linux-kernel - Re: [PATCH 4/4] mm: prepare page_referenced() and page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20151106143900.e61c38b5bf3e44547873d9d2@linux-foundation.org>
Date:	Fri, 6 Nov 2015 14:39:00 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Vladimir Davydov <vdavydov@...allels.com>
Subject: Re: [PATCH 4/4] mm: prepare page_referenced() and page_idle to new
 THP refcounting

On Fri, 6 Nov 2015 12:29:21 +0200 "Kirill A. Shutemov" <kirill@...temov.name> wrote:

> > page_mapcount() is getting pretty bad too.
> 
> Do you want me to uninline slow path (PageCompound())?

I guess so.  Uninlining all of page_mapcount() does this:

gcc-4.4.4:

   text    data     bss     dec     hex filename
 973702  273954  831512 2079168  1fb9c0 mm/built-in.o-before
 970148  273954  831000 2075102  1fa9de mm/built-in.o-after

That's quite a bit of bloat.

I don't know why bss changed; this usually (always?) happens.  Seems
bogus.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/