9  
    1.10 -        while ( !softirq_pending(cpu) )
    1.11 -        {
    1.12 -            page_scrub_schedule_work();
    1.13 -            default_idle();
    1.14 -        }
    1.15 +        default_idle();
    1.16  
    1.17 -        do_softirq();
    1.18 +        if ( softirq_pending(cpu) )
    1.19 +            do_softirq();
    1.20      }
    1.21  }
    1.22  

     2.1 --- a/xen/common/softirq.c	Fri Mar 31 11:04:42 2006 +0100
     2.2 +++ b/xen/common/softirq.c	Fri Mar 31 12:03:42 2006 +0100
     2.3 @@ -21,9 +21,10 @@ irq_cpustat_t irq_stat[NR_CPUS];
     2.4  
     2.5  static softirq_handler softirq_handlers[NR_SOFTIRQS];
     2.6  
     2.7 -asmlinkage void do_softirq()
     2.8 +asmlinkage void do_softirq(void)
     2.9  {
    2.10 -    unsigned int i, pending, cpu = smp_processor_id();
    2.11 +    unsigned int i, cpu = smp_processor_id();
    2.12 +    unsigned long pending;
    2.13  
    2.14      pending = softirq_pending(cpu);
    2.15      ASSERT(pending != 0);

     3.1 --- a/xen/include/asm-x86/hardirq.h	Fri Mar 31 11:04:42 2006 +0100
     3.2 +++ b/xen/include/asm-x86/hardirq.h	Fri Mar 31 12:03:42 2006 +0100
     3.3 @@ -5,10 +5,9 @@
     3.4  #include <xen/cache.h>
     3.5  
     3.6  typedef struct {
     3.7 -	unsigned int __softirq_pending;
     3.8 +	unsigned long __softirq_pending;
     3.9  	unsigned int __local_irq_count;
    3.10  	unsigned int __nmi_count;
    3.11 -	unsigned long idle_timestamp;
    3.12  } __cacheline_aligned irq_cpustat_t;
    3.13  
    3.14  #include <xen/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */