This rfc patch set delays initializing large sections of memory until we have started cpus. This has the effect of reducing startup times on large memory systems. On 16TB it can take over an hour to boot and most of that time is spent initializing memory.
We avoid that bottleneck by delaying initialization until after we have started multiple cpus and can initialize in a multithreaded manner. This allows us to actually reduce boot time rather then just moving around the point of initialization. Mike and I have worked on this set for a while, with him doing the most of the heavy lifting, and are eager for some feedback. Mike Travis (2): x86_64, mm: Delay initializing large portion of memory x86_64, mm: Reinsert the absent memory Documentation/kernel-parameters.txt | 15 ++ arch/x86/Kconfig | 10 ++ arch/x86/include/asm/e820.h | 16 +- arch/x86/kernel/e820.c | 292 +++++++++++++++++++++++++++++++++++- drivers/base/memory.c | 83 ++++++++++ include/linux/memory.h | 5 + 6 files changed, 413 insertions(+), 8 deletions(-) -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
