On 04/25/2012 03:23 PM, Minchan Kim wrote:
> The zsmalloc uses __flush_tlb_one and set_pte.
> It's very lower functions so that it makes arhcitecture dependency
> so currently zsmalloc is used by only x86.
> This patch changes them with map_vm_area and unmap_kernel_range so
> it should work all architecture.
>
> Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
> ---
> drivers/staging/zsmalloc/Kconfig | 4 ----
> drivers/staging/zsmalloc/zsmalloc-main.c | 27 +++++++++++++++++----------
> drivers/staging/zsmalloc/zsmalloc_int.h | 1 -
> 3 files changed, 17 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/staging/zsmalloc/Kconfig b/drivers/staging/zsmalloc/Kconfig
> index a5ab720..9084565 100644
> --- a/drivers/staging/zsmalloc/Kconfig
> +++ b/drivers/staging/zsmalloc/Kconfig
> @@ -1,9 +1,5 @@
> config ZSMALLOC
> tristate "Memory allocator for compressed pages"
> - # X86 dependency is because of the use of __flush_tlb_one and set_pte
> - # in zsmalloc-main.c.
> - # TODO: convert these to portable functions
> - depends on X86
> default n
> help
> zsmalloc is a slab-based memory allocator designed to store
> diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c
> index ff089f8..cc017b1 100644
> --- a/drivers/staging/zsmalloc/zsmalloc-main.c
> +++ b/drivers/staging/zsmalloc/zsmalloc-main.c
> @@ -442,7 +442,7 @@ static int zs_cpu_notifier(struct notifier_block *nb, unsigned long action,
> area = &per_cpu(zs_map_area, cpu);
> if (area->vm)
> break;
> - area->vm = alloc_vm_area(2 * PAGE_SIZE, area->vm_ptes);
> + area->vm = alloc_vm_area(2 * PAGE_SIZE, NULL);
> if (!area->vm)
> return notifier_from_errno(-ENOMEM);
> break;
> @@ -696,13 +696,22 @@ void *zs_map_object(struct zs_pool *pool, void *handle)
> } else {
> /* this object spans two pages */
> struct page *nextp;
> + struct page *pages[2];
> + struct page **page_array = &pages[0];
> + int err;
>
> nextp = get_next_page(page);
> BUG_ON(!nextp);
>
> + page_array[0] = page;
> + page_array[1] = nextp;
>
> - set_pte(area->vm_ptes[0], mk_pte(page, PAGE_KERNEL));
> - set_pte(area->vm_ptes[1], mk_pte(nextp, PAGE_KERNEL));
> + /*
> + * map_vm_area never fail because we already allocated
> + * pages for page table in alloc_vm_area.
> + */
> + err = map_vm_area(area->vm, PAGE_KERNEL, &page_array);
> + BUG_ON(err);
>
> /* We pre-allocated VM area so mapping can never fail */
> area->vm_addr = area->vm->addr;
> @@ -730,14 +739,12 @@ void zs_unmap_object(struct zs_pool *pool, void *handle)
> off = obj_idx_to_offset(page, obj_idx, class->size);
>
> area = &__get_cpu_var(zs_map_area);
> - if (off + class->size <= PAGE_SIZE) {
> + if (off + class->size <= PAGE_SIZE)
> kunmap_atomic(area->vm_addr);
> - } else {
> - set_pte(area->vm_ptes[0], __pte(0));
> - set_pte(area->vm_ptes[1], __pte(0));
> - __flush_tlb_one((unsigned long)area->vm_addr);
> - __flush_tlb_one((unsigned long)area->vm_addr + PAGE_SIZE);
> - }
> + else
> + unmap_kernel_range((unsigned long)area->vm->addr,
> + PAGE_SIZE * 2);
> +
I should have export unmap_kernel_range. :(
Before that, I will look into another option to reduce IPI storm.
Thanks.
--
Kind regards,
Minchan Kim
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