linux-kernel - Re: linux-2.6.28-rc2 regression : oprofile doesnt work anymore ?

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

Date:	Tue, 4 Nov 2008 21:19:48 +0200 (EET)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	Robert Richter <robert.richter@....com>
cc:	Andi Kleen <andi@...stfloor.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: linux-2.6.28-rc2 regression : oprofile doesnt work anymore ?

Hi Robert,

On Tue, 4 Nov 2008, Robert Richter wrote:
> your patchset breaks oprofile on Intel Core 2 cpus. I could bisect the
> bug for c493756..5951290. Please take a look at this and send me a fix.

Unfortunately I don't have my machine with me right now so I can't test 
this, but don't we want something like this? Andi?

		Pekka

>From 37d362c0262006be6a5d6a72b5993834afa776d7 Mon Sep 17 00:00:00 2001
From: Pekka Enberg <penberg@...helsinki.fi>
Date: Tue, 4 Nov 2008 21:17:47 +0200
Subject: [PATCH] oprofile: make perfmon nethalem only

Commit b99170288421c79f0c2efa8b33e26e65f4bb7fb8 ("oprofile: Implement Intel
architectural perfmon support") added perfmon support to newer Intel CPUs
(Core1+). The problem there is that it requires a patched oprofile userland to
work properly.

Fix that up by making oprofile perfmon support nethalem only.

Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 arch/x86/oprofile/nmi_int.c       |    7 +++++++
 arch/x86/oprofile/op_model_ppro.c |    4 +++-
 2 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 022cd41..1f4448e 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -426,8 +426,15 @@ static int __init ppro_init(char **cpu_type)
 
 static int __init arch_perfmon_init(char **cpu_type)
 {
+	__u8 cpu_model = boot_cpu_data.x86_model;
+
 	if (!cpu_has_arch_perfmon)
 		return 0;
+
+	/* Nethalem only */
+	if (cpu_model != 26)
+		return 0;
+
 	*cpu_type = "i386/arch_perfmon";
 	model = &op_arch_perfmon_spec;
 	arch_perfmon_setup_counters();
diff --git a/arch/x86/oprofile/op_model_ppro.c b/arch/x86/oprofile/op_model_ppro.c
index 0620d6d..1c91ba2 100644
--- a/arch/x86/oprofile/op_model_ppro.c
+++ b/arch/x86/oprofile/op_model_ppro.c
@@ -66,6 +66,7 @@ static void ppro_fill_in_addresses(struct op_msrs * const msrs)
 
 static void ppro_setup_ctrs(struct op_msrs const * const msrs)
 {
+	__u8 cpu_model = boot_cpu_data.x86_model;
 	unsigned int low, high;
 	int i;
 
@@ -76,7 +77,8 @@ static void ppro_setup_ctrs(struct op_msrs const * const msrs)
 			return;
 	}
 
-	if (cpu_has_arch_perfmon) {
+	/* Nethalem only */
+	if (cpu_has_arch_perfmon && cpu_model == 26) {
 		union cpuid10_eax eax;
 		eax.full = cpuid_eax(0xa);
 		if (counter_width < eax.split.bit_width)
-- 
1.5.3.7

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/