linux-kernel - Re: [RFC 1/2] perf core: Add PERF_COUNT_SW_CGROUP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CABPqkBRsS2+gT-792uYq+U84LJepDjY=wwiLku6mtVhgd8mEEA@mail.gmail.com>
Date:   Wed, 2 Dec 2020 15:40:42 -0800
From:   Stephane Eranian <eranian@...gle.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [RFC 1/2] perf core: Add PERF_COUNT_SW_CGROUP_SWITCHES event

On Wed, Dec 2, 2020 at 2:42 PM Andi Kleen <ak@...ux.intel.com> wrote:
>
> On Wed, Dec 02, 2020 at 11:47:25AM -0800, Stephane Eranian wrote:
> > On Wed, Dec 2, 2020 at 11:28 AM Andi Kleen <ak@...ux.intel.com> wrote:
> > >
> > > > +     prev_cgrp = task_css_check(prev, perf_event_cgrp_id, 1)->cgroup;
> > > > +     next_cgrp = task_css_check(next, perf_event_cgrp_id, 1)->cgroup;
> > > > +
> > > > +     if (prev_cgrp != next_cgrp)
> > > > +             perf_sw_event_sched(PERF_COUNT_SW_CGROUP_SWITCHES, 1, 0);
> > >
> > > Seems to be the perf cgroup only, not all cgroups.
> > > That's a big difference and needs to be documented properly.
> > >
> > We care about the all-cgroup case.
>
> Then it's not correct I think. You need a different hook point.
>
I realize that ;-(