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mm/debug: improve memcg debugging 

The memcg_data is only valid on the head page, not the tail pages.  Change
the format and location of the printout within the dump to match the other
parts of struct page better.

Link: https://lkml.kernel.org/r/20210114190200.1894484-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-02-24 12:01:29 -08:00 committed by Linus Torvalds
parent 457c82c351
commit 91f5345afb
1 changed files with 5 additions and 5 deletions
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10
mm/debug.c
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@ -110,6 +110,11 @@ void __dump_page(struct page *page, const char *reason)
head_compound_mapcount(head));
}
}
#ifdef CONFIG_MEMCG
if (head->memcg_data)
pr_warn("memcg:%lx\n", head->memcg_data);
#endif
if (PageKsm(page))
type = "ksm ";
else if (PageAnon(page))
@ -180,11 +185,6 @@ hex_only:
if (reason)
pr_warn("page dumped because: %s\n", reason);
#ifdef CONFIG_MEMCG
if (!page_poisoned && page->memcg_data)
pr_warn("pages's memcg:%lx\n", page->memcg_data);
#endif
}
void dump_page(struct page *page, const char *reason)