This patch set (against 2.6.29.1) creates a vdso and moves the signal trampolines to it from their previous home on the stack. 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 microseconds Comments encourged. I will reply with two patches. David Daney (2): 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 | 5 +- 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 | 2 +- arch/mips/kernel/vdso.c | 104 +++++++++++++++++++++++++++++++++++ 13 files changed, 190 insertions(+), 141 deletions(-) create mode 100644 arch/mips/include/asm/vdso.h create mode 100644 arch/mips/kernel/vdso.c
