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

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Message-ID: <D6EDEBF1F91015459DB866AC4EE162CC023F8B3E@IRSMSX103.ger.corp.intel.com>
Date:	Wed, 8 Jun 2016 08:51:00 +0000
From:	"Odzioba, Lukasz" <lukasz.odzioba@...el.com>
To:	Michal Hocko <mhocko@...nel.org>
CC:	"Hansen, Dave" <dave.hansen@...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 Tue 07-06-16 13:20:00, Michal Hocko wrote:
> I guess you want something like posix_memalign or start faulting in from
> an aligned address to guarantee you will fault 2MB pages. 

Good catch.

> Besides that I am really suspicious that this will be measurable at all.
> I would just go and spin a patch assuming you are still able to trigger
> OOM with the vanilla kernel. 

Yes, I am still able to trigger OOM, the tests I did are  more like sanity
checks rather than benchmarks. lru_cache_add takes very little time
so it was rather to look for some unexpected side effects.

Thank,
Lukas