FreeBSD Bugzilla – Attachment 156477 Details for
Bug 198149
[hwpmc] pmcstat -P -t (top mode, process sampling) stops after a while
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[patch]
first_hack.patch
file_198149.txt (text/plain), 541 bytes, created by
John Baldwin
on 2015-05-07 19:59:05 UTC
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Description:
first_hack.patch
Filename:
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Creator:
John Baldwin
Created:
2015-05-07 19:59:05 UTC
Size:
541 bytes
patch
obsolete
>diff --git a/sys/dev/hwpmc/hwpmc_core.c b/sys/dev/hwpmc/hwpmc_core.c >index afa5def..c9b46c5 100644 >--- a/sys/dev/hwpmc/hwpmc_core.c >+++ b/sys/dev/hwpmc/hwpmc_core.c >@@ -203,8 +203,8 @@ core_pcpu_fini(struct pmc_mdep *md, int cpu) > static pmc_value_t > iaf_perfctr_value_to_reload_count(pmc_value_t v) > { >- v &= (1ULL << core_iaf_width) - 1; >- return (1ULL << core_iaf_width) - v; >+ /* Sign extend the value and then invert it. */ >+ return -(int64_t)v << (64 - core_iaf_width) >> (64 - core_iaf_width); > } > > static pmc_value_t
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