(2012/05/12 2:44), Glauber Costa wrote:
> This patch creates a mechanism that skip memcg allocations during
> certain pieces of our core code. It basically works in the same way
> as preempt_disable()/preempt_enable(): By marking a region under
> which all allocations will be accounted to the root memcg.
>
> We need this to prevent races in early cache creation, when we
> allocate data using caches that are not necessarily created already.
>
> Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
> CC: Christoph Lameter <cl@xxxxxxxxx>
> CC: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
> CC: Michal Hocko <mhocko@xxxxxxx>
> CC: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> CC: Johannes Weiner <hannes@xxxxxxxxxxx>
> CC: Suleiman Souhlal <suleiman@xxxxxxxxxx>
The concept seems okay to me but...
> ---
> include/linux/sched.h | 1 +
> mm/memcontrol.c | 25 +++++++++++++++++++++++++
> 2 files changed, 26 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 81a173c..0501114 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1613,6 +1613,7 @@ struct task_struct {
> unsigned long nr_pages; /* uncharged usage */
> unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
> } memcg_batch;
> + atomic_t memcg_kmem_skip_account;
If only 'current' thread touch this, you don't need to make this atomic counter.
you can use 'long'.
Thanks,
-Kame
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