Making thread time visible to `ps`

From: linux-os (*** Johnson) (linux-os_at_analogic.com)
Date: 09/29/05

  • Next message: Deepak Saxena: "[PATCH] Fix IXP4xx MTD driver no cast warning" 
    Date:	Thu, 29 Sep 2005 15:48:30 -0400
To: "Linux kernel" <linux-kernel@vger.kernel.org>

    Hello,

    This is the kernel thread in a module. It gets awakened
    to do some work as a result of an interrupt. It does
    the right thing and works.

    But.... `ps` never shows it using ANY cpu time! I know
    that the procedure, read_fifo() takes about 600,000 cpu
    clocks, measured with rdtsc, so I would expect that
    that time would be visible. Does anybody know how to
    make the time that a kernel thread uses, become visible
    to `ps` ???

    static int32_t local_thread(void *unused)
    {
         DAEMONIZE; // In config.h
         SET_PRIORITY(-19); // In config.h
         memcpy(current->comm, task_name, sizeof(task_name));
         set_current_state(TASK_INTERRUPTIBLE);
         schedule_timeout(0); // Let insmod complete
         __asm__ __volatile__("thread:\n.global thread\n");
         for(;;)
         {
             set_current_state(TASK_INTERRUPTIBLE);
             if(signal_pending(current))
                 complete_and_exit(&info->quit, 0);
             interruptible_sleep_on(&info->twait);
             set_current_state(TASK_RUNNING);
             read_fifo();
         }
         return 0; // Just quiet the compiler
    }

    Cheers,
    *** Johnson
    Penguin : Linux version 2.6.13 on an i686 machine (5589.55 BogoMips).
    Warning : 98.36% of all statistics are fiction.

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  • Next message: Deepak Saxena: "[PATCH] Fix IXP4xx MTD driver no cast warning"