linux-kernel - Re: [PATCH V5 0/8] perf: Expand perf_branch

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Message-ID: <f469f253-9ccc-d55b-731d-3ecc8d685104@arm.com>
Date:   Mon, 11 Apr 2022 11:16:02 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        peterz@...radead.org, acme@...nel.org
Cc:     Robin Murphy <robin.murphy@....com>,
        Suzuki Poulose <suzuki.poulose@....com>,
        James Clark <james.clark@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V5 0/8] perf: Expand perf_branch_entry



On 4/4/22 10:20, Anshuman Khandual wrote:
> Branch Record Buffer Extension (BRBE) implementation on arm64 captures more
> branch type classification which cannot be accommodated in the current perf
> branch record format via perf_branch_entry.type element (4 bit field). Also
> it captures privilege information which does not have a corresponding slot
> in perf_branch_entry. This series expands struct perf_branch_entry, to meet
> both these requirements without breaking the existing user space ABI for
> perf tools.
> 
> All architecture specific branch types added via perf_branch_entry.new_type
> field in [PATCH 3/4] will be used in BRBE implementation on arm64 platform
> later on with the following map.
> 
> #ifdef CONFIG_ARM64
> #define PERF_BR_FIQ		PERF_BR_NEW_ARCH_1
> #define PERF_BR_DEBUG_HALT	PERF_BR_NEW_ARCH_2
> #define PERF_BR_DEBUG_EXIT	PERF_BR_NEW_ARCH_3
> #define PERF_BR_DEBUG_INST	PERF_BR_NEW_ARCH_4
> #define PERF_BR_DEBUG_DATA	PERF_BR_NEW_ARCH_5
> #endif
> 
> This actually combines following patches and series into a single series.
> 
> - https://lore.kernel.org/all/1642998653-21377-12-git-send-email-anshuman.khandual@arm.com/
> - https://lore.kernel.org/all/1643348653-24367-1-git-send-email-anshuman.khandual@arm.com/
> - https://lore.kernel.org/all/1645681014-3346-1-git-send-email-anshuman.khandual@arm.com/
> 
> This series applies on v5.18-rc1
> 
> perf API
> 
> The series being applied
> 
> - Clean : tools/perf/check-headers.sh
> - Clean : diff -u tools/include/uapi/linux/perf_event.h include/uapi/linux/perf_event.h
> 
> Todo
> 
> - Update perf report tool to process PERF_BR_EXTEND_ABI (when available),
>   then fetch and report branch types from perf_branch_entry.new_type field.
> 
> References
> 
> - BRBE captured branch record information
> 
> https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers/BRBINF-n--EL1--Branch-Record-Buffer-Information-Register--n-?lang=en
> 
> - BRBE based perf branch stack implementation on arm64 platform
> 
> https://lore.kernel.org/all/1642998653-21377-1-git-send-email-anshuman.khandual@arm.com/
> 
> Changes in V5:
> 
> - Dropped patches [PATCH 1/10] and [PATCH 6/10] related to PERF_BR_[RET|IRQ] - merged
>   via the commit cedd3614e5d9c809 ("perf: Add irq and exception return branch types")
> 
> - Rebased series on v5.18-rc1

Gentle ping, any updates on this series ?