On Wed, 18 Sep 2024 20:43:25 +0800 Xiang Gao <gxxa03070307@xxxxxxxxx> wrote:
> From: gaoxiang17 <gaoxiang17@xxxxxxxxxx>
>
> [ 24.225125] cma: cma_alloc(cma (____ptrval____), name: reserved, total count 16384, used count: 64, request count 1, align 0)
> [ 24.231963] cma: cma_alloc(cma (____ptrval____), name: reserved, total count 16384, used count: 65, request count 1, align 0)
> [ 24.235712] cma: cma_alloc(cma (____ptrval____), name: reserved, total count 16384, used count: 66, request count 1, align 0)
>
Providing before-and-after output would make the proposal more easily
understood.
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -403,6 +403,17 @@ static void cma_debug_show_areas(struct cma *cma)
> spin_unlock_irq(&cma->lock);
> }
>
> +static unsigned long cma_get_used(struct cma *cma)
> +{
> + unsigned long used;
> +
> + spin_lock_irq(&cma->lock);
> + used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma));
Is the (int) cast needed?
> + spin_unlock_irq(&cma->lock);
> +
> + return (unsigned long)used << cma->order_per_bit;
Is the (unsigned long) bast needed?
> +}
> +
> /**
> * cma_alloc() - allocate pages from contiguous area
> * @cma: Contiguous memory region for which the allocation is performed.
> @@ -430,8 +441,8 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
> if (!cma || !cma->count || !cma->bitmap)
> return page;
>
> - pr_debug("%s(cma %p, name: %s, count %lu, align %d)\n", __func__,
> - (void *)cma, cma->name, count, align);
> + pr_debug("%s(cma %p, name: %s, total count %lu, used count: %lu, request count %lu, align %d)\n", __func__,
> + (void *)cma, cma->name, cma->count, cma_get_used(cma), count, align);
>
> if (!count)
> return page;
> --
> 2.34.1
