kern/178385: 'ktrace -t f' (page faults) generates gigabytes of unused data

[Adam Nowacki]

>Number:         178385
>Category:       kern
>Synopsis:       'ktrace -t f' (page faults) generates gigabytes of unused data
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue May 07 05:10:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Adam Nowacki
>Release:        9.1-STABLE
>Organization:
>Environment:
FreeBSD storage 9.1-STABLE FreeBSD 9.1-STABLE #2 r250290M: Mon May  6 16:46:02 UTC 2013     root at storage:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
Tracing page faults with ktrace seems to produce disproportionate amount of data in ktrace.out.
>How-To-Repeat:
$ echo "int main() { return 0; }" | clang -x c -o test -
$ ktrace -t f ./test
-- WARNING: this will take a few minutes and generate ~76GB ktrace.out file
$ kdump
-- outputs a few lines, most of ktrace.out ignored?
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: