linux-kernel - Re: [PATCH 4/7] proc: export more page flags in /proc/kpageflags

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Thu,  7 May 2009 11:48:55 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Matt Mackall <mpm@...enic.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 4/7] proc: export more page flags in /proc/kpageflags

> On Thu, May 07, 2009 at 10:40:16AM +0800, Minchan Kim wrote:
> > On Thu, 07 May 2009 09:21:21 +0800
> > Wu Fengguang <fengguang.wu@...el.com> wrote:
> > 
> > > +	 * pseudo flags for the well known (anonymous) memory mapped pages
> > > +	 */
> > > +	if (!PageSlab(page) && page_mapped(page))
> > > +		u |= 1 << KPF_MMAP;
> > > +	if (PageAnon(page))
> > > +		u |= 1 << KPF_ANON;
> > 
> > Why do you check PageSlab on user pages ?
> > Is there any case that PageSlab == true && page_mapped == true ?
> 
> Yes at least for SLUB: it reuses page->_mapcount, so page_mapped() is
> meaningless for slab pages.

this question and answer implies more comment required...



--
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/