Re: [PATCH V6 0/8] perf: Expand perf_branch_entry
From: Anshuman Khandual <hidden>
Date: 2022-06-29 04:44:32
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linux-perf-users, lkml
On 6/10/22 09:20, 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 series applies on v5.19-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 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/ (local) Changes in V6: - Process PERF_BR_EXTEND_ABI in perf tools and fetch from perf_branch_entry.new_type - Modified the commit message for [PATCH 1/8]
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