Author: gnn
Date: Mon Apr 9 16:14:58 2012
New Revision: 234062
URL: http://svn.freebsd.org/changeset/base/234062
Log:
MFC: 232612
Properly mask off bits that are not supported in the IAP counters.
This fixes a bug where users would see massively large counts, near
to 2**64 -1, due to the bits not being cleared.
Modified:
stable/8/sys/dev/hwpmc/hwpmc_core.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/boot/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
stable/8/sys/dev/e1000/ (props changed)
stable/8/sys/i386/conf/XENHVM (props changed)
Modified: stable/8/sys/dev/hwpmc/hwpmc_core.c
==============================================================================
--- stable/8/sys/dev/hwpmc/hwpmc_core.c Mon Apr 9 15:34:23 2012
(r234061)
+++ stable/8/sys/dev/hwpmc/hwpmc_core.c Mon Apr 9 16:14:58 2012
(r234062)
@@ -1832,7 +1832,7 @@ iap_read_pmc(int cpu, int ri, pmc_value_
if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
*v = iap_perfctr_value_to_reload_count(tmp);
else
- *v = tmp;
+ *v = tmp & ((1ULL << core_iap_width) - 1);
PMCDBG(MDP,REA,1, "iap-read cpu=%d ri=%d msr=0x%x -> v=%jx", cpu, ri,
ri, *v);
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