From: Andi Kleen Save some bytes in mm_struct by filling holes Putting int values together for better packing on 64bit shrinks sizeof(struct mm_struct) from 776 bytes to 764 bytes. Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton --- include/linux/mm_types.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff -puN include/linux/mm_types.h~mm-save-some-bytes-in-mm_struct-by-filling-holes-on-64bit include/linux/mm_types.h --- a/include/linux/mm_types.h~mm-save-some-bytes-in-mm_struct-by-filling-holes-on-64bit +++ a/include/linux/mm_types.h @@ -175,6 +175,7 @@ struct mm_struct { atomic_t mm_users; /* How many users with user space? */ atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ int map_count; /* number of VMAs */ + int core_waiters; struct rw_semaphore mmap_sem; spinlock_t page_table_lock; /* Protects page tables and some counters */ @@ -219,11 +220,10 @@ struct mm_struct { unsigned long flags; /* Must use atomic bitops to access the bits */ /* coredumping support */ - int core_waiters; struct completion *core_startup_done, core_done; /* aio bits */ - rwlock_t ioctx_list_lock; + rwlock_t ioctx_list_lock; /* aio lock */ struct kioctx *ioctx_list; #ifdef CONFIG_CGROUP_MEM_RES_CTLR struct mem_cgroup *mem_cgroup; _