linux-kernel - Re: mm: pages are not freed from lru_add

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Message-ID: <20160502150109.GB24419@node.shutemov.name>
Date:	Mon, 2 May 2016 18:01:10 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	"Odzioba, Lukasz" <lukasz.odzioba@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"Shutemov, Kirill" <kirill.shutemov@...el.com>,
	"Anaczkowski, Lukasz" <lukasz.anaczkowski@...el.com>
Subject: Re: mm: pages are not freed from lru_add_pvecs after process
 termination

On Mon, May 02, 2016 at 04:39:35PM +0200, Vlastimil Babka wrote:
> On 04/27/2016 07:11 PM, Dave Hansen wrote:
> >6. Perhaps don't use the LRU pagevecs for large pages.  It limits the
> >    severity of the problem.
> 
> I think that makes sense. Being large already amortizes the cost per base
> page much more than pagevecs do (512 vs ~22 pages?).

We try to do this already, don't we? Any spefic case where we have THPs on
pagevecs?

-- 
 Kirill A. Shutemov