Re: [RFC v3 0/5] Transparent on-demand struct page initializationembedded in the buddy allocator

From: Nathan Zimmer
Date: Tue Aug 13 2013 - 17:35:12 EST

On 08/13/2013 01:04 PM, Mike Travis wrote:

On 8/13/2013 10:51 AM, Linus Torvalds wrote:
by the time you can log in. And if it then takes another ten minutes
until you have the full 16TB initialized, and some things might be a
tad slower early on, does anybody really care? The machine will be up
and running with plenty of memory, even if it may not be *all* the
memory yet.
Before the patches adding memory took ~45 mins for 16TB and almost 2 hours
for 32TB. Adding it late sped up early boot but late insertion was still
very slow, where the full 32TB was still not fully inserted after an hour.
Doing it in parallel along with the memory hotplug lock per node, we got
it down to the 10-15 minute range.
Yes but to get it to the 10-15 minute range I had to change an number of system locks.
The system_sleep, the memory_hotplug, zonelist_mutex and there was some general alteration
to various wmark routines.
Some of those fixes I don't know if they would stand up to proper scrutiny but were quick and dirty
hacks to allow for progress.

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