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//
// Some read activity through the buffer cache and the cache read
// hit ratio is less than 80%
// (lots of file system reads causing physical I/O)
//
delta = 1 min; // check every minute
blkio = "kernel.all.io";
poor_read_hits =
(($blkio.lread - $blkio.bread) / $blkio.lread) < 0.8 && $blkio.lread > 100
-> alarm 20 min "poor buffer cache read hit ratio (%v)";
// Note: %v in alarm string is bound to the left most
// expression in the predicate
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