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Commit 7edf85aa authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
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mm: save some bytes in mm_struct by filling holes on 64bit 



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: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b5ee5bef

include/linux/mm_types.h

+2 −2
Original line number Diff line number Diff line
@@ -172,6 +172,7 @@ 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 */
@@ -216,11 +217,10 @@ 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;