Curt,
Some thoughts about the interface..before dipping into the code.
On Sat, Aug 13, 2011 at 06:47:25AM +0800, Curt Wohlgemuth wrote:
> Add a new file, /proc/writeback/stats, which displays
That's creating a new top directory in /proc. Do you have plans for
adding more files under it?
> machine global data for how many pages were cleaned for
> which reasons. It also displays some additional counts for
> various writeback events.
>
> These data are also available for each BDI, in
> /sys/block/<device>/bdi/writeback_stats .
> Sample output:
>
> page: balance_dirty_pages 2561544
> page: background_writeout 5153
> page: try_to_free_pages 0
> page: sync 0
> page: kupdate 102723
> page: fdatawrite 1228779
> page: laptop_periodic 0
> page: free_more_memory 0
> page: fs_free_space 0
> periodic writeback 377
> single inode wait 0
> writeback_wb wait 1
That's already useful data, and could be further extended (in
future patches) to answer questions like "what's the writeback
efficiency in terms of effective chunk size?"
So in future there could be lines like
pages: balance_dirty_pages 2561544
chunks: balance_dirty_pages XXXXXXX
works: balance_dirty_pages XXXXXXX
or even derived lines like
pages_per_chunk: balance_dirty_pages XXXXXXX
pages_per_work: balance_dirty_pages XXXXXXX
Another question is, how can the display format be script friendly?
The current form looks not easily parse-able at least for "cut"..
Thanks,
Fengguang
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