This patch set creates a vdso and moves the signal
trampolines to it from their previous home on the stack.
In the original patch set:
http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=49EE3B0F.3040506%40caviumnetworks.com
I stated:
Tested with a 64-bit kernel on a Cavium Octeon cn3860 where I have the
following results from lmbench2:
Before:
n64 - Signal handler overhead: 14.517 microseconds
n32 - Signal handler overhead: 14.497 microseconds
o32 - Signal handler overhead: 16.637 microseconds
After:
n64 - Signal handler overhead: 7.935 microseconds
n32 - Signal handler overhead: 7.334 microseconds
o32 - Signal handler overhead: 8.628 microsecond
All that is still true.
Improvements from the first version:
* Compiles and runs in 32-bit kernels (on qemu at least).
* Updated for linux-queue based 2.6.33-rc8
David Daney (3):
MIPS: Add SYSCALL to uasm.
MIPS: Preliminary vdso.
MIPS: Move signal trampolines off of the stack.
arch/mips/include/asm/abi.h | 6 +-
arch/mips/include/asm/elf.h | 4 +
arch/mips/include/asm/mmu.h | 5 +-
arch/mips/include/asm/mmu_context.h | 2 +-
arch/mips/include/asm/processor.h | 11 +++-
arch/mips/include/asm/uasm.h | 1 +
arch/mips/include/asm/vdso.h | 29 +++++++++
arch/mips/kernel/Makefile | 2 +-
arch/mips/kernel/signal-common.h | 5 --
arch/mips/kernel/signal.c | 86 ++++++---------------------
arch/mips/kernel/signal32.c | 55 ++++-------------
arch/mips/kernel/signal_n32.c | 26 ++------
arch/mips/kernel/syscall.c | 6 ++-
arch/mips/kernel/vdso.c | 112 +++++++++++++++++++++++++++++++++++
arch/mips/mm/uasm.c | 19 +++++-
15 files changed, 226 insertions(+), 143 deletions(-)
create mode 100644 arch/mips/include/asm/vdso.h
create mode 100644 arch/mips/kernel/vdso.c
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