linux-kernel - Re: [PATCH 1/9] perf/core: Add PERF_RECORD

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Date:   Fri, 30 Aug 2019 12:56:02 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 1/9] perf/core: Add PERF_RECORD_CGROUP event

Hi Tejun,

On Wed, Aug 28, 2019 at 11:48 PM Tejun Heo <tj@...nel.org> wrote:
>
> Hello, Namhyung.
>
> On Wed, Aug 28, 2019 at 04:31:22PM +0900, Namhyung Kim wrote:
> > +      * struct {
> > +      *      struct perf_event_header        header;
> > +      *      u64                             ino;
> > +      *      u64                             path_len;
> > +      *      char                            path[];
>
> ino and path aren't great identifers for cgroups because both can get
> recycled pretty quickly.  Can you please take a look at
> KERNFS_ROOT_SUPPORT_EXPORTOP?  That's the fhandle that cgroup uses,
> currently the standard ino+gen which isn't ideal but good enough.
> Another benefit is that the path can also be resolved efficiently from
> userspace given the handle.

Thanks for the info, I'll take a look at it.
Namhyung