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SubjectRe: [RFCv2 3/3] staging: ion: limit pool size
Hi,

On 10/23/2014 11:47 PM, Gioh Kim wrote:
> This patch limits pool size by page unit.
>

This looks useful. Might be nice to add a debugfs option
to change this at runtime as well.

> Signed-off-by: Gioh Kim <gioh.kim@lge.com>
> ---
> drivers/staging/android/ion/Kconfig | 4 ++++
> drivers/staging/android/ion/ion_page_pool.c | 26 ++++++++++++++++----------
> 2 files changed, 20 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/staging/android/ion/Kconfig b/drivers/staging/android/ion/Kconfig
> index 3452346..e6b1a54 100644
> --- a/drivers/staging/android/ion/Kconfig
> +++ b/drivers/staging/android/ion/Kconfig
> @@ -33,3 +33,7 @@ config ION_TEGRA
> help
> Choose this option if you wish to use ion on an nVidia Tegra.
>
> +config ION_POOL_LIMIT
> + int "Limit count of pages in pool"
> + depends on ION
> + default "0"

Can you add help text here? It would be useful to clarify that the
units are in pages and that 0 will allow unlimited growth of the
pool. This should also clarify that this is a limit per
individual pool and not a limit for all page pools in the system.

> diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
> index 165152f..d63e93f 100644
> --- a/drivers/staging/android/ion/ion_page_pool.c
> +++ b/drivers/staging/android/ion/ion_page_pool.c
> @@ -22,8 +22,11 @@
> #include <linux/module.h>
> #include <linux/slab.h>
> #include <linux/swap.h>
> +#include <linux/kconfig.h>
> #include "ion_priv.h"
>
> +#define POOL_LIMIT CONFIG_ION_POOL_LIMIT
> +

I don't think the extra #define helps anything here, was
there something else intended here?

> static void *ion_page_pool_alloc_pages(struct ion_page_pool *pool)
> {
> struct page *page = alloc_pages(pool->gfp_mask, pool->order);
> @@ -41,8 +44,21 @@ static void ion_page_pool_free_pages(struct ion_page_pool *pool,
> __free_pages(page, pool->order);
> }
>
> +static int ion_page_pool_total(struct ion_page_pool *pool, bool high)
> +{
> + int count = pool->low_count;
> +
> + if (high)
> + count += pool->high_count;
> +
> + return count << pool->order;
> +}
> +
> static int ion_page_pool_add(struct ion_page_pool *pool, struct page *page)
> {
> + if (POOL_LIMIT && ion_page_pool_total(pool, 1) > POOL_LIMIT)
> + return 1;
> +
> mutex_lock(&pool->mutex);
> if (PageHighMem(page)) {
> list_add_tail(&page->lru, &pool->high_items);
> @@ -103,16 +119,6 @@ void ion_page_pool_free(struct ion_page_pool *pool, struct page *page)
> ion_page_pool_free_pages(pool, page);
> }
>
> -static int ion_page_pool_total(struct ion_page_pool *pool, bool high)
> -{
> - int count = pool->low_count;
> -
> - if (high)
> - count += pool->high_count;
> -
> - return count << pool->order;
> -}
> -
> int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
> int nr_to_scan)
> {
>

Thanks,
Laura

--
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project


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