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Subject[Suspend2][ 15/32] [Suspend2] Submit batched i/o.
Date
Submit a group of pages that have been batched up.

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

kernel/power/suspend_block_io.c | 42 +++++++++++++++++++++++++++++++++++++++
1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
index 4d489f4..07db518 100644
--- a/kernel/power/suspend_block_io.c
+++ b/kernel/power/suspend_block_io.c
@@ -514,3 +514,45 @@ static int submit(int rw, struct io_info
return error;
}

+/*
+ * submit a batch. The submit function can wait on I/O, so we have
+ * simple locking to avoid infinite recursion.
+ */
+static int submit_batched(void)
+{
+ static int running_already = 0;
+ struct io_info *first;
+ unsigned long flags;
+ int num_submitted = 0;
+
+ running_already = 1;
+ spin_lock_irqsave(&ioinfo_submit_lock, flags);
+ while(!list_empty(&ioinfo_submit_batch)) {
+ first = list_entry(ioinfo_submit_batch.next, struct io_info,
+ list);
+
+ BUG_ON(!test_and_clear_bit(IO_AWAITING_SUBMIT, &first->flags));
+
+ list_del_init(&first->list);
+
+ atomic_dec(&submit_batch);
+
+ spin_unlock_irqrestore(&ioinfo_submit_lock, flags);
+
+ if (test_bit(IO_AWAITING_READ, &first->flags))
+ submit(READ, first);
+ else
+ submit(WRITE, first);
+
+ spin_lock_irqsave(&ioinfo_submit_lock, flags);
+
+ num_submitted++;
+ if (num_submitted == submit_batch_size)
+ break;
+ }
+ spin_unlock_irqrestore(&ioinfo_submit_lock, flags);
+ running_already = 0;
+
+ return num_submitted;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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