linux-kernel - Re: [PATCH -mm 3/5] memcg scalable file stat accounting method

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: <20100804095513.6fef0a3d.nishimura@mxp.nes.nec.co.jp>
Date:	Wed, 4 Aug 2010 09:55:13 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	vgoyal@...hat.com, m-ikeda@...jp.nec.com, gthelen@...gle.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH -mm 3/5] memcg scalable file stat accounting method

> @@ -1074,7 +1075,49 @@ static unsigned int get_swappiness(struc
>  	return swappiness;
>  }
>  
> -/* A routine for testing mem is not under move_account */
> +static void mem_cgroup_start_move(struct mem_cgroup *mem)
> +{
> +	int cpu;
> +	/* for fast checking in mem_cgroup_update_file_stat() etc..*/
> +	spin_lock(&mc.lock);
> +	for_each_possible_cpu(cpu)
> +		per_cpu(mem->stat->count[MEM_CGROUP_ON_MOVE], cpu) += 1;
> +	spin_unlock(&mc.lock);
> +
> +	synchronize_rcu();
> +}
> +
> +static void mem_cgroup_end_move(struct mem_cgroup *mem)
> +{
> +	int cpu;
> +
> +	if (!mem)
> +		return;
Is this check necessary?

Thanks,
Daisuke Nishimura.
--
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/