lkml.org 
[lkml]   [2011]   [Oct]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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@gmail.com>

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

> Cc: Paul Menage <paul@paulmenage.org>
> Cc: Li Zefan <lizf@cn.fujitsu.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Aditya Kali <adityakali@google.com>
> Cc: Oleg Nesterov <oleg@redhat.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Kay Sievers <kay.sievers@vrfy.org>
> Cc: Tim Hockin <thockin@hockin.org>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Kirill A. Shutemov <kirill@shutemov.name>
> Cc: Containers <containers@lists.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


\
 
 \ /
  Last update: 2011-10-04 03:35    [W:0.173 / U:0.380 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site