linux-kernel - Re: [RFC][-mm] Simple stats for cpu resource controller v4

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]

Date:	Mon, 12 May 2008 16:48:33 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Balaji Rao <balajirrao@...il.com>
Cc:	dhaval@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org, menage@...gle.com, balbir@...ibm.com,
	vatsa@...ux.vnet.ibm.com, a.p.zijlstra@...llo.nl,
	dada1@...mosbay.com
Subject: Re: [RFC][-mm] Simple stats for cpu resource controller v4

On Mon, 12 May 2008 01:48:37 +0530
Balaji Rao <balajirrao@...il.com> wrote:

> Hi Andrew,
> 
> Here's a version that uses percpu_counters and which actually works. The 
> only evil it contains is the check, 
> 
> 	if (percpu_counter_ready) {
> 		..
> 	}

There's no instance of "percpu_counter_ready" in the patch so I'm a bit
stumped.

> @@ -3837,6 +3858,16 @@ void account_user_time(struct task_struct *p, cputime_t cputime)
>  		cpustat->nice = cputime64_add(cpustat->nice, tmp);
>  	else
>  		cpustat->user = cputime64_add(cpustat->user, tmp);
> +
> +       /* Charge the task's group */
> +#ifdef CONFIG_CGROUP_SCHED
> +	{
> +		struct task_group *tg;
> +		tg = task_group(p);
> +		__cpu_cgroup_stat_add(tg->stat, CPU_CGROUP_STAT_UTIME,
> +				cputime_to_msecs(cputime));
> +	}
> +#endif
>  }
>  
>  /*
> @@ -3892,8 +3923,17 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
>  		cpustat->irq = cputime64_add(cpustat->irq, tmp);
>  	else if (softirq_count())
>  		cpustat->softirq = cputime64_add(cpustat->softirq, tmp);
> -	else if (p != rq->idle)
> +	else if (p != rq->idle) {
>  		cpustat->system = cputime64_add(cpustat->system, tmp);
> +#ifdef CONFIG_CGROUP_SCHED
> +		{
> +			struct task_group *tg;
> +			tg = task_group(p);
> +			__cpu_cgroup_stat_add(tg->stat, CPU_CGROUP_STAT_STIME,
> +					cputime_to_msecs(cputime));
> +		}
> +	}
> +#endif

I'd suggest that the above be turned into calls to a helper function
which is a no-op if !CONFIG_CGROUP_SCHED.

--
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/