summaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
authorYinghai Lu <yinghai@kernel.org>2014-06-05 03:06:32 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-05 03:53:55 +0400
commit982792c782ef337381e982fd2047391886f89693 (patch)
tree756b78ae2a098c97393d15da6a70cbb4adacb067 /mm
parentc46a7c817e662a820373bb76b88d0ad67d6abe5d (diff)
downloadlinux-982792c782ef337381e982fd2047391886f89693.tar.xz
x86, mm: probe memory block size for generic x86 64bit
On system with 2TiB ram, current x86_64 have 128M as section size, and one memory_block only include one section. So will have 16400 entries under /sys/devices/system/memory/. Current code try to use block id to find block pointer in /sys for any section, and reuse that block pointer. that finding will take some time even after commit 7c243c7168dc ("mm: speedup in __early_pfn_to_nid") that will skip the search in that case during booting up. So solution could be increase block size just like SGI UV system did. (harded code to 2g). This patch is trying to probe the block size to make it match mmio remap size. for example, Intel Nehalem later system will have memory range [0, TOML), [4g, TOMH]. If the memory hole is 2g and total is 128g, TOM will be 2g, and TOM2 will be 130g. We could use 2g as block size instead of default 128M. That will reduce number of entries in /sys/devices/system/memory/ On system 6TiB system will reduce boot time by 35 seconds. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions