linux-kernel - Re: [PATCH 2/2] perf docs: Update the documentation for the save

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Message-ID: <e5466ae3-98c9-1e9e-3ddb-bdb0245b6b5c@linux.intel.com>
Date:   Thu, 25 Aug 2022 09:23:23 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     acme@...hat.com, linux-kernel@...r.kernel.org
Cc:     eranian@...gle.com, ak@...ux.intel.com, namhyung@...nel.org,
        irogers@...gle.com, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 2/2] perf docs: Update the documentation for the save_type
 filter

Hi Arnaldo,

The kernel change has been merged into the tip perf/urgent branch.

Do you have any comments for the patch?
If it's OK for you, could you please pull this patch?

Thanks,
Kan

On 2022-08-16 8:56 a.m., kan.liang@...ux.intel.com wrote:
> From: Kan Liang <kan.liang@...ux.intel.com>
> 
> Update the documentation to reflect the kernel changes.
> 
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> ---
>  tools/perf/Documentation/perf-record.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
> index 099817ef5150..d5c57ac1ee0a 100644
> --- a/tools/perf/Documentation/perf-record.txt
> +++ b/tools/perf/Documentation/perf-record.txt
> @@ -397,6 +397,9 @@ following filters are defined:
>  	- abort_tx: only when the target is a hardware transaction abort
>  	- cond: conditional branches
>  	- save_type: save branch type during sampling in case binary is not available later
> +		     For the platforms with Intel Arch LBR support (12th-Gen+ client or
> +		     4th-Gen Xeon+ server), the save branch type is unconditionally enabled
> +		     when the taken branch stack sampling is enabled.
>  
>  +
>  The option requires at least one branch type among any, any_call, any_ret, ind_call, cond.