On Tue, Jun 04, 2024 at 04:49:34PM +0800, Zhu, Lingshan wrote: > 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> Acked-by: Huang Rui <ray.huang@xxxxxxx> > --- > 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 >
