powerpc/mm/slice: Simplify and optimise slice context initialisation
The slice state of an mm gets zeroed then initialised upon exec.
This is the only caller of slice_set_user_psize now, so that can be
removed and instead implement a faster and simplified approach that
requires no locking or checking existing state.
This speeds up vfork+exec+exit performance on POWER8 by 3%.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c
index 929d9ef..80acad5 100644
--- a/arch/powerpc/mm/mmu_context_book3s64.c
+++ b/arch/powerpc/mm/mmu_context_book3s64.c
@@ -94,13 +94,6 @@ static int hash__init_new_context(struct mm_struct *mm)
return index;
/*
- * In the case of exec, use the default limit,
- * otherwise inherit it from the mm we are duplicating.
- */
- if (!mm->context.slb_addr_limit)
- mm->context.slb_addr_limit = DEFAULT_MAP_WINDOW_USER64;
-
- /*
* The old code would re-promote on fork, we don't do that when using
* slices as it could cause problem promoting slices that have been
* forced down to 4K.
@@ -115,7 +108,7 @@ static int hash__init_new_context(struct mm_struct *mm)
* check against 0 is OK.
*/
if (mm->context.id == 0)
- slice_set_user_psize(mm, mmu_virtual_psize);
+ slice_init_new_context_exec(mm);
subpage_prot_init_new_context(mm);