Add a 'vmap_info_changed' flag to track changes to vmalloc() statistics. For simplicity this flag is set every time we unlock the vmap_area_lock.
This flag is not yet used. Cc: Linus Torvalds <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Rik van Riel <[email protected]> Cc: [email protected] Signed-off-by: Ingo Molnar <[email protected]> --- mm/vmalloc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 605138083880..d21febaa557a 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -276,7 +276,9 @@ EXPORT_SYMBOL(vmalloc_to_pfn); #define VM_LAZY_FREEING 0x02 #define VM_VM_AREA 0x04 -static DEFINE_SPINLOCK(vmap_area_lock); +static __cacheline_aligned_in_smp DEFINE_SPINLOCK(vmap_area_lock); + +static int vmap_info_changed; static inline void vmap_lock(void) { @@ -285,6 +287,7 @@ static inline void vmap_lock(void) static inline void vmap_unlock(void) { + vmap_info_changed = 1; spin_unlock(&vmap_area_lock); } -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
