This removes the dependency on interrupts to wake up task. Set task
state as TASK_RUNNING, if need_resched() returns true,
while polling for IO completion.
Earlier, polling task used to sleep, relying on interrupt to wake it up.
This made some IO take very long when interrupt-coalescing is enabled in


Changes since v2->v3:
        -using __set_current_state() instead of set_current_state()

Changes since v1->v2:
        -setting task state once in blk_poll, instead of multiple
Signed-off-by: Nitesh Shetty <>
 block/blk-mq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index df93102..3574927 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3164,6 +3164,7 @@ static bool __blk_mq_poll(struct blk_mq_hw_ctx *hctx, 
struct request *rq)
+       __set_current_state(TASK_RUNNING);
        return false;

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