linux-kernel - Re: [PATCH V3 2/6] perf/x86/intel/uncore: Add alias PMU name

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Message-ID: <YNw76ZUUUG+qUyP2@kroah.com>
Date:   Wed, 30 Jun 2021 11:39:53 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     kan.liang@...ux.intel.com
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org, eranian@...gle.com,
        namhyung@...nel.org, jolsa@...hat.com, ak@...ux.intel.com,
        yao.jin@...ux.intel.com
Subject: Re: [PATCH V3 2/6] perf/x86/intel/uncore: Add alias PMU name

On Tue, Jun 29, 2021 at 11:13:59AM -0700, kan.liang@...ux.intel.com wrote:
> From: Kan Liang <kan.liang@...ux.intel.com>
> 
> A perf PMU may have two PMU names. For example, Intel Sapphire Rapids
> server supports the discovery mechanism. Without the platform-specific
> support, an uncore PMU is named by a type ID plus a box ID, e.g.,
> uncore_type_0_0, because the real name of the uncore PMU cannot be
> retrieved from the discovery table. With the platform-specific support
> later, perf has the mapping information from a type ID to a specific
> uncore unit. Just like the previous platforms, the uncore PMU is named
> by the real PMU name, e.g., uncore_cha_0. The user scripts which work
> well with the old numeric name may not work anymore.
> 
> Add a new attribute "alias" to indicate the old numeric name. The
> following userspace perf tool patch will handle both names. The user
> scripts should work properly with the updated perf tool.
> 
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> Cc: gregkh@...uxfoundation.org
> ---
>  arch/x86/events/intel/uncore.c       | 19 +++++++++++++------
>  arch/x86/events/intel/uncore.h       |  1 +
>  arch/x86/events/intel/uncore_snbep.c | 28 +++++++++++++++++++++++++++-
>  3 files changed, 41 insertions(+), 7 deletions(-)

No Documentation/ABI/ update for your new sysfs file?

:(