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    Subject[Suspend2][ 04/32] [Suspend2] Check the io stats.
    Date
    Perform sanity checking at the conclusion of performing some I/O. By the
    time this is called, there should be no outstanding I/O, and the io_info
    structure lists should all be empty. We check these conditions, and display
    the vital statistics if the appropriate debugging level is enabled.

    Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

    kernel/power/suspend_block_io.c | 35 +++++++++++++++++++++++++++++++++++
    1 files changed, 35 insertions(+), 0 deletions(-)

    diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
    index 51e02ef..09682c4 100644
    --- a/kernel/power/suspend_block_io.c
    +++ b/kernel/power/suspend_block_io.c
    @@ -144,3 +144,38 @@ static void suspend_reset_io_stats(void)
    nr_schedule_calls[i] = 0;
    }

    +/*
    + * suspend_check_io_stats
    + *
    + * Description: Check that our statistics look right and print
    + * any debugging info wanted.
    + */
    +static void suspend_check_io_stats(void)
    +{
    + int i;
    +
    + BUG_ON(atomic_read(&outstanding_io));
    + BUG_ON(infopages);
    + BUG_ON(!list_empty(&ioinfo_submit_batch));
    + BUG_ON(!list_empty(&ioinfo_busy));
    + BUG_ON(!list_empty(&ioinfo_ready_for_cleanup));
    + BUG_ON(!list_empty(&ioinfo_free));
    + BUG_ON(atomic_read(&buffer_allocs) != atomic_read(&buffer_frees));
    +
    + suspend_message(SUSPEND_WRITER, SUSPEND_LOW, 0,
    + "Maximum outstanding_io was %d.\n",
    + max_outstanding_io);
    + suspend_message(SUSPEND_WRITER, SUSPEND_LOW, 0,
    + "Max info pages was %d.\n",
    + maxinfopages);
    + if (atomic_read(&buffer_allocs) != atomic_read(&buffer_frees))
    + suspend_message(SUSPEND_WRITER, SUSPEND_MEDIUM, 0,
    + "Buffer allocs (%d) != buffer frees (%d)",
    + atomic_read(&buffer_allocs),
    + atomic_read(&buffer_frees));
    + for(i = 0; i < 8; i++)
    + suspend_message(SUSPEND_WRITER, SUSPEND_MEDIUM, 0,
    + "Nr schedule calls %s: %lu.\n", sch_caller[i],
    + nr_schedule_calls[i]);
    +}
    +
    --
    Nigel Cunningham nigel at suspend2 dot net
    -
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