Date: Thu, 28 Feb 2019 17:39:43 -0800 From: Matthew Macy <mmacy@freebsd.org> To: Alan Somers <asomers@freebsd.org> Cc: src-committers <src-committers@freebsd.org>, svn-src-all <svn-src-all@freebsd.org>, svn-src-head <svn-src-head@freebsd.org> Subject: Re: svn commit: r344487 - in head/sys: conf gnu/gcov Message-ID: <CAPrugNrnKeDkqsqDtPyTCsPBK6rUsAThog1KO1u3FPCGihD3sw@mail.gmail.com> In-Reply-To: <CAOtMX2hD=o%2BF1z1sErDuBxaL8qm%2BS-BDAwvLr=1z0MhmAJ8ang@mail.gmail.com> References: <201902232114.x1NLE0cH085345@repo.freebsd.org> <CAOtMX2hD=o%2BF1z1sErDuBxaL8qm%2BS-BDAwvLr=1z0MhmAJ8ang@mail.gmail.com>
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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@freebsd.org> wrote: > > On Sat, Feb 23, 2019 at 2:14 PM Matt Macy <mmacy@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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