On Fri, 23 May 2025 10:20:29 -0700 SeongJae Park <sj@xxxxxxxxxx> wrote:
> On Fri, 23 May 2025 11:16:13 +0800 Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> wrote:
>
> > On some large machines with a high number of CPUs running a 64K kernel,
>
> What does 64K kernel means?
>
> > we found that the 'RES' field is always 0 displayed by the top command
> > for some processes, which will cause a lot of confusion for users.
> >
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 875525 root 20 0 12480 0 0 R 0.3 0.0 0:00.08 top
> > 1 root 20 0 172800 0 0 S 0.0 0.0 0:04.52 systemd
> >
> > The main reason is that the batch size of the percpu counter is quite large
> > on these machines, caching a significant percpu value, since converting mm's
> > rss stats into percpu_counter by commit f1a7941243c1 ("mm: convert mm's rss
> > stats into percpu_counter").
Forgot asking this, sorry. Should we add Fixes: tag and Cc stable@?
Thanks,
SJ
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