linux-kernel - [tip: perf/core] perf expr: Increase EXPR_MAX_OTHER to support metrics with more than 15 variables

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Thu, 19 Mar 2020 14:10:51 -0000
From:   "tip-bot2 for Jiri Olsa" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Jiri Olsa <jolsa@...nel.org>, Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: perf/core] perf expr: Increase EXPR_MAX_OTHER to support
 metrics with more than 15 variables

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     58ca707636dc44c8803a098fb68129f64272f151
Gitweb:        https://git.kernel.org/tip/58ca707636dc44c8803a098fb68129f64272f151
Author:        Jiri Olsa <jolsa@...nel.org>
AuthorDate:    Fri, 28 Feb 2020 10:36:14 +01:00
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Mon, 09 Mar 2020 21:43:24 -03:00

perf expr: Increase EXPR_MAX_OTHER to support metrics with more than 15 variables

We have metrics that define more than 15 variables, like
Branch_Misprediction_Cost. Increasing the allowed variables count to 20.

As Andy pointed out, we can't go too high in here, because some of the
code has O(n^2) complexity (already_seen) and we might want to do some
other changes (like using hash tables) before increasing the maximum
even more.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: John Garry <john.garry@...wei.com>
Cc: Kajol Jain <kjain@...ux.ibm.com>
Cc: Michael Petlan <mpetlan@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Link: http://lore.kernel.org/lkml/20200228093616.67125-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/expr.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
index 9332796..df0a17d 100644
--- a/tools/perf/util/expr.h
+++ b/tools/perf/util/expr.h
@@ -2,7 +2,7 @@
 #ifndef PARSE_CTX_H
 #define PARSE_CTX_H 1
 
-#define EXPR_MAX_OTHER 15
+#define EXPR_MAX_OTHER 20
 #define MAX_PARSE_ID EXPR_MAX_OTHER
 
 struct parse_id {