linux-kernel - Re: [PATCH] perf record: Add support to collect callchains from kernel or user space only.

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Date:   Thu, 6 Jun 2019 15:15:04 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     ufo19890607 <ufo19890607@...il.com>, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, dsahern@...il.com, namhyung@...nel.org,
        milian.wolff@...b.com, arnaldo.melo@...il.com,
        yuzhoujian@...ichuxing.com, adrian.hunter@...el.com,
        wangnan0@...wei.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, acme@...hat.com
Subject: Re: [PATCH] perf record: Add support to collect callchains from
 kernel or user space only.

Em Thu, Jun 06, 2019 at 04:46:14PM +0200, Jiri Olsa escreveu:
> On Thu, Jun 06, 2019 at 11:26:44AM -0300, Arnaldo Carvalho de Melo wrote:
> > So that the user don't try using:

> >     pref record --user-callchains --kernel-callchains

> > expecting to get both user and kernel callchains and instead gets
> > nothing.
 
> good catch.. we should add the logic to keep both (default)
> in this case.. so do nothing ;-)

Yeah, not using both or using both should amount to the same behaviour.

Can be done with a patch on top of what I have in my tree now.

- Arnaldo