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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: Mon, 6 Jul 2020 12:25:57 +0200	[thread overview]
Message-ID: <20200706102557.GA597537@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <bf63dee4-d25f-89d8-1893-572d84cfa667@linux.intel.com>

On Fri, Jul 03, 2020 at 04:59:49PM -0400, 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?
> 
> But the intel_pmu_arch_lbr_read() doesn't have the optimization
> (LBR_NO_INFO) for the LBR_FORMAT_INFO.
> https://lkml.kernel.org/r/tip-b16a5b52eb90d92b597257778e51e1fdc6423e64@git.kernel.org
> 
> To apply the optimization, we need extra codes as below.

Right, I saw that, but shouldn't we support that for anything with this
format anyway? That is, it's weird and inconsistent to not support
PERF_SAMPLE_BRANCH_NO_{CYCLES,FLAGS} for PEBS/ARCH-LBR output.

Arguably, we should even support NO_CYCLES for FORMAT_TIME. Yes it's
daft, but that's what you get for adding the ABI.


  reply	other threads:[~2020-07-06 10:26 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 [this message]
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
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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