On 2025/5/24 01:23, SeongJae Park wrote:
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?
Sorry for not being clear. I mean a 64K pagesize kernel on Arm servers.
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@?
Yes, will add the Fixes tag in next version. Thanks for reviewing.
