svn commit: r344487 - in head/sys: conf gnu/gcov
Matthew Macy
mmacy at freebsd.org
Fri Mar 1 01:39:56 UTC 2019
to config add:
options LINDEBUGFS
options GCOV
compile kernel with gcc (otherwise it will be a no-op)
sysctl debug.gcov.enable=1
mount -t debugfs debugfs /sys/kernel/debug
(or wherever) and the output artifacts will appear under gcov/<kernel
build path> - you need to be root to see the artifacts
gcov can then generate the results as it would normally from the
profiling and the build time artifacts
bug reports welcome
-M
On Thu, Feb 28, 2019 at 2:50 PM Alan Somers <asomers at freebsd.org> wrote:
>
> On Sat, Feb 23, 2019 at 2:14 PM Matt Macy <mmacy at freebsd.org> wrote:
> >
> > Author: mmacy
> > Date: Sat Feb 23 21:14:00 2019
> > New Revision: 344487
> > URL: https://svnweb.freebsd.org/changeset/base/344487
> >
> > Log:
> > gcov support
> >
> > add gcov support and export results as files in debugfs
> >
> > Reviewed by: hps@
> > MFC after: 1 week
> > Sponsored by: iX Systems
> > Differential Revision: https://reviews.freebsd.org/D19260
> >
> > Added:
> > head/sys/gnu/gcov/
> > head/sys/gnu/gcov/gcc_4_7.c (contents, props changed)
> > head/sys/gnu/gcov/gcov.h (contents, props changed)
> > head/sys/gnu/gcov/gcov_fs.c (contents, props changed)
> > head/sys/gnu/gcov/gcov_subr.c (contents, props changed)
> > Modified:
> > head/sys/conf/files
> > head/sys/conf/kern.mk
> > head/sys/conf/kern.post.mk
> > head/sys/conf/kern.pre.mk
> > head/sys/conf/kmod.mk
> > head/sys/conf/options
>
> On a more practical note, how does one use this new feature? It looks
> like it could be quite useful.
> -Alan
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