15252 2023-10-23 11:35:01 +0000 Enables CONFIG_DEBUG_PREEMPT 2024-03-25 23:05:44 +0000 1 1 7 Build System, Metadata & Runtime OE-Core kernel 4.3 x86 Multiple RESOLVED FIXED Medium+ normal 5.1 1 ross.burton bruce.ashfield randy.macleod tom.zanussi --- --- No (bug/feature does not impact docs) oldest_to_newest 96763 0 ross.burton 2023-10-23 11:35:01 +0000 Our kernel enables CONFIG_DEBUG_PREEMPT: $ grep CONFIG_DEBUG_PREEMPT /yocto/ross/build/tmp/work/qemuarm64-poky-linux/linux-yocto/6.5.7+git/linux-qemuarm64-standard-build/.config CONFIG_DEBUG_PREEMPT=y (poky nanbield, qemuarm64) As per https://lore.kernel.org/lkml/ZTKScoO9kz_LxNMG@ariel/ this is basically a 20% performance hit in some benchmarks. I think we should disable it in default kernels. 96767 1 bruce.ashfield 2023-10-23 15:01:05 +0000 We don't have it on by default, only the selftests do: lib/oeqa/selftest/cases/runtime_test.py:KERNEL_EXTRA_FEATURES:append = " features/debug/debug-kernel.scc" So if we don't want it on for the tests, we need to change it there .. but that would get us less information about crashes and issues, so it isn't my call to make. 96768 2 ross.burton 2023-10-23 15:36:59 +0000 I hate to disagree with you, but in a brand new build tree: $ bitbake virtual/kernel -c showconfig Config file written to /yocto/ross/buildnew/tmp/work/qemux86_64-poky-linux/linux-yocto/6.5.7+git/linux-qemux86_64-standard-build/.config $ grep DEBUG.*= /yocto/ross/buildnew/tmp/work/qemux86_64-poky-linux/linux-yocto/6.5.7+git/linux-qemux86_64-standard-build/.config CONFIG_CGROUP_DEBUG=y CONFIG_X86_DEBUGCTLMSR=y CONFIG_PM_DEBUG=y CONFIG_PM_ADVANCED_DEBUG=y CONFIG_PM_SLEEP_DEBUG=y CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y CONFIG_BLK_DEBUG_FS=y CONFIG_BT_DEBUGFS=y CONFIG_PNP_DEBUG_MESSAGES=y CONFIG_SCSI_DEBUG=m CONFIG_CIFS_DEBUG=y CONFIG_DEBUG_BUGVERBOSE=y CONFIG_DEBUG_KERNEL=y CONFIG_DEBUG_MISC=y CONFIG_DEBUG_INFO=y CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y CONFIG_DEBUG_INFO_COMPRESSED_NONE=y CONFIG_DEBUG_FS=y CONFIG_DEBUG_FS_ALLOW_ALL=y CONFIG_ARCH_HAS_EARLY_DEBUG=y CONFIG_SLUB_DEBUG=y CONFIG_ARCH_HAS_DEBUG_WX=y CONFIG_HAVE_DEBUG_KMEMLEAK=y CONFIG_ARCH_HAS_DEBUG_VM_PGTABLE=y CONFIG_ARCH_HAS_DEBUG_VIRTUAL=y CONFIG_DEBUG_MEMORY_INIT=y CONFIG_SCHED_DEBUG=y CONFIG_DEBUG_PREEMPT=y CONFIG_LOCK_DEBUGGING_SUPPORT=y CONFIG_X86_DEBUG_FPU=y After the configure task the top-level .config is the active config, correct? 96769 3 bruce.ashfield 2023-10-23 17:00:31 +0000 Right, it is also enabled by the poky distro: meta-poky/conf/distro/poky.conf:KERNEL_EXTRA_FEATURES:append = " features/debug/debug-kernel.scc" So that is your culprit for the enable. 96770 4 ross.burton 2023-10-23 17:01:55 +0000 That seems suboptimal. 96771 5 ross.burton 2023-10-23 17:02:48 +0000 If SPDX needs symbols, can we have separate "debug symbols" and "debug statements"? 97233 6 bruce.ashfield 2023-11-09 15:36:28 +0000 This is under unit test now. 97238 7 bruce.ashfield 2023-11-09 17:31:16 +0000 https://git.yoctoproject.org/yocto-kernel-cache/log/?h=yocto-6.5