Messages in this thread Patch in this message | | | Date | Wed, 12 Mar 2008 15:28:07 +0100 | From | Andi Kleen <> | Subject | [PATCH] Save some bytes in mm_struct by filling holes on 64bit |
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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 760 bytes.
Signed-off-by: Andi Kleen <ak@suse.de>
Index: linux-2.6.25-rc5/include/linux/mm_types.h =================================================================== --- linux-2.6.25-rc5.orig/include/linux/mm_types.h +++ linux-2.6.25-rc5/include/linux/mm_types.h @@ -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 */ + rwlock_t ioctx_list_lock; /* aio lock */ struct rw_semaphore mmap_sem; spinlock_t page_table_lock; /* Protects page tables and some counters */ @@ -213,14 +214,13 @@ struct mm_struct { unsigned int token_priority; unsigned int last_interval; + int core_waiters; 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; struct kioctx *ioctx_list; #ifdef CONFIG_CGROUP_MEM_RES_CTLR struct mem_cgroup *mem_cgroup;
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