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From: Andi Kleen <ak@linux.intel.com>
To: Jiri Olsa <jolsa@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Michael Petlan <mpetlan@redhat.com>,
	Ravi Bangoria <ravi.bangoria@linux.ibm.com>,
	Kajol Jain <kjain@linux.ibm.com>,
	John Garry <john.garry@huawei.com>
Subject: Re: [PATCH 3/5] perf expr: Increase EXPR_MAX_OTHER
Date: Mon, 24 Feb 2020 13:03:08 -0800
Message-ID: <20200224210308.GQ160988@tassilo.jf.intel.com> (raw)
In-Reply-To: <20200224082918.58489-4-jolsa@kernel.org>

On Mon, Feb 24, 2020 at 09:29:16AM +0100, Jiri Olsa wrote:
> There's no need to be greedy on allowed variables, also
> when some of the metrics define more than 15 variables,
> like Branch_Misprediction_Cost.
> 
> Increasing the maximum to 100.

FWIW some of the algorithms (e.g. already_seen) have O(n^2) complexity.

If you really want that many probably would need to add some hash tables.

-Andi

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24  8:29 [PATCHv2 0/5] perf expr: Add flex scanner Jiri Olsa
2020-02-24  8:29 ` [PATCH 1/5] perf expr: Add expr.c object Jiri Olsa
2020-02-24  8:29 ` [PATCH 2/5] perf expr: Move expr lexer to flex Jiri Olsa
2020-02-24  8:29 ` [PATCH 3/5] perf expr: Increase EXPR_MAX_OTHER Jiri Olsa
2020-02-24 21:03   ` Andi Kleen [this message]
2020-02-24  8:29 ` [PATCH 4/5] perf expr: Straighten expr__parse/expr__find_other interface Jiri Olsa
2020-02-24  8:29 ` [PATCH 5/5] perf expr: Make expr__parse return -1 on error Jiri Olsa
2020-02-27 12:10 ` [PATCHv2 0/5] perf expr: Add flex scanner Jiri Olsa
2020-02-27 13:46   ` Arnaldo Carvalho de Melo
2020-02-28  9:36 [PATCHv3 " Jiri Olsa
2020-02-28  9:36 ` [PATCH 3/5] perf expr: Increase EXPR_MAX_OTHER Jiri Olsa

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