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regmap: async: Add tracepoints for async I/O 

Trace when we start and complete async writes, and when we start and
finish blocking for their completion. This is useful for performance
analysis of the resulting I/O patterns.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2013-02-21 19:05:48 +00:00
parent 6dbe51c251
commit fe7d4ccd1d
2 changed files with 56 additions and 0 deletions
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8
drivers/base/regmap/regmap.c
View File

@ -999,6 +999,8 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
if (!async)
return -ENOMEM;
trace_regmap_async_write_start(map->dev, reg, val_len);
async->work_buf = kzalloc(map->format.buf_size,
GFP_KERNEL | GFP_DMA);
if (!async->work_buf) {
@ -1640,6 +1642,8 @@ void regmap_async_complete_cb(struct regmap_async *async, int ret)
struct regmap *map = async->map;
bool wake;
trace_regmap_async_io_complete(map->dev);
spin_lock(&map->async_lock);
list_del(&async->list);
@ -1686,6 +1690,8 @@ int regmap_async_complete(struct regmap *map)
if (!map->bus->async_write)
return 0;
trace_regmap_async_complete_start(map->dev);
wait_event(map->async_waitq, regmap_async_is_done(map));
spin_lock_irqsave(&map->async_lock, flags);
@ -1693,6 +1699,8 @@ int regmap_async_complete(struct regmap *map)
map->async_ret = 0;
spin_unlock_irqrestore(&map->async_lock, flags);
trace_regmap_async_complete_done(map->dev);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_async_complete);

48
include/trace/events/regmap.h
View File

@ -175,6 +175,54 @@ DEFINE_EVENT(regmap_bool, regmap_cache_bypass,
);
DECLARE_EVENT_CLASS(regmap_async,
TP_PROTO(struct device *dev),
TP_ARGS(dev),
TP_STRUCT__entry(
__string( name, dev_name(dev) )
),
TP_fast_assign(
__assign_str(name, dev_name(dev));
),
TP_printk("%s", __get_str(name))
);
DEFINE_EVENT(regmap_block, regmap_async_write_start,
TP_PROTO(struct device *dev, unsigned int reg, int count),
TP_ARGS(dev, reg, count)
);
DEFINE_EVENT(regmap_async, regmap_async_io_complete,
TP_PROTO(struct device *dev),
TP_ARGS(dev)
);
DEFINE_EVENT(regmap_async, regmap_async_complete_start,
TP_PROTO(struct device *dev),
TP_ARGS(dev)
);
DEFINE_EVENT(regmap_async, regmap_async_complete_done,
TP_PROTO(struct device *dev),
TP_ARGS(dev)
);
#endif /* _TRACE_REGMAP_H */
/* This part must be outside protection */