On Thu, May 30, 2024 at 11:41:04AM +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> Thanks Lingshan. I suggested to add reported-by from Jiangxiang like that: Reported-by: Jingxiang Li <jingxiang.li@xxxxxxxxxxxxxx> Jingxiang, could you please test this patch? We expect to have a Tested-by. :-) Thanks, Ray > --- > include/drm/ttm/ttm_bo.h | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/include/drm/ttm/ttm_bo.h b/include/drm/ttm/ttm_bo.h > index 6ccf96c91f3a..c20ef44002da 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 */ > -#define TTM_BO_VM_NUM_PREFAULT 16 > +#ifdef CONFIG_PGTABLE_HAS_HUGE_LEAVES > +#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 >
