ttm page fault handler ttm_bo_vm_fault_reserved() maps TTM_BO_VM_NUM_PREFAULT more pages beforehand due to the principle of locality. However, on some platform the page faults are more costly, this patch intends to increase the number of ttm pre-fault to relieve the number of page faults. When multiple levels of page table is supported, the new default value would be the PMD size, similar to huge page. Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxx> Reported-and-tested-by: Li Jingxiang <jingxiang.li@xxxxxxxxxxxxxx> --- include/drm/ttm/ttm_bo.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/drm/ttm/ttm_bo.h b/include/drm/ttm/ttm_bo.h index 6ccf96c91f3a..ef0f52f56ebc 100644 --- a/include/drm/ttm/ttm_bo.h +++ b/include/drm/ttm/ttm_bo.h @@ -39,7 +39,11 @@ #include "ttm_device.h" /* Default number of pre-faulted pages in the TTM fault handler */ +#if CONFIG_PGTABLE_LEVELS > 2 +#define TTM_BO_VM_NUM_PREFAULT (1 << (PMD_SHIFT - PAGE_SHIFT)) +#else #define TTM_BO_VM_NUM_PREFAULT 16 +#endif struct iosys_map; -- 2.45.1
