linux-kernel - Re: [PATCH v2 08/19] perf, tools: Expression parser enhancements for metrics

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Date:   Tue, 22 Aug 2017 10:45:18 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v2 08/19] perf, tools: Expression parser enhancements for
 metrics

On Fri, Aug 11, 2017 at 04:26:23PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Enhance the expression parser for more complex metric formulas.
> 
> - Support python style IF ELSE operators
> - Add an #SMT_On magic variable for formulas that depend on the SMT
> status.
> 
> Example: 4 *( CPU_CLK_UNHALTED.THREAD_ANY / 2 ) if #SMT_on else cycles
> 
> - Support MIN/MAX operations
> 
> Example: min(1 , IDQ.MITE_UOPS / ( UPI * 16 * ( ICACHE.HIT + ICACHE.MISSES ) / 4.0 ) )
> 
> This is useful to fix up problems caused by multiplexing.
> 
> - Support | & ^ operators
> - Minor cleanups and fixes
> - Support an \ escape for operators. This allows to specify event names
> like c2-residency
> - Support @ as an alternative for / to be able to specify pmus without
> conflicts with operators (like msr/tsc/ as msr@tsc@)
> 
> Example: (cstate_core@c3\\-residency@ / msr@tsc@) * 100
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka