Messages in this thread | | | Date | Wed, 12 Mar 2008 11:05:37 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] Save some bytes in mm_struct by filling holes on 64bit |
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On Wed, 12 Mar 2008 15:28:07 +0100 Andi Kleen <ak@suse.de> wrote:
> > 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;
The current ioctx_list_lock position is better from a cache layout POV?
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