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Add BPF_HISTOGRAM type and print support
This adds support for a specialized histogram type, which underneath maps to an array or a hash table, depending on key type. With no arguments, it takes on the type `u64 table[64];`. The other current supported key type is `struct { int32|int64 bucket; int32|int64 slot }`. To print these automatically, print_log2_hist is underneath split into two types of printouts, one which prints the single histogram, and another which prints a histogram for each unique `bucket` value. See test_histogram.py for examples. Fixes: #144 Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>
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Brenden Blanco
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Sep 24, 2015
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