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x86: Reorder mm_context_t to remove x86_64 alignment padding and thus shrink mm_struct
Reorder mm_context_t to remove alignment padding on 64 bit builds shrinking its size from 64 to 56 bytes. This allows mm_struct to shrink from 840 to 832 bytes, so using one fewer cache lines, and getting more objects per slab when using slub. slabinfo mm_struct reports before :- Sizes (bytes) Slabs ----------------------------------- Object : 840 Total : 7 SlabObj: 896 Full : 1 SlabSiz: 16384 Partial: 4 Loss : 56 CpuSlab: 2 Align : 64 Objects: 18 after :- Sizes (bytes) Slabs ---------------------------------- Object : 832 Total : 7 SlabObj: 832 Full : 1 SlabSiz: 16384 Partial: 4 Loss : 0 CpuSlab: 2 Align : 64 Objects: 19 Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> Cc: wilsons@start.ca Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Pekka Enberg <penberg@kernel.org> Link: http://lkml.kernel.org/r/1306244999.1999.5.camel@castor.rsk Signed-off-by: Ingo Molnar <mingo@elte.hu>
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1 changed files with 2 additions and 2 deletions
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@ -11,14 +11,14 @@
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typedef struct {
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void *ldt;
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int size;
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struct mutex lock;
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void *vdso;
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#ifdef CONFIG_X86_64
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/* True if mm supports a task running in 32 bit compatibility mode. */
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unsigned short ia32_compat;
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#endif
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struct mutex lock;
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void *vdso;
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} mm_context_t;
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#ifdef CONFIG_SMP
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