linux-kernel - Re: [PATCH] splitlru: memcg swapbacked pages active

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]

Message-Id: <20080630114439.da792361.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 30 Jun 2008 11:44:39 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	Balbir Singh <balbir@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] splitlru: memcg swapbacked pages active

On Sun, 29 Jun 2008 01:22:22 +0100 (BST)
Hugh Dickins <hugh@...itas.com> wrote:

> add_to_page_cache_lru puts PageSwapBacked pages on the active_anon lru,
> so shouldn't mem_cgroup_charge_common mirror that by setting FLAG_ACTIVE?
> 
> Signed-off-by: Hugh Dickins <hugh@...itas.com>
> ---
> Should follow mmotm's vmscan-split-lru-lists-into-anon-file-sets.patch
> 
>  mm/memcontrol.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- mmotm/mm/memcontrol.c	2008-06-27 13:39:20.000000000 +0100
> +++ linux/mm/memcontrol.c	2008-06-27 17:32:29.000000000 +0100
> @@ -560,6 +560,8 @@ static int mem_cgroup_charge_common(stru
>  		pc->flags = PAGE_CGROUP_FLAG_CACHE;
>  		if (page_is_file_cache(page))
>  			pc->flags |= PAGE_CGROUP_FLAG_FILE;
> +		else
> +			pc->flags |= PAGE_CGROUP_FLAG_ACTIVE;
>  	} else
>  		pc->flags = PAGE_CGROUP_FLAG_ACTIVE;
>  
> 
Hmm, maybe no trouble but we'll have to care shmem's page is not marked as
PAGE_CGROUP_FLAG_CACHE but charged by mem_cgroup_charge_cache_page(). 
(I think why shmem is charged as cache is because shmem is used for tmpfs)

pc->flags |= PAGE_CGROUP_FLAG_FILE |  PAGE_CGROUP_FLAG_ACTIVE;

is bad ? (or not work ? I can't catch yet.)


And we have to change this again ;)
==
        [MEM_CGROUP_STAT_RSS] = { "anon/swapcache", PAGE_SIZE, },
==


Thanks,
-Kame


--
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/