diff options
| author | Konstantin Dorfman <kdorfman@codeaurora.org> | 2013-01-14 14:28:17 -0500 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-02-11 13:28:49 -0500 |
| commit | 2220eedfd7aea69008173a224975e10284fbe854 (patch) | |
| tree | 71906c2638d2e0052b15a40e71310f6984f3ee8f /drivers/mmc/card/queue.h | |
| parent | 369d321ed1baa7748e770aaaae4d8effad699633 (diff) | |
mmc: fix async request mechanism for sequential read scenarios
When current request is running on the bus and if next request fetched
by mmcqd is NULL, mmc context (mmcqd thread) gets blocked until the
current request completes. This means that if new request comes in while
the mmcqd thread is blocked, this new request can not be prepared in
parallel to current ongoing request. This may result in delaying the new
request execution and increase it's latency.
This change allows to wake up the MMC thread on new request arrival.
Now once the MMC thread is woken up, a new request can be fetched and
prepared in parallel to the current running request which means this new
request can be started immediately after the current running request
completes.
With this change read throughput is improved by 16%.
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
Reviewed-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/card/queue.h')
| -rw-r--r-- | drivers/mmc/card/queue.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h index d2a1eb4b9f9f..e20c27b2b8b4 100644 --- a/drivers/mmc/card/queue.h +++ b/drivers/mmc/card/queue.h @@ -27,6 +27,9 @@ struct mmc_queue { struct task_struct *thread; struct semaphore thread_sem; unsigned int flags; +#define MMC_QUEUE_SUSPENDED (1 << 0) +#define MMC_QUEUE_NEW_REQUEST (1 << 1) + int (*issue_fn)(struct mmc_queue *, struct request *); void *data; struct request_queue *queue; |