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Differential D60771

hwpmc: keep AMD UMC counters from saturating
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Authored by ojanerif_amd.com on Fri, Oct 16, 12:21 PM.
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afscoelho_gmail.com
anascime_amd.com
davichazbh_gmail.com
ali_mashtizadeh.com
Summary

UMC counters saturate at 2^48 instead of wrapping, after about a day
and a half of memory clock cycles. Reset the counter on a read once
bit 47 is set and keep the count in a per-CPU base.

Sponsored by: AMD
Signed-off-by: Osvaldo Janeri Filho <ojanerif@amd.com>

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rS FreeBSD src repository - subversion
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sys/
dev/
hwpmc/
25 lines

Diff 190030

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sys/dev/hwpmc/hwpmc_amd.c

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