Messages in this thread | | | Date | Mon, 11 Apr 2022 11:16:02 +0530 | Subject | Re: [PATCH V5 0/8] perf: Expand perf_branch_entry | From | Anshuman Khandual <> |
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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 ?
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