dynamic-debug metadata is bloated; the __dyndbg linker section is effectively an array of struct _ddebugs, and its 1st 3 members are highly repetetive, with 90%, 84%, 45% repeats. Total reported usage ~150kb for ~2600 callsites on my laptop config.
This patchset is one diet plan. it all holds together nicely until the "cache" commit, when it blows up starting init (or right after freeing unused kernel image, which Im hoping to do...). last commit log has the BUG trace from a LOCKDEP build, which reports stuff I dont quite undertand, except that it looks bad. Jim Cromie (7): dyndbg: give %3u width in pr-format, cosmetic only dyndbg: motivate a diet plan dyndbg: select ZPOOL in Kconfig.debug dyndbg: split struct _ddebug in 2, creating _ddebug_callsite dyndbg: WIP replace __dyndbg_callsite section with a zs-pool copy. dyndbg: add locking around zpool-add loop in zpool-init dyndbg: enable 'cache' of active pr_debug callsites include/asm-generic/vmlinux.lds.h | 4 + include/linux/dynamic_debug.h | 36 +++-- lib/Kconfig.debug | 1 + lib/dynamic_debug.c | 220 +++++++++++++++++++++++++----- 4 files changed, 218 insertions(+), 43 deletions(-) -- 2.26.2
