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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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