There have been repeated requests to store and print more metadata for each line, see the two patches for more details.
This patchset handles the storing part so that we could do it together with the other changes of the ring buffer structure. It would be nice to get it into the same kernel release to reduce pain on the crash tools side. My proposal is to make this information available via /dev/kmsg as dictionary values. The console output would probably need to be configurable. I would ignore syslog syscall that is hard to extend and is basically obsoleted by /dev/kmsg. The patchset applies on top of the current printk/linux.git, branch printk-rework (after the dict ring removal). You also need to merge "timekeeping-for-printk-2020-08-23" tag from tip.git. It provides "struct ktime_timestamps" and ktime_get_fast_timestamps(). I still need to add the gdb-related changes if there is not a strong opposition to these changes. I just wanted to send what I had before starting review of the logbuf_lock removal patchset. Petr Mladek (2): printk: Store all three timestamps printk: Add more information about the printk caller kernel/printk/printk.c | 129 ++++++++++++++++++++---------- kernel/printk/printk_ringbuffer.c | 43 +++++----- kernel/printk/printk_ringbuffer.h | 42 +++++++++- 3 files changed, 148 insertions(+), 66 deletions(-) -- 2.26.2
