Re: [PATCH -next] mm: memcg: remove redundant seq_buf_has_overflowed()

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On Thu, Jun 27, 2024 at 12:13 AM Michal Hocko <mhocko@xxxxxxxx> wrote:
>
> On Wed 26-06-24 09:42:32, Xiu Jianfeng wrote:
> > Both the end of memory_stat_format() and memcg_stat_format() will call
> > WARN_ON_ONCE(seq_buf_has_overflowed()). However, memory_stat_format()
> > is the only caller of memcg_stat_format(), when memcg is on the default
> > hierarchy, seq_buf_has_overflowed() will be executed twice, so remove
> > the reduntant one.
>
> Shouldn't we rather remove both? Are they giving us anything useful
> actually? Would a simpl pr_warn be sufficient? Afterall all we care
> about is to learn that we need to grow the buffer size because our stats
> do not fit anymore. It is not really important whether that is an OOM or
> cgroupfs interface path.

Is it possible for userspace readers to break if the stats are
incomplete? If yes, I think WARN_ON_ONCE() may be prompted to make it
easier to catch and fix before deployment.





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