Le 06/02/2021 à 00:41, Andrew Morton a écrit :
On Thu, 4 Feb 2021 16:22:39 +0100 Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> wrote:
On Thu, Feb 04, 2021 at 09:39:42AM +0800, Huang Pei wrote:
MIPS page fault path(except huge page) takes 3 exceptions (1 TLB Miss
+ 2 TLB Invalid), butthe second TLB Invalid exception is just
triggered by __update_tlb from do_page_fault writing tlb without
_PAGE_VALID set. With this patch, user space mapping prot is made
young by default (with both _PAGE_VALID and _PAGE_YOUNG set),
and it only take 1 TLB Miss + 1 TLB Invalid exception
Remove pte_sw_mkyoung without polluting MM code and make page fault
delay of MIPS on par with other architecture
Signed-off-by: Huang Pei <huangpei@xxxxxxxxxxx>
---
arch/mips/mm/cache.c | 30 ++++++++++++++++--------------
include/linux/pgtable.h | 8 --------
mm/memory.c | 3 ---
3 files changed, 16 insertions(+), 25 deletions(-)
Acked-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Andrew, can you take this patch through your tree ?
Sure. I'll drop Christophe's "mm/memory.c: remove pte_sw_mkyoung()"
(https://lkml.kernel.org/r/f302ef92c48d1f08a0459aaee1c568ca11213814.1612345700.git.christophe.leroy@xxxxxxxxxx)
in favour of this one.
Pitty. My patch was improving page faults on powerpc/32. That one is only addressing MIPS.
Any plan to take the series from Nick
https://patchwork.kernel.org/project/linux-mm/list/?series=404539 ?
Christophe
