Berthier, Emmanuel; Tejun Heo
>> Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
>>
>> On Sun, Dec 7, 2014 at 10:40 AM, Robert Jarzmik
>> wrote:
>> > Hi Andy,
>> >
>> > Andy Lutomirski writes:
>> >> On Dec 6, 2014 2:31 AM, "R
> From: Andy Lutomirski [mailto:l...@amacapital.net]
> Sent: Sunday, December 7, 2014 8:10 PM
> To: Jarzmik, Robert
> Cc: linux-kernel@vger.kernel.org; H. Peter Anvin; X86 ML; Thomas Gleixner;
> Berthier, Emmanuel; Tejun Heo
> Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
From: Andy Lutomirski [mailto:l...@amacapital.net]
Sent: Sunday, December 7, 2014 8:10 PM
To: Jarzmik, Robert
Cc: linux-kernel@vger.kernel.org; H. Peter Anvin; X86 ML; Thomas Gleixner;
Berthier, Emmanuel; Tejun Heo
Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
On Sun, Dec 7, 2014
; Tejun Heo
Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
On Sun, Dec 7, 2014 at 10:40 AM, Robert Jarzmik robert.jarz...@intel.com
wrote:
Hi Andy,
Andy Lutomirski l...@amacapital.net writes:
On Dec 6, 2014 2:31 AM, Robert Jarzmik robert.jarz...@intel.com
wrote:
We would have a LBR
On Sun, Dec 7, 2014 at 10:40 AM, Robert Jarzmik
wrote:
> Hi Andy,
>
> Andy Lutomirski writes:
>> On Dec 6, 2014 2:31 AM, "Robert Jarzmik" wrote:
>>> We would have a "LBR resource" variable to track who owns the LBR :
>>> - nobody : LBR_UNCLAIMED
>>> - the exception handler :
Hi Andy,
Andy Lutomirski writes:
> On Dec 6, 2014 2:31 AM, "Robert Jarzmik" wrote:
>> We would have a "LBR resource" variable to track who owns the LBR :
>> - nobody : LBR_UNCLAIMED
>> - the exception handler : LBR_EXCEPTION_DEBUG_USAGE
>
> Which exception handler? There can be several on the
Hi Andy,
Andy Lutomirski l...@amacapital.net writes:
On Dec 6, 2014 2:31 AM, Robert Jarzmik robert.jarz...@intel.com wrote:
We would have a LBR resource variable to track who owns the LBR :
- nobody : LBR_UNCLAIMED
- the exception handler : LBR_EXCEPTION_DEBUG_USAGE
Which exception handler?
On Sun, Dec 7, 2014 at 10:40 AM, Robert Jarzmik
robert.jarz...@intel.com wrote:
Hi Andy,
Andy Lutomirski l...@amacapital.net writes:
On Dec 6, 2014 2:31 AM, Robert Jarzmik robert.jarz...@intel.com wrote:
We would have a LBR resource variable to track who owns the LBR :
- nobody :
Andy Lutomirski writes:
> I don't really care about the number of instructions.
Right, a couple of test/jz/jnz is negligible in the exception path, that's what
I also think.
> But there are still all the nasty cases:
>
> - Context switch during exception processing (both in the C handler
>
Andy Lutomirski l...@amacapital.net writes:
I don't really care about the number of instructions.
Right, a couple of test/jz/jnz is negligible in the exception path, that's what
I also think.
But there are still all the nasty cases:
- Context switch during exception processing (both in the
> From: Andy Lutomirski [mailto:l...@amacapital.net]
> Sent: Thursday, December 4, 2014 7:10 PM
> To: Berthier, Emmanuel
> Cc: Thomas Gleixner; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
> Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
> >> And the general problem
From: Andy Lutomirski [mailto:l...@amacapital.net]
Sent: Thursday, December 4, 2014 7:10 PM
To: Berthier, Emmanuel
Cc: Thomas Gleixner; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
And the general problem with this approach (even
On Thu, Dec 4, 2014 at 8:01 AM, Berthier, Emmanuel
wrote:
>> From: Andy Lutomirski [mailto:l...@amacapital.net]
>> Sent: Wednesday, December 3, 2014 8:30 PM
>> To: Berthier, Emmanuel
>> Cc: Thomas Gleixner; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
>> Subject:
> From: Andy Lutomirski [mailto:l...@amacapital.net]
> Sent: Wednesday, December 3, 2014 8:30 PM
> To: Berthier, Emmanuel
> Cc: Thomas Gleixner; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
> Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
> > The final patch will bypass
From: Andy Lutomirski [mailto:l...@amacapital.net]
Sent: Wednesday, December 3, 2014 8:30 PM
To: Berthier, Emmanuel
Cc: Thomas Gleixner; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
The final patch will bypass the new code in case
] [LBR] Dump LBRs on Exception
The final patch will bypass the new code in case of UserSpace page fault,
so
performance impact will be very low.
LBRs copy takes much more time than LBR stop/start.
The simple is the better:
.macro STOP_LBR
#ifdef CONFIG_LBR_DUMP_ON_EXCEPTION
On Wed, Dec 3, 2014 at 10:25 AM, Berthier, Emmanuel
wrote:
>> From: Andy Lutomirski [mailto:l...@amacapital.net]
>> Sent: Tuesday, December 2, 2014 9:12 PM
>> To: Thomas Gleixner
>> Cc: Berthier, Emmanuel; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
>> Subject:
> From: Andy Lutomirski [mailto:l...@amacapital.net]
> Sent: Tuesday, December 2, 2014 9:12 PM
> To: Thomas Gleixner
> Cc: Berthier, Emmanuel; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
> Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
>
> On Tue, Dec 2, 2014 at 11:5
From: Andy Lutomirski [mailto:l...@amacapital.net]
Sent: Tuesday, December 2, 2014 9:12 PM
To: Thomas Gleixner
Cc: Berthier, Emmanuel; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
On Tue, Dec 2, 2014 at 11:56 AM, Thomas Gleixner t
] [LBR] Dump LBRs on Exception
On Tue, Dec 2, 2014 at 11:56 AM, Thomas Gleixner t...@linutronix.de
wrote:
On Tue, 2 Dec 2014, Andy Lutomirski wrote:
TBH, I'm wondering whether this is actually a good idea. It might be
more valuable and less scary to try to make this work for BUG instead
On Tue, Dec 2, 2014 at 11:56 AM, Thomas Gleixner wrote:
> On Tue, 2 Dec 2014, Andy Lutomirski wrote:
>> TBH, I'm wondering whether this is actually a good idea. It might be
>> more valuable and less scary to try to make this work for BUG instead.
>> To get the most impact, it might be worth
On Tue, 2 Dec 2014, Andy Lutomirski wrote:
> TBH, I'm wondering whether this is actually a good idea. It might be
> more valuable and less scary to try to make this work for BUG instead.
> To get the most impact, it might be worth allocating a new exception
> vector for BUG and using 'int
> From: Andy Lutomirski [mailto:l...@amacapital.net]
> Sent: Friday, November 28, 2014 4:15 PM
> To: Berthier, Emmanuel
> Cc: Thomas Gleixner; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
> Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
>
> On Fri, Nov 28, 2014
On Tue, Dec 2, 2014 at 11:09 AM, Berthier, Emmanuel
wrote:
>> From: Andy Lutomirski [mailto:l...@amacapital.net]
>> Sent: Friday, November 28, 2014 4:15 PM
>> To: Berthier, Emmanuel
>> Cc: Thomas Gleixner; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
>> Subject:
] [LBR] Dump LBRs on Exception
On Fri, Nov 28, 2014 at 12:44 AM, Berthier, Emmanuel
emmanuel.berth...@intel.com wrote:
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index df088bb..f39cded 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
From: Andy Lutomirski [mailto:l...@amacapital.net]
Sent: Friday, November 28, 2014 4:15 PM
To: Berthier, Emmanuel
Cc: Thomas Gleixner; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
On Fri, Nov 28, 2014 at 12:44 AM, Berthier, Emmanuel
On Tue, 2 Dec 2014, Andy Lutomirski wrote:
TBH, I'm wondering whether this is actually a good idea. It might be
more valuable and less scary to try to make this work for BUG instead.
To get the most impact, it might be worth allocating a new exception
vector for BUG and using 'int
On Tue, Dec 2, 2014 at 11:56 AM, Thomas Gleixner t...@linutronix.de wrote:
On Tue, 2 Dec 2014, Andy Lutomirski wrote:
TBH, I'm wondering whether this is actually a good idea. It might be
more valuable and less scary to try to make this work for BUG instead.
To get the most impact, it might be
rzmik, Robert; LKML
>> Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
>>
>> On Thu, Nov 27, 2014 at 1:22 PM, Thomas Gleixner
>> wrote:
>> >> /*
>> >> * Exception entry points.
>> >> */
>> >> @@ -1063,6 +110
> From: Thomas Gleixner [mailto:t...@linutronix.de]
> Sent: Thursday, November 27, 2014 10:23 PM
> To: Berthier, Emmanuel
> Cc: H. Peter Anvin; x...@kernel.org; Jarzmik, Robert; LKML; Andy Lutomirski
> Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
>
> On Thu, 27 Nov 20
> -Original Message-
> From: Andy Lutomirski [mailto:l...@amacapital.net]
> Sent: Thursday, November 27, 2014 10:56 PM
> To: Thomas Gleixner
> Cc: Berthier, Emmanuel; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
> Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
&
-Original Message-
From: Andy Lutomirski [mailto:l...@amacapital.net]
Sent: Thursday, November 27, 2014 10:56 PM
To: Thomas Gleixner
Cc: Berthier, Emmanuel; H. Peter Anvin; X86 ML; Jarzmik, Robert; LKML
Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
On Thu, Nov 27, 2014 at 1
From: Thomas Gleixner [mailto:t...@linutronix.de]
Sent: Thursday, November 27, 2014 10:23 PM
To: Berthier, Emmanuel
Cc: H. Peter Anvin; x...@kernel.org; Jarzmik, Robert; LKML; Andy Lutomirski
Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
On Thu, 27 Nov 2014, Emmanuel Berthier wrote
; LKML
Subject: Re: [PATCH v2] [LBR] Dump LBRs on Exception
On Thu, Nov 27, 2014 at 1:22 PM, Thomas Gleixner t...@linutronix.de
wrote:
/*
* Exception entry points.
*/
@@ -1063,6 +1103,8 @@ ENTRY(\sym)
subq $ORIG_RAX-R15, %rsp
CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
On Thu, Nov 27, 2014 at 1:22 PM, Thomas Gleixner wrote:
> On Thu, 27 Nov 2014, Emmanuel Berthier wrote:
>> diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
>> b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
>> index 45fa730..0a69365 100644
>> --- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
On Thu, 27 Nov 2014, Emmanuel Berthier wrote:
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
> b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
> index 45fa730..0a69365 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
> @@ -4,7
On Thu, 27 Nov 2014, Emmanuel Berthier wrote:
diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
index 45fa730..0a69365 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
@@ -4,7 +4,7 @@
On Thu, Nov 27, 2014 at 1:22 PM, Thomas Gleixner t...@linutronix.de wrote:
On Thu, 27 Nov 2014, Emmanuel Berthier wrote:
diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
index 45fa730..0a69365 100644
---
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