Re: [PATCH 5/8] readahead: add /debug/readahead/stats

[Andi Kleen]

> +static unsigned long ra_stats[RA_PATTERN_MAX][RA_ACCOUNT_MAX];

Why not make it per cpu?  That should get the overhead down, probably
even enough that it can be enabled by default.

BTW I have an older framework to make it really easy to add per
cpu stats counters to debugfs. Will repost, that would simplify
it even more.

-Andi
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