linux-kernel - Re: [PATCH 2/6] perf: Support branch events logging

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Message-ID: <20230414160945.GC761523@hirez.programming.kicks-ass.net>
Date:   Fri, 14 Apr 2023 18:09:45 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     mingo@...hat.com, acme@...nel.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org, irogers@...gle.com,
        adrian.hunter@...el.com, ak@...ux.intel.com, eranian@...gle.com
Subject: Re: [PATCH 2/6] perf: Support branch events logging

On Fri, Apr 14, 2023 at 11:56:41AM -0400, Liang, Kan wrote:
> > If it were to only support 4, then
> > we're in counter scheduling contraint hell again 
> 
> Unfortunately, yes.
> 
> > and we need to somehow
> > group all these things together with the LBR event.
> 
> Group will bring many limits for the usage. For example, I was told
> there could be someone wants to use it with multiplexing.

You can create two groups, each with an LBR event, no?