On Fri, Jan 27, 2012 at 12:15:51PM -0800, Andrew Morton wrote:

quoted

The accounting code will be compiled in by default
(CONFIG_READAHEAD_STATS=y), and will remain inactive by default.

I agree with those choices.  They effectively mean that the stats will
be a developer-only/debugger-only thing.  So even if the atomic_inc()
costs are measurable during these develop/debug sessions, is anyone
likely to care?

Sorry I have changed the default to CONFIG_READAHEAD_STATS=n to avoid
bloating the kernel (and forgot to edit the changelog accordingly).

I'm not sure how many people are going to check the readahead stats.

Thanks,
Fengguang

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