Re: [PATCH] mm/compaction: avoid VM_BUG_ON(PageSlab()) in page_mapcount()

[Alex Shi]

在 2020/6/2 下午12:05, Hugh Dickins 写道:
> Cc'ing Alex Shi, because I noticed this when trying his v11 per-memcg
> lru_lock series (which appears to be a big improvement over earlier
> versions, thanks in particular to Johannes's memcg swap simplifications);
> and Alex's 12/16 makes a change on top of Konstantin's latter check,
> which will now just be reverted. I'm not yet confident in Alex's
> isolate_migratepages_block(), in part because this muddle.

Hi Hugh,

Yes, this could make a very tricky change on compaction behavior. I will update
the patchset after next update.

Thanks a lot for notice this! And looking forward to more comments on per memcg
lru_lock patchset! :)

Thanks
Alex