linux-kernel - Re: [PATCH 08/10] cgroups: Pull up res counter charge failure interpretation to caller

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Message-ID: <20111004013245.GB7361@shutemov.name>
Date:	Tue, 4 Oct 2011 04:32:45 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Menage <paul@...lmenage.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Aditya Kali <adityakali@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Tim Hockin <thockin@...kin.org>, Tejun Heo <tj@...nel.org>,
	Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH 08/10] cgroups: Pull up res counter charge failure
 interpretation to caller

On Mon, Oct 03, 2011 at 09:07:10PM +0200, Frederic Weisbecker wrote:
> res_counter_charge() always returns -ENOMEM when the limit is reached
> and the charge thus can't happen.
> 
> However it's up to the caller to interpret this failure and return
> the appropriate error value. The task counter subsystem will need
> to report the user that a fork() has been cancelled because of some
> limit reached, not because we are too short on memory.
> 
> Fix this by returning -1 when res_counter_charge() fails.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>

Acked-by: Kirill A. Shutemov <kirill@...temov.name>

> Cc: Paul Menage <paul@...lmenage.org>
> Cc: Li Zefan <lizf@...fujitsu.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Aditya Kali <adityakali@...gle.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Kay Sievers <kay.sievers@...y.org>
> Cc: Tim Hockin <thockin@...kin.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Kirill A. Shutemov <kirill@...temov.name>
> Cc: Containers <containers@...ts.linux-foundation.org>
> ---
>  Documentation/cgroups/resource_counter.txt |    2 ++
>  kernel/res_counter.c                       |    2 +-
>  2 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/Documentation/cgroups/resource_counter.txt b/Documentation/cgroups/resource_counter.txt
> index a2cd05b..24ec61c 100644
> --- a/Documentation/cgroups/resource_counter.txt
> +++ b/Documentation/cgroups/resource_counter.txt
> @@ -76,6 +76,8 @@ to work with it.
>  	limit_fail_at parameter is set to the particular res_counter element
>  	where the charging failed.
>  
> +	It returns 0 on success and -1 on failure.
> +
>   d. int res_counter_charge_locked
>  			(struct res_counter *rc, unsigned long val)
>  
> diff --git a/kernel/res_counter.c b/kernel/res_counter.c
> index 6b36823..b814d6c 100644
> --- a/kernel/res_counter.c
> +++ b/kernel/res_counter.c
> @@ -26,7 +26,7 @@ int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
>  {
>  	if (counter->usage + val > counter->limit) {
>  		counter->failcnt++;
> -		return -ENOMEM;
> +		return -1;
>  	}
>  
>  	counter->usage += val;
> -- 
> 1.7.5.4
> 

-- 
 Kirill A. Shutemov
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