From 0ddd2ae586d28e521d37393364d989ce118802e0 Mon Sep 17 00:00:00 2001 From: Zhu Lingshan Date: Tue, 4 Jun 2024 16:49:34 +0800 Subject: drm/ttm: increase ttm pre-fault value to PMD size MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reported-and-tested-by: Li Jingxiang Link: https://patchwork.freedesktop.org/patch/msgid/20240604084934.225738-1-lingshan.zhu@amd.com Reviewed-by: Christian König Signed-off-by: Christian König --- include/drm/ttm/ttm_bo.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/drm') 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; -- cgit v1.2.3