Re: [PATCH 5/5] add shmem vmstat

[Christoph Lameter]

On Thu, 9 Jul 2009, KOSAKI Motohiro wrote:

> Recently, We faced several OOM problem by plenty GEM cache. and generally,
> plenty Shmem/Tmpfs potentially makes memory shortage problem.

"
Recently we encountered OOM problems due to memory use of the GEM cache.
Generally a large amuont of Shmem/Tmpfs pages tend to create a memory
shortage problem.
"

> We often use following calculation to know shmem pages,
>   shmem = NR_ACTIVE_ANON + NR_INACTIVE_ANON - NR_ANON_PAGES
> but it is wrong expression. it doesn't consider isolated page and
> mlocked page.

"
We often use the following calculation to determine the amount of shmem
pages:

shmem = NR_ACTIVE_ANON + NR_INACTIVE_ANON - NR_ANON_PAGES

however the expression does not consider isoalted and mlocked pages.
"

> Then, This patch make explicit Shmem/Tmpfs vm-stat accounting.

"
This patch adds explicit accounting for pages used by shmem and tmpfs.
"

Reviewed-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>

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