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Update patch from Ming to match latest upstream submission

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This commit is contained in:
Justin M. Forbes 2015-05-01 08:50:39 -05:00
parent 684b527a52
commit 64752e521d
1 changed files with 4 additions and 4 deletions
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8
blk-loop-avoid-too-many-pending-per-work-IO.patch
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@ -32,7 +32,7 @@ Signed-off-by: Ming Lei <ming.lei@canonical.com>
2 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index d7173cb..4db0301 100644
index ae3fcb4..5a728c6 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1425,13 +1425,24 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx,
@ -44,11 +44,11 @@ index d7173cb..4db0301 100644
+
+ /*
+ * Fallback to single queue mode if the pending per work
+ * I/O number reaches 32, otherwise too many high priority
+ * I/O number reaches 16, otherwise too many high priority
+ * worker thread may effect system performance as reported
+ * in fedora live booting from squashfs over loop.
+ */
+ if (atomic_read(&lo->pending_per_work_io) >= 32)
+ if (atomic_read(&lo->pending_per_work_io) >= 16)
+ single_queue = true;
blk_mq_start_request(bd->rq);
@ -66,8 +66,8 @@ index d7173cb..4db0301 100644
if (need_sched)
queue_work(loop_wq, &lo->write_work);
} else {
+ cmd->per_work_io = true;
+ atomic_inc(&lo->pending_per_work_io);
+ cmd->per_work_io = true;
queue_work(loop_wq, &cmd->read_work);
}