linux-kernel - Re: [PATCH] Hugepages should be accounted as unevictable pages.

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:	Tue, 23 Jun 2009 12:25:44 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	akataria@...are.com
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Mel Gorman <mel@....ul.ie>, linux-mm@...ck.org
Subject: Re: [PATCH] Hugepages should be accounted as unevictable pages.

> Looking at the output of /proc/meminfo, a user might get confused in thinking
> that there are zero unevictable pages, though, in reality their can be
> hugepages which are inherently unevictable. 
> 
> Though hugepages are not handled by the unevictable lru framework, they are
> infact unevictable in nature and global statistics counter should reflect that. 
> 
> For instance, I have allocated 20 huge pages on my system, meminfo shows this 
> 
> Unevictable:           0 kB
> Mlocked:               0 kB
> HugePages_Total:      20
> HugePages_Free:       20
> HugePages_Rsvd:        0
> HugePages_Surp:        0
> 
> After the patch:
> 
> Unevictable:       81920 kB
> Mlocked:               0 kB
> HugePages_Total:      20
> HugePages_Free:       20
> HugePages_Rsvd:        0
> HugePages_Surp:        0

At first, We should clarify the spec of unevictable.
Currently, Unevictable field mean the number of pages in unevictable-lru
and hugepage never insert any lru.

I think this patch will change this rule.



--
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/