Re: [PATCH v8 2/4] perf inject: add jitdump mmap injection support

[Stephane Eranian]

On Fri, Feb 12, 2016 at 12:43 PM, Arnaldo Carvalho de Melo
<acme@xxxxxxxxxx> wrote:
>
> Em Fri, Feb 12, 2016 at 12:32:53PM -0800, Stephane Eranian escreveu:
> > On Thu, Feb 11, 2016 at 2:16 PM, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:
> > > Em Mon, Feb 08, 2016 at 10:53:48AM -0800, Stephane Eranian escreveu:
> > >> > I.e. the MMAP records for the kernel modules comes in ok, humm, because
> > >> > probably you don't hook on PERF_RECORD_MMAP in perf-inject, just on MMAP2, and
> > >> > in those the only difference is the second field, 0x6b98 -> 0x42a0, what is
> > >> > that?
>
> > >> I have both MMAP and MMAP2 hooks for the jit mode of perf inject.
>
> > > IIRC the different in the offsets came from 'perf inject' not preserving
> > > FINISHED_ROUND events.
>
> > That's an oversight. Is there code to repipe this event already?
>
There is a callback for it already. But now, I remember Adrian
suggesting, to change
it to: perf_event__drop_oe(). In fact, if you look at builtin-inject.c
it has a comment about
this.

>
> right, we need to make it test and use what is available, here:
>
> [root@jouet ~]# dnf search alternatives
> Last metadata expiration check performed 1:01:59 ago on Fri Feb 12
> 16:38:51 2016.
> ================================================================= N/S
> Matched: alternatives
> ==================================================================
> galternatives.noarch : Alternatives Configurator
> ghc-base-unicode-symbols.x86_64 : Unicode alternatives for common
> functions and operators
> [root@jouet ~]# rpm -qf `which update-alternatives`
> chkconfig-1.7-1.fc23.x86_64
> [root@jouet ~]# rpm -ql chkconfig | grep alternativ
> /etc/alternatives
> /usr/sbin/alternatives
> /usr/sbin/update-alternatives
> /usr/share/man/man8/alternatives.8.gz
> /usr/share/man/man8/update-alternatives.8.gz
> /var/lib/alternatives


For me on Ubuntu:
$ dpkg -S /usr/sbin/update-java-alternatives
java-common: /usr/sbin/update-java-alternatives

Could you check on Fedora if you do not have that package or its equivalent?