Re: [PATCH v3] sparc64: Multi-page size support

[David Miller]

From: Nitin Gupta <nitin.m.gupta@xxxxxxxxxx>
Date: Tue, 22 Nov 2016 14:09:28 -0800

> Add support for using multiple hugepage sizes simultaneously
> on mainline. Currently, support for 256M has been added which
> can be used along with 8M pages.
> 
> Page tables are set like this (e.g. for 256M page):
>     VA + (8M * x) -> PA + (8M * x) (sz bit = 256M) where x in [0, 31]
> 
> and TSB is set similarly:
>     VA + (4M * x) -> PA + (4M * x) (sz bit = 256M) where x in [0, 63]
> 
> - Testing
> 
> Tested on Sonoma (which supports 256M pages) by running stream
> benchmark instances in parallel: one instance uses 8M pages and
> another uses 256M pages, consuming 48G each.
> 
> Boot params used:
> 
> default_hugepagesz=256M hugepagesz=256M hugepages=300 hugepagesz=8M
> hugepages=10000
> 
> Signed-off-by: Nitin Gupta <nitin.m.gupta@xxxxxxxxxx>

Applied.