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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) }
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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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+ PROVIDE (__executable_start = 0x01800000); . = 0x01800000 + SIZEOF_HEADERS;
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+ /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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+ .rela.sdata2 : { *(.rela.sdata2 .rela.sdata2.* .rela.gnu.linkonce.s2.*) }
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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.*) }
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+ .sdata2 : { *(.sdata2 .sdata2.* .gnu.linkonce.s2.*) }
+ .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
+ from the crtend.o file until after the sorted ctors.
+ 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))
+ }
+ .jcr : { KEEP (*(.jcr)) }
+ .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)
+ }
+ .data1 : { *(.data1) }
+ . = ALIGN(64); /* COHERENCY_UNIT */
+ .data.cacheline_aligned : { *(.data.cacheline_aligned) }
+ . = ALIGN(64); /* COHERENCY_UNIT */
+ .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.*)
+ }
+ _edata = .;
+ PROVIDE (edata = .);
+ __bss_start = .;
+ .sbss :
+ {
+ PROVIDE (__sbss_start = .);
+ PROVIDE (___sbss_start = .);
+ *(.dynsbss)
+ *(.sbss .sbss.* .gnu.linkonce.sb.*)
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+ PROVIDE (__sbss_end = .);
+ PROVIDE (___sbss_end = .);
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+ .bss :
+ {
+ *(.dynbss)
+ *(.bss .bss.* .gnu.linkonce.b.*)
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+ _end. Align after .bss to ensure correct alignment even if the
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+ . = ALIGN(32 / 8);
+ }
+ . = ALIGN(32 / 8);
+ _end = .;
+ __end = .;
+ PROVIDE (end = .);
+ /* Stabs debugging sections. */
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+ .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) }
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+ Symbols in the DWARF debugging sections are relative to the beginning
+ of the section so we begin them at 0. */
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+ .debug 0 : { *(.debug) }
+ .line 0 : { *(.line) }
+ /* GNU DWARF 1 extensions */
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+ .debug_sfnames 0 : { *(.debug_sfnames) }
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+ .debug_macinfo 0 : { *(.debug_macinfo) }
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+ .debug_varnames 0 : { *(.debug_varnames) }
+ /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
+{
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+ .gcc_except_table : ONLY_IF_RW { KEEP (*(.gcc_except_table))
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+ .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
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+}
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