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authorDave Hansen <dave@sr71.net>2014-01-23 15:52:49 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:36:50 -0800
commitf0b791a34cb3cffd2bbc3ca4365c9b719fa2c9f3 (patch)
treec4aa42cd8ecd15eca056a944788f5457e3a370ef /mm/balloon_compaction.c
parent12ab028be0008640de712ca890dc1a9ae224934d (diff)
downloadlwn-f0b791a34cb3cffd2bbc3ca4365c9b719fa2c9f3.tar.gz
lwn-f0b791a34cb3cffd2bbc3ca4365c9b719fa2c9f3.zip
mm: print more details for bad_page()
bad_page() is cool in that it prints out a bunch of data about the page. But, I can never remember which page flags are good and which are bad, or whether ->index or ->mapping is required to be NULL. This patch allows bad/dump_page() callers to specify a string about why they are dumping the page and adds explanation strings to a number of places. It also adds a 'bad_flags' argument to bad_page(), which it then dumps out separately from the flags which are actually set. This way, the messages will show specifically why the page was bad, *specifically* which flags it is complaining about, if it was a page flag combination which was the problem. [akpm@linux-foundation.org: switch to pr_alert] Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Christoph Lameter <cl@linux.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/balloon_compaction.c')
-rw-r--r--mm/balloon_compaction.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c
index 07dbc8ec46cf..6e45a5074bf0 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -267,7 +267,7 @@ void balloon_page_putback(struct page *page)
put_page(page);
} else {
WARN_ON(1);
- dump_page(page);
+ dump_page(page, "not movable balloon page");
}
unlock_page(page);
}
@@ -287,7 +287,7 @@ int balloon_page_migrate(struct page *newpage,
BUG_ON(!trylock_page(newpage));
if (WARN_ON(!__is_movable_balloon_page(page))) {
- dump_page(page);
+ dump_page(page, "not movable balloon page");
unlock_page(newpage);
return rc;
}