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Commit 58268b97 authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Linus Torvalds
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[PATCH] s390: add read_mostly optimization 



Add a read_mostly section and define __read_mostly to prevent cache line
pollution due to writes for mostly read variables.  In addition fix the
incorrect alignment of the cache_line_aligned data section.  s390 has a
cacheline size of 256 bytes.

Signed-off-by: default avatarChristian Borntraeger <cborntra@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent b73d40c6

arch/s390/kernel/vmlinux.lds.S

+3 −1
Original line number Diff line number Diff line
@@ -58,9 +58,11 @@ SECTIONS 
  . = ALIGN(4096);

  .data.page_aligned : { *(.data.idt) }



  . = ALIGN(32);

  . = ALIGN(256);

  .data.cacheline_aligned : { *(.data.cacheline_aligned) }



  . = ALIGN(256);

  .data.read_mostly : { *(.data.read_mostly) }

  _edata = .;			/* End of data section */



  . = ALIGN(8192);		/* init_task */

include/asm-s390/cache.h

+2 −0
Original line number Diff line number Diff line
@@ -16,4 +16,6 @@ 


#define ARCH_KMALLOC_MINALIGN	8



#define __read_mostly __attribute__((__section__(".data.read_mostly")))



#endif