[Bug 200616] pmcstat runs out of buckets

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200616

            Bug ID: 200616
           Summary: pmcstat runs out of buckets
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: hselasky at FreeBSD.org

Hi,

It has been observed that pmcstat can run out of buckets leading to an assert,
when converting trace data into gprof compatible format. Applying the following
patch, temporarily solves the problem:

diff --git a/usr.sbin/pmcstat/pmcpl_gprof.c b/usr.sbin/pmcstat/pmcpl_gprof.c
index 9ff78e8..4a8849f 100644
--- a/usr.sbin/pmcstat/pmcpl_gprof.c
+++ b/usr.sbin/pmcstat/pmcpl_gprof.c
@@ -445,8 +445,8 @@ pmcpl_gmon_process(struct pmcstat_process *pp, struct
pmcstat_pmcrecord *pmcr,
                image, pmcid);
            pgf->pgf_pmcid = pmcid;
            assert(image->pi_end > image->pi_start);
-               pgf->pgf_nbuckets = (image->pi_end - image->pi_start) /
-                   FUNCTION_ALIGNMENT; /* see <machine/profile.h> */
+               pgf->pgf_nbuckets = (image->pi_end - image->pi_start); // /
+       //                  FUNCTION_ALIGNMENT; /* see <machine/profile.h> */
            pgf->pgf_ndatabytes = sizeof(struct gmonhdr) +
                pgf->pgf_nbuckets * sizeof(HISTCOUNTER);
            pgf->pgf_nsamples = 0; 

--HPS

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