linux-kernel - Re: [PATCH v2] sparc64: Trim page tables for 8M hugepages

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Message-Id: <20160729.110908.235038737335500296.davem@davemloft.net>
Date:	Fri, 29 Jul 2016 11:09:08 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nitin.m.gupta@...cle.com
Cc:	akpm@...ux-foundation.org, julian.calaby@...il.com,
	hughd@...gle.com, adam.buchbinder@...il.com, minchan@...nel.org,
	kirill.shutemov@...ux.intel.com, sfr@...b.auug.org.au,
	sudeep.holla@....com, chris.hyser@...cle.com,
	khalid.aziz@...cle.com, toshi.kani@....com, mhocko@...e.com,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sparc64: Trim page tables for 8M hugepages

From: Nitin Gupta <nitin.m.gupta@...cle.com>
Date: Fri, 29 Jul 2016 00:54:21 -0700

> For PMD aligned (8M) hugepages, we currently allocate
> all four page table levels which is wasteful. We now
> allocate till PMD level only which saves memory usage
> from page tables.
> 
> Also, when freeing page table for 8M hugepage backed region,
> make sure we don't try to access non-existent PTE level.
> 
> Orabug: 22630259
> 
> Signed-off-by: Nitin Gupta <nitin.m.gupta@...cle.com>
> ---
> Changelog v2 vs v1
>  - Combine fix for page table freeing with the main trimming patch (Dave)

Applied, thanks.