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mm: verify the page links and memory model

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Print out information on how the page flags are being used if mminit_loglevel
is MMINIT_VERIFY or higher and unconditionally performs sanity checks on the
flags regardless of loglevel.

When the page flags are updated with section, node and zone information, a
check are made to ensure the values can be retrieved correctly.  Finally we
confirm that pfn_to_page and page_to_pfn are the correct inverse functions.

[[email protected]: fix printk warnings]
Signed-off-by: Mel Gorman <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2008-07-23 21:26:51 -07:00 • committed by Linus Torvalds
commit 708614e618
3 changed files with 91 additions and 0 deletions
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12
mm/internal.h
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@ -78,6 +78,10 @@ do { \
} \
} while (0)
extern void mminit_verify_pageflags_layout(void);
extern void mminit_verify_page_links(struct page *page,
enum zone_type zone, unsigned long nid, unsigned long pfn);
#else
static inline void mminit_dprintk(enum mminit_level level,
@ -85,5 +89,13 @@ static inline void mminit_dprintk(enum mminit_level level,
{
}
static inline void mminit_verify_pageflags_layout(void)
{
}
static inline void mminit_verify_page_links(struct page *page,
enum zone_type zone, unsigned long nid, unsigned long pfn)
{
}
#endif /* CONFIG_DEBUG_MEMORY_INIT */
#endif