linux-kernel - Re: [PATCHv8 26/32] thp: update Documentation/vm/transhuge.txt

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Message-ID: <20160520103319.GA4269@node.shutemov.name>
Date:	Fri, 20 May 2016 13:33:19 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Julien Grall <julien.grall@....com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Jerome Marchand <jmarchan@...hat.com>,
	Yang Shi <yang.shi@...aro.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Ning Qu <quning@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	Steve Capper <Steve.Capper@....com>
Subject: Re: [PATCHv8 26/32] thp: update Documentation/vm/transhuge.txt

On Thu, May 19, 2016 at 05:20:01PM +0100, Julien Grall wrote:
> Hello Kirill,
> 
> On 12/05/16 16:41, Kirill A. Shutemov wrote:
> >Add info about tmpfs/shmem with huge pages.
> >
> >Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> >---
> >  Documentation/vm/transhuge.txt | 130 +++++++++++++++++++++++++++++------------
> >  1 file changed, 93 insertions(+), 37 deletions(-)
> >
> >diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt
> >index d9cb65cf5cfd..96a49f123cac 100644
> >--- a/Documentation/vm/transhuge.txt
> >+++ b/Documentation/vm/transhuge.txt
> >@@ -9,8 +9,8 @@ using huge pages for the backing of virtual memory with huge pages
> >  that supports the automatic promotion and demotion of page sizes and
> >  without the shortcomings of hugetlbfs.
> >
> >-Currently it only works for anonymous memory mappings but in the
> >-future it can expand over the pagecache layer starting with tmpfs.
> >+Currently it only works for anonymous memory mappings and tmpfs/shmem.
> >+But in the future it can expand to other filesystems.
> >
> >  The reason applications are running faster is because of two
> >  factors. The first factor is almost completely irrelevant and it's not
> >@@ -48,7 +48,7 @@ miss is going to run faster.
> >  - if some task quits and more hugepages become available (either
> >    immediately in the buddy or through the VM), guest physical memory
> >    backed by regular pages should be relocated on hugepages
> >-  automatically (with khugepaged)
> >+  automatically (with khugepaged, limited to anonymous huge pages for now)
> 
> Is it still relevant? I think the patch #30 at the support for tmpfs/shmem.

I forgot to update documentation. I'll do for the next round when rebase
to v4.7-rc1.

Thanks for noticing this.

-- 
 Kirill A. Shutemov