Re: [Crash-utility] [PATCH RFC 0/1] Display relative lag of each CPU

----- Original Message ----- > While analyzing vmcore it is useful to have an information > about relative lag of each CPU. Usually, people do something like this: > > runq -t | grep CPU | sort -k3r | > awk 'NR==1{now=strtonum("0x"$3)}1{printf"%s\t%7.2fs behind\n", > $0,(now-strtonum("0x"$3))/1000000000}' > > Here, most recent runqueue timestamp is taken as a basis, and other > runqueues are assumed to lag behind it. This information can tell > the reviewer which CPU is experiencing some lockup, which is > especially useful for vmcores taken in virtual machines. > > I think it would be nice to have this feature implemented by crash > utility itself. OK... > Since this is an RFC and if this enhancement looks useful, I'd like > to ask to assist me with output indentation since dump_on_rq_timestamp(), > for instance, looks too implicit and (honestly) awful to use as it is. I don't know what you need assistance for? Dave > Oleksandr Natalenko (1): > runq: display relative lag of each CPU > > help.c | 4 +++- > task.c | 76 > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- > 2 files changed, 78 insertions(+), 2 deletions(-) > > -- > 2.15.0 > >