linux-kernel - Re: [PATCH V2 0/6] Add sample_flags to improve the perf_sample

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: <CAM9d7cgGPE7q9xhdxQtgv94i+SF-3+T2txdnY8m2P0qsSVWnkQ@mail.gmail.com>
Date:   Thu, 1 Sep 2022 22:32:55 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Kan Liang <kan.liang@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Stephane Eranian <eranian@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>, andreas.kogler.0x@...il.com,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: [PATCH V2 0/6] Add sample_flags to improve the perf_sample_data struct

On Thu, Sep 1, 2022 at 6:10 AM <kan.liang@...ux.intel.com> wrote:
>
> From: Kan Liang <kan.liang@...ux.intel.com>
>
> Changes since V1:
> - Update the AMD LBR code in patch 3
>
> The patch series is to fix PEBS timestamps overwritten and improve the
> perf_sample_data struct. The detailed discussion can be found at
> https://lore.kernel.org/lkml/YwXvGe4%2FQdgGYOKJ@worktop.programming.kicks-ass.net/
>
> The patch series has two changes compared with the suggestions in the
> above discussion.
> - Only clear the sample flags for the perf_prepare_sample().
>   The __perf_event_header__init_id is shared between perf_prepare_sample()
>   (used by PERF_RECORD_SAMPLE) and perf_event_header__init_id() (used by
>   other PERF_RECORD_* event type). The sample data is only available
>   for the PERF_RECORD_SAMPLE.
> - The CALLCHAIN_EARLY hack is still required for the BPF, especially
>   perf_event_set_bpf_handler(). The sample data is not available when
>   the function is invoked.
>
> Kan Liang (6):
>   perf: Add sample_flags to indicate the PMU-filled sample data
>   perf/x86/intel/pebs: Fix PEBS timestamps overwritten
>   perf: Use sample_flags for branch stack
>   perf: Use sample_flags for weight
>   perf: Use sample_flags for data_src
>   perf: Use sample_flags for txn

Maybe we can get rid of perf_sample_data_init() completely.
But it could be done later, so

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


>
>  arch/powerpc/perf/core-book3s.c | 10 ++++++---
>  arch/x86/events/amd/core.c      |  4 +++-
>  arch/x86/events/core.c          |  4 +++-
>  arch/x86/events/intel/core.c    |  4 +++-
>  arch/x86/events/intel/ds.c      | 39 ++++++++++++++++++++++++---------
>  include/linux/perf_event.h      | 15 ++++++-------
>  kernel/events/core.c            | 30 ++++++++++++++++++-------
>  7 files changed, 74 insertions(+), 32 deletions(-)
>
> --
> 2.35.1
>