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Date: Wed, 12 Mar 2008 19:38:05 +0100 From: Andi Kleen <ak@...e.de> To: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH] Save some bytes in mm_struct by filling holes on 64bit > The current ioctx_list_lock position is better from a cache layout POV? Hmm ok you're right perhaps it's better to move core_waiters up instead. Updated patch Save some bytes in mm_struct by filling holes v2 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@...e.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 */ + 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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