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Re: __read_mostly and __mp_friendly annotations



On Sun, 23 May 2010 10:43:21 +0100, Matt Fleming 
<matt%console-pimps.org@localhost> wrote:
> Hi guys,
> 
> below is a patch that introduces __read_mostly and __mp_friendly
> annotations. These annotations allow infrequently modified data to be
> grouped together and allow aligning data on cacheline boundaries. This
> helps to mitigate false-sharing.

... and here are linker scripts for some more architectures that could
benefit from these annotations. Actually, it's a good idea for all
architectures to control where the aligned data is placed in the kernel
ELF but I've specifically targetted MP-capable ports with this patch as
they benefit the most (and hp700 because Nick asked nicely ;-)

Can the port maintainrs for alpha, hp700, macppc, powerpc and vax please
explicitly NAK these patches if they don't want me to commit them? Also,
I just used 64-bytes as the size of an architecture's COHERENCY_UNIT. If
any of the port masters have better values please shout.


Index: src/sys/arch/alpha/conf/Makefile.alpha
===================================================================
--- src.orig/sys/arch/alpha/conf/Makefile.alpha
+++ src/sys/arch/alpha/conf/Makefile.alpha
@@ -60,7 +60,8 @@ lock_stubs.o: assym.h
 ##
 ## (5) link settings
 ##
-LINKFORMAT=    -N
+KERN_LDSCRIPT?=        kern.ldscript
+LINKFORMAT=    -T ${ALPHA}/conf/${KERN_LDSCRIPT}
 TEXTADDR?=     fffffc0000430000
 ENTRYPOINT=    __transfer
 EXTRA_LINKFLAGS=       -G 4
Index: src/sys/arch/alpha/conf/kern.ldscript
===================================================================
--- /dev/null
+++ src/sys/arch/alpha/conf/kern.ldscript
@@ -0,0 +1,215 @@
+/*     $NetBSD$ */
+/* Script for -N: mix text and data on same page; don't align data */
+OUTPUT_FORMAT("elf64-alpha", "elf64-alpha",
+             "elf64-alpha")
+OUTPUT_ARCH(alpha)
+ENTRY(__start)
+SEARCH_DIR("/usr/lib");
+/* Do we need any of these for elf?
+   __DYNAMIC = 0;    */
+SECTIONS
+{
+  /* Read-only sections, merged into text segment: */
+  PROVIDE (__executable_start = 0x120000000); . = 0x120000000 + SIZEOF_HEADERS;
+  .interp         : { *(.interp) }
+  .hash           : { *(.hash) }
+  .dynsym         : { *(.dynsym) }
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+  .gnu.version    : { *(.gnu.version) }
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+  .gcc_except_table   : ONLY_IF_RW { KEEP (*(.gcc_except_table)) 
*(.gcc_except_table.*) }
+  /* Thread Local Storage sections  */
+  .tdata         : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
+  .tbss                  : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
+  /* Ensure the __preinit_array_start label is properly aligned.  We
+     could instead move the label definition inside the section, but
+     the linker would then create the section even if it turns out to
+     be empty, which isn't pretty.  */
+  . = ALIGN(64 / 8);
+  PROVIDE (__preinit_array_start = .);
+  .preinit_array     : { KEEP (*(.preinit_array)) }
+  PROVIDE (__preinit_array_end = .);
+  PROVIDE (__init_array_start = .);
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+       doesn't matter if the user does not
+       actually link against crtbegin.o; the
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+    KEEP (*(SORT(.ctors.*)))
+    KEEP (*(.ctors))
+  }
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+  {
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+}
Index: src/sys/arch/hp700/conf/ld.script
===================================================================
--- src.orig/sys/arch/hp700/conf/ld.script
+++ src/sys/arch/hp700/conf/ld.script
@@ -49,6 +49,11 @@ SECTIONS
                . = ALIGN(4096);
                edata = ABSOLUTE(.);
        } = 0
+       . = ALIGN(64);  /* COHERENCY_UNIT */
+       .data.cacheline_aligned         : { *(.data.cacheline_aligned) }
+       . = ALIGN(64);  /* COHERENCY_UNIT */
+       .data.read_mostly               : { *(.data.read_mostly) }
+       . = ALIGN(64);  /* COHERENCY_UNIT */
        .ctors  : { *(.ctors) }
        .dtors  : { *(.dtors) }
 
Index: src/sys/arch/macppc/conf/Makefile.macppc
===================================================================
--- src.orig/sys/arch/macppc/conf/Makefile.macppc
+++ src/sys/arch/macppc/conf/Makefile.macppc
@@ -78,7 +78,8 @@ ${SYSTEM_FIRST_OBJ}: ${SYSTEM_FIRST_SFIL
 ## (5) link settings
 ##
 TEXTADDR?=     0x100000
-LINKFORMAT=    -N
+KERN_LDSCRIPT?=        kern.ldscript
+LINKFORMAT=    -T ${THISPPC}/conf/${KERN_LDSCRIPT}
 ENTRYPOINT=    __start
 
 .if defined(NEED_SREC)
Index: src/sys/arch/macppc/conf/kern.ldscript
===================================================================
--- /dev/null
+++ src/sys/arch/macppc/conf/kern.ldscript
@@ -0,0 +1,221 @@
+/*     $NetBSD$ */
+/* Script for -N: mix text and data on same page; don't align data */
+OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc",
+             "elf32-powerpc")
+OUTPUT_ARCH(powerpc:common)
+ENTRY(_start)
+SEARCH_DIR("/home/mjf/src/NetBSD/clean/src/../macppc/tools/powerpc--netbsd/lib");
+/* Do we need any of these for elf?
+   __DYNAMIC = 0;    */
+PROVIDE (__stack = 0); PROVIDE (___stack = 0);
+SECTIONS
+{
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+      .bss section disappears because there are no input sections.  */
+   . = ALIGN(32 / 8);
+  }
+  . = ALIGN(32 / 8);
+  _end = .;
+  __end = .;
+  PROVIDE (end = .);
+  /* Stabs debugging sections.  */
+  .stab          0 : { *(.stab) }
+  .stabstr       0 : { *(.stabstr) }
+  .stab.excl     0 : { *(.stab.excl) }
+  .stab.exclstr  0 : { *(.stab.exclstr) }
+  .stab.index    0 : { *(.stab.index) }
+  .stab.indexstr 0 : { *(.stab.indexstr) }
+  .comment       0 : { *(.comment) }
+  /* DWARF debug sections.
+     Symbols in the DWARF debugging sections are relative to the beginning
+     of the section so we begin them at 0.  */
+  /* DWARF 1 */
+  .debug          0 : { *(.debug) }
+  .line           0 : { *(.line) }
+  /* GNU DWARF 1 extensions */
+  .debug_srcinfo  0 : { *(.debug_srcinfo) }
+  .debug_sfnames  0 : { *(.debug_sfnames) }
+  /* DWARF 1.1 and DWARF 2 */
+  .debug_aranges  0 : { *(.debug_aranges) }
+  .debug_pubnames 0 : { *(.debug_pubnames) }
+  /* DWARF 2 */
+  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
+  .debug_abbrev   0 : { *(.debug_abbrev) }
+  .debug_line     0 : { *(.debug_line) }
+  .debug_frame    0 : { *(.debug_frame) }
+  .debug_str      0 : { *(.debug_str) }
+  .debug_loc      0 : { *(.debug_loc) }
+  .debug_macinfo  0 : { *(.debug_macinfo) }
+  /* SGI/MIPS DWARF 2 extensions */
+  .debug_weaknames 0 : { *(.debug_weaknames) }
+  .debug_funcnames 0 : { *(.debug_funcnames) }
+  .debug_typenames 0 : { *(.debug_typenames) }
+  .debug_varnames  0 : { *(.debug_varnames) }
+  /DISCARD/ : { *(.note.GNU-stack) }
+}
Index: src/sys/arch/powerpc/conf/Makefile.powerpc
===================================================================
--- src.orig/sys/arch/powerpc/conf/Makefile.powerpc
+++ src/sys/arch/powerpc/conf/Makefile.powerpc
@@ -73,7 +73,8 @@ ${SYSTEM_FIRST_OBJ}: ${SYSTEM_FIRST_SFIL
 ## (5) link settings
 ##
 TEXTADDR?=     0x100000
-LINKFORMAT=    -N
+KERN_LDSCRIPT?=        kern.ldscript
+LINKFORMAT=    -T ${POWERPC}/conf/${KERN_LDSCRIPT}
 ENTRYPOINT=    __start
 
 .if defined(NEED_SREC)
Index: src/sys/arch/powerpc/conf/kern.ldscript
===================================================================
--- /dev/null
+++ src/sys/arch/powerpc/conf/kern.ldscript
@@ -0,0 +1,221 @@
+/*     $NetBSD$ */
+/* Script for -N: mix text and data on same page; don't align data */
+OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc",
+             "elf32-powerpc")
+OUTPUT_ARCH(powerpc:common)
+ENTRY(_start)
+SEARCH_DIR("/usr/lib");
+/* Do we need any of these for elf?
+   __DYNAMIC = 0;    */
+PROVIDE (__stack = 0); PROVIDE (___stack = 0);
+SECTIONS
+{
+  /* Read-only sections, merged into text segment: */
+  PROVIDE (__executable_start = 0x01800000); . = 0x01800000 + SIZEOF_HEADERS;
+  .interp         : { *(.interp) }
+  .hash           : { *(.hash) }
+  .dynsym         : { *(.dynsym) }
+  .dynstr         : { *(.dynstr) }
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+  .rel.text       : { *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*) }
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+  .rel.fini       : { *(.rel.fini) }
+  .rela.fini      : { *(.rela.fini) }
+  .rel.rodata     : { *(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*) }
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+  .rel.data       : { *(.rel.data .rel.data.* .rel.gnu.linkonce.d.*) }
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+  .rela.sbss2     : { *(.rela.sbss2 .rela.sbss2.* .rela.gnu.linkonce.sb2.*) }
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+  .rela.bss       : { *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*) }
+  .rel.plt        : { *(.rel.plt) }
+  .rela.plt       : { *(.rela.plt) }
+  .init           :
+  {
+    KEEP (*(.init))
+  } =0
+  .text           :
+  {
+    *(.text .stub .text.* .gnu.linkonce.t.*)
+    KEEP (*(.text.*personality*))
+    /* .gnu.warning sections are handled specially by elf32.em.  */
+    *(.gnu.warning)
+  } =0
+  .fini           :
+  {
+    KEEP (*(.fini))
+  } =0
+  PROVIDE (__etext = .);
+  PROVIDE (_etext = .);
+  PROVIDE (etext = .);
+  .rodata         : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
+  .rodata1        : { *(.rodata1) }
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+  .sbss2          : { *(.sbss2 .sbss2.* .gnu.linkonce.sb2.*) }
+  .eh_frame_hdr : { *(.eh_frame_hdr) }
+  .eh_frame       : ONLY_IF_RO { KEEP (*(.eh_frame)) }
+  .gcc_except_table   : ONLY_IF_RO { KEEP (*(.gcc_except_table)) 
*(.gcc_except_table.*) }
+  /* Adjust the address for the data segment.  We want to adjust up to
+     the same address within the page on the next page up.  */
+  . = .;
+  /* Exception handling  */
+  .eh_frame       : ONLY_IF_RW { KEEP (*(.eh_frame)) }
+  .gcc_except_table   : ONLY_IF_RW { KEEP (*(.gcc_except_table)) 
*(.gcc_except_table.*) }
+  /* Thread Local Storage sections  */
+  .tdata         : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
+  .tbss                  : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
+  /* Ensure the __preinit_array_start label is properly aligned.  We
+     could instead move the label definition inside the section, but
+     the linker would then create the section even if it turns out to
+     be empty, which isn't pretty.  */
+  . = ALIGN(32 / 8);
+  PROVIDE (__preinit_array_start = .);
+  .preinit_array     : { KEEP (*(.preinit_array)) }
+  PROVIDE (__preinit_array_end = .);
+  PROVIDE (__init_array_start = .);
+  .init_array     : { KEEP (*(.init_array)) }
+  PROVIDE (__init_array_end = .);
+  PROVIDE (__fini_array_start = .);
+  .fini_array     : { KEEP (*(.fini_array)) }
+  PROVIDE (__fini_array_end = .);
+  .ctors          :
+  {
+    /* gcc uses crtbegin.o to find the start of
+       the constructors, so we make sure it is
+       first.  Because this is a wildcard, it
+       doesn't matter if the user does not
+       actually link against crtbegin.o; the
+       linker won't look for a file to match a
+       wildcard.  The wildcard also means that it
+       doesn't matter which directory crtbegin.o
+       is in.  */
+    KEEP (*crtbegin*.o(.ctors))
+    /* We don't want to include the .ctor section from
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+       The .ctor section from the crtend file contains the
+       end of ctors marker and it must be last */
+    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .ctors))
+    KEEP (*(SORT(.ctors.*)))
+    KEEP (*(.ctors))
+  }
+  .dtors          :
+  {
+    KEEP (*crtbegin*.o(.dtors))
+    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors))
+    KEEP (*(SORT(.dtors.*)))
+    KEEP (*(.dtors))
+  }
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+  .data.rel.ro : { *(.data.rel.ro.local) *(.data.rel.ro*) }
+  .fixup          : { *(.fixup) }
+  .got1           : { *(.got1) }
+  .got2           : { *(.got2) }
+  .dynamic        : { *(.dynamic) }
+  .data           :
+  {
+    *(.data .gnu.linkonce.d.*)
+    KEEP (*(.gnu.linkonce.d.*personality*))
+    SORT(CONSTRUCTORS)
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+  .data.cacheline_aligned    : { *(.data.cacheline_aligned) }
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+  .data.read_mostly          : { *(.data.read_mostly) }
+  . = ALIGN(64);    /* COHERENCY_UNIT */
+  .got            : { *(.got.plt) *(.got) }
+  /* We want the small data sections together, so single-instruction offsets
+     can access them all, and initialized data all before uninitialized, so
+     we can shorten the on-disk segment size.  */
+  .sdata          :
+  {
+    *(.sdata .sdata.* .gnu.linkonce.s.*)
+  }
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+  PROVIDE (edata = .);
+  __bss_start = .;
+  .sbss           :
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+    PROVIDE (__sbss_start = .);
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+    *(.sbss .sbss.* .gnu.linkonce.sb.*)
+    *(.scommon)
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+    PROVIDE (___sbss_end = .);
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+  .plt            : { *(.plt) }
+  .bss            :
+  {
+   *(.dynbss)
+   *(.bss .bss.* .gnu.linkonce.b.*)
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+   /* Align here to ensure that the .bss section occupies space up to
+      _end.  Align after .bss to ensure correct alignment even if the
+      .bss section disappears because there are no input sections.  */
+   . = ALIGN(32 / 8);
+  }
+  . = ALIGN(32 / 8);
+  _end = .;
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+  PROVIDE (end = .);
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+  .stab.indexstr 0 : { *(.stab.indexstr) }
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+     of the section so we begin them at 0.  */
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+  .line           0 : { *(.line) }
+  /* GNU DWARF 1 extensions */
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+  /DISCARD/ : { *(.note.GNU-stack) }
+}
Index: src/sys/arch/vax/conf/Makefile.vax
===================================================================
--- src.orig/sys/arch/vax/conf/Makefile.vax
+++ src/sys/arch/vax/conf/Makefile.vax
@@ -57,7 +57,8 @@ subr.o: ${VAX}/vax/subr.S assym.h
 ## (5) link settings
 ##
 TEXTADDR?=     80000000
-LINKFORMAT=    -N
+KERN_LDSCRIPT?=        kern.ldscript
+LINKFORMAT=    -T ${VAX}/conf/${KERN_LDSCRIPT}
 LINKFLAGS_DEBUG=       -X
 LINKFLAGS_NORMAL=      -S
 
Index: src/sys/arch/vax/conf/kern.ldscript
===================================================================
--- /dev/null
+++ src/sys/arch/vax/conf/kern.ldscript
@@ -0,0 +1,187 @@
+/*     $NetBSD$ */
+/* Script for -N: mix text and data on same page; don't align data */
+OUTPUT_FORMAT("elf32-vax", "elf32-vax",
+             "elf32-vax")
+OUTPUT_ARCH(vax)
+ENTRY(_start)
+SEARCH_DIR("/usr/lib");
+/* Do we need any of these for elf?
+   __DYNAMIC = 0;    */
+SECTIONS
+{
+  /* Read-only sections, merged into text segment: */
+  PROVIDE (__executable_start = 0x10000); . = 0x10000 + SIZEOF_HEADERS;
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+  /* DWARF 2 */
+  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
+  .debug_abbrev   0 : { *(.debug_abbrev) }
+  .debug_line     0 : { *(.debug_line) }
+  .debug_frame    0 : { *(.debug_frame) }
+  .debug_str      0 : { *(.debug_str) }
+  .debug_loc      0 : { *(.debug_loc) }
+  .debug_macinfo  0 : { *(.debug_macinfo) }
+  /* SGI/MIPS DWARF 2 extensions */
+  .debug_weaknames 0 : { *(.debug_weaknames) }
+  .debug_funcnames 0 : { *(.debug_funcnames) }
+  .debug_typenames 0 : { *(.debug_typenames) }
+  .debug_varnames  0 : { *(.debug_varnames) }
+  /DISCARD/ : { *(.note.GNU-stack) }
+}


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