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From: Peter Zijlstra <peterz@infradead.org>
To: "Liang, Kan" <kan.liang@linux.intel.com>
Cc: mingo@redhat.com, acme@kernel.org, tglx@linutronix.de,
	bp@alien8.de, x86@kernel.org, linux-kernel@vger.kernel.org,
	mark.rutland@arm.com, alexander.shishkin@linux.intel.com,
	jolsa@redhat.com, namhyung@kernel.org, dave.hansen@intel.com,
	yu-cheng.yu@intel.com, bigeasy@linutronix.de, gorcunov@gmail.com,
	hpa@zytor.com, alexey.budankov@linux.intel.com,
	eranian@google.com, ak@linux.intel.com, like.xu@linux.intel.com,
	yao.jin@linux.intel.com, wei.w.wang@intel.com
Subject: Re: [PATCH V3 13/23] perf/x86/intel/lbr: Factor out intel_pmu_store_lbr
Date: Tue, 7 Jul 2020 09:40:07 +0200	[thread overview]
Message-ID: <20200707074007.GI4800@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <ddfcd90f-ca77-edf4-09b8-183efb2ae2f2@linux.intel.com>

On Mon, Jul 06, 2020 at 06:29:58PM -0400, Liang, Kan wrote:
> On 7/3/2020 4:59 PM, Liang, Kan wrote:
> > On 7/3/2020 3:50 PM, Peter Zijlstra wrote:

> > > If I'm not mistaken, this correctly deals with LBR_FORMAT_INFO, so can't
> > > we also use the intel_pmu_arch_lbr_read() function for that case?
> > 
> 
> There is another more severe issue which prevents sharing the read of Arch
> LBR with LBR_FORMAT_INFO. Sorry I missed it.

No worries, I too missed it.

> For the legacy LBR, the youngest branch is stored in TOS MSR. The next
> youngest is in (TOS - 1)...
> 
> For Arch LBR and LBR PEBS, the youngest branch is always in entry 0. The
> next youngest is in entry 1...
> 
> The growth of the legacy LBR is in a reversed order of Arch LBR and LBR
> PEBS. The legacy LBR also relies on TOS. I'm afraid we cannot use the
> intel_pmu_arch_lbr_read() function for LBR_FORMAT_INFO.
> 
> I think I will only send a patch to support NO_{CYCLES,FLAGS} for all LBR
> formats.

Thanks!

  reply	other threads:[~2020-07-07  7:40 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-03 12:49 [PATCH V3 00/23] Support Architectural LBR kan.liang
2020-07-03 12:49 ` [PATCH V3 01/23] x86/cpufeatures: Add Architectural LBRs feature bit kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-09 23:00     ` Dave Hansen
2020-07-10  9:51       ` Peter Zijlstra
2020-07-10 14:09       ` Liang, Kan
2020-07-03 12:49 ` [PATCH V3 02/23] perf/x86/intel/lbr: Add a function pointer for LBR reset kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 03/23] perf/x86/intel/lbr: Add a function pointer for LBR read kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 04/23] perf/x86/intel/lbr: Add the function pointers for LBR save and restore kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 05/23] perf/x86/intel/lbr: Factor out a new struct for generic optimization kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 06/23] perf/x86/intel/lbr: Use dynamic data structure for task_ctx kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 07/23] x86/msr-index: Add bunch of MSRs for Arch LBR kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 08/23] perf/x86: Expose CPUID enumeration bits for arch LBR kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 09/23] perf/x86/intel/lbr: Support LBR_CTL kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 10/23] perf/x86/intel/lbr: Unify the stored format of LBR information kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 11/23] perf/x86/intel/lbr: Mark the {rd,wr}lbr_{to,from} wrappers __always_inline kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 12/23] perf/x86/intel/lbr: Factor out rdlbr_all() and wrlbr_all() kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 13/23] perf/x86/intel/lbr: Factor out intel_pmu_store_lbr kan.liang
2020-07-03 19:50   ` Peter Zijlstra
2020-07-03 20:59     ` Liang, Kan
2020-07-06 10:25       ` Peter Zijlstra
2020-07-06 13:32         ` Liang, Kan
2020-07-06 14:25           ` Peter Zijlstra
2020-07-06 22:29       ` Liang, Kan
2020-07-07  7:40         ` Peter Zijlstra [this message]
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 14/23] perf/x86/intel/lbr: Support Architectural LBR kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 15/23] perf/core: Factor out functions to allocate/free the task_ctx_data kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 16/23] perf/core: Use kmem_cache to allocate the PMU specific data kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 17/23] perf/x86/intel/lbr: Create kmem_cache for the LBR context data kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 18/23] perf/x86: Remove task_ctx_size kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 19/23] x86/fpu: Use proper mask to replace full instruction mask kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 20/23] x86/fpu/xstate: Support dynamic supervisor feature for LBR kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2021-05-27 22:15     ` Thomas Gleixner
2020-07-03 12:49 ` [PATCH V3 21/23] x86/fpu/xstate: Add helpers for LBR dynamic supervisor feature kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 22/23] perf/x86/intel/lbr: Support XSAVES/XRSTORS for LBR context switch kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 12:49 ` [PATCH V3 23/23] perf/x86/intel/lbr: Support XSAVES for arch LBR read kan.liang
2020-07-08  9:51   ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-07-03 19:34 ` [PATCH V3 00/23] Support Architectural LBR Peter Zijlstra

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