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scsi: Implement per-cpu logging buffer

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Implement a per-cpu buffer for formatting messages to avoid line breaks
up under high load.  This patch implements scmd_printk() and
sdev_prefix_printk() using the per-cpu buffer and makes sdev_printk() a
wrapper for sdev_prefix_printk().

Tested-by: Robert Elliott <[email protected]>
Reviewed-by: Robert Elliott <[email protected]>
Signed-off-by: Hannes Reinecke <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Hannes Reinecke 2015-01-08 07:43:42 +01:00 • committed by Christoph Hellwig
commit ded85c193a
3 changed files with 133 additions and 14 deletions
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19
include/scsi/scsi_device.h
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@ -230,9 +230,6 @@ struct scsi_dh_data {
#define transport_class_to_sdev(class_dev) \
to_scsi_device(class_dev->parent)
#define sdev_printk(prefix, sdev, fmt, a...) \
dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
#define sdev_dbg(sdev, fmt, a...) \
dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
@ -240,16 +237,14 @@ struct scsi_dh_data {
* like scmd_printk, but the device name is passed in
* as a string pointer
*/
#define sdev_prefix_printk(l, sdev, p, fmt, a...) \
(p) ? \
sdev_printk(l, sdev, "[%s] " fmt, p, ##a) : \
sdev_printk(l, sdev, fmt, ##a)
extern int sdev_prefix_printk(const char *, const struct scsi_device *,
const char *, const char *, ...);
#define scmd_printk(prefix, scmd, fmt, a...) \
(scmd)->request->rq_disk ? \
sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \
(scmd)->request->rq_disk->disk_name, ##a) : \
sdev_printk(prefix, (scmd)->device, fmt, ##a)
#define sdev_printk(l, sdev, fmt, a...) \
sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
extern int scmd_printk(const char *, const struct scsi_cmnd *,
const char *, ...);
#define scmd_dbg(scmd, fmt, a...) \
do { \