Reading /proc/slabinfo causes stalls

From: Avleen Vig
Date: Tue Oct 16 2012 - 13:51:22 EST

I *think* this is the right place to ask this, and apologies if it's not
(is there a better place?).

We have checks which read /proc/slabinfo once a minute, and have noticed
that this causes the entire system to stall for a few milliseconds.
It's long enough that it causes noticeable delays in latency-sensitive
applications (between 10ms and 100ms).

Is this a known condition? Are there work arounds or other ways to get the
slab allocation data which don't cause stalls?

Thanks :-)
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