[PATCH 2/7] cxlflash: Limit the debug logs in the IO path

Uma Krishnan ukrishn at linux.vnet.ibm.com
Sat May 12 05:05:08 AEST 2018


The kernel log can get filled with debug messages from send_cmd_ioarrin()
when dynamic debug is enabled for the cxlflash module and there is a lot
of legacy I/O traffic.

While these messages are necessary to debug issues that involve command
tracking, the abundance of data can overwrite other useful data in the
log. The best option available is to limit the messages that should
serve most of the common use cases.

Signed-off-by: Uma Krishnan <ukrishn at linux.vnet.ibm.com>
---
 drivers/scsi/cxlflash/main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index dad2be6..cf0b407 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -339,8 +339,8 @@ static int send_cmd_ioarrin(struct afu *afu, struct afu_cmd *cmd)
 	writeq_be((u64)&cmd->rcb, &hwq->host_map->ioarrin);
 out:
 	spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags);
-	dev_dbg(dev, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__,
-		cmd, cmd->rcb.data_len, cmd->rcb.data_ea, rc);
+	dev_dbg_ratelimited(dev, "%s: cmd=%p len=%u ea=%016llx rc=%d\n",
+		__func__, cmd, cmd->rcb.data_len, cmd->rcb.data_ea, rc);
 	return rc;
 }
 
-- 
2.1.0



More information about the Linuxppc-dev mailing list