linux-kernel - [tip:perfcounters/core] perf_counter tools: increase limits, fix

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Date:	Mon, 25 May 2009 08:03:32 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, jkacur@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter tools: increase limits, fix

Commit-ID:  85a9f9200226ddffc2ea50dae6a8df04c033ecd4
Gitweb:     http://git.kernel.org/tip/85a9f9200226ddffc2ea50dae6a8df04c033ecd4
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Mon, 25 May 2009 09:59:50 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 25 May 2009 09:59:50 +0200

perf_counter tools: increase limits, fix

NR_CPUS and NR_COUNTERS goes up quadratic ... 1024x4096 was far
too ambitious upper limit - go for 256x256 which is still plenty.

[ Impact: reduce perf tool memory consumption ]

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: John Kacur <jkacur@...hat.com>
Cc: Mike Galbraith <efault@....de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 Documentation/perf_counter/perf.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/perf_counter/perf.h b/Documentation/perf_counter/perf.h
index a517683..5a2520b 100644
--- a/Documentation/perf_counter/perf.h
+++ b/Documentation/perf_counter/perf.h
@@ -61,8 +61,8 @@ sys_perf_counter_open(struct perf_counter_hw_event *hw_event_uptr,
 		       group_fd, flags);
 }
 
-#define MAX_COUNTERS			1024
-#define MAX_NR_CPUS			4096
+#define MAX_COUNTERS			256
+#define MAX_NR_CPUS			256
 
 #define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id))
 
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