Alexandre Ghiti d7fbcf40df riscv: Improve kasan population by using hugepages when possible ... The kasan functions that populates the shadow regions used to allocate them page by page and did not take advantage of hugepages, so fix this by trying to allocate hugepages of 1GB and fallback to 2MB hugepages or 4K pages in case it fails. This reduces the page table memory consumption and improves TLB usage, as shown below: Before this patch: ---[ Kasan shadow start ]--- 0xffffffc000000000-0xffffffc400000000 0x00000000818ef000 16G PTE . A . . . . R V 0xffffffc400000000-0xffffffc447fc0000 0x00000002b7f4f000 1179392K PTE D A . . . W R V 0xffffffc480000000-0xffffffc800000000 0x00000000818ef000 14G PTE . A . . . . R V ---[ Kasan shadow end ]--- After this patch: ---[ Kasan shadow start ]--- 0xffffffc000000000-0xffffffc400000000 0x00000000818ef000 16G PTE . A . . . . R V 0xffffffc400000000-0xffffffc440000000 0x0000000240000000 1G PGD D A . . . W R V 0xffffffc440000000-0xffffffc447e00000 0x00000002b7e00000 126M PMD D A . . . W R V 0xffffffc447e00000-0xffffffc447fc0000 0x00000002b818f000 1792K PTE D A . . . W R V 0xffffffc480000000-0xffffffc800000000 0x00000000818ef000 14G PTE . A . . . . R V ---[ Kasan shadow end ]--- Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2021-02-22 18:54:17 -08:00
..
cacheflush.c	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
context.c	RISC-V: Implement ASID allocator	2021-02-18 23:18:06 -08:00
extable.c	riscv: abstract out CSR names for supervisor vs machine mode	2019-11-05 09:20:42 -08:00
fault.c	riscv: Add uprobes supported	2021-01-14 15:09:08 -08:00
hugetlbpage.c	hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate	2020-06-03 20:09:46 -07:00
init.c	riscv: Get rid of MAX_EARLY_MAPPING_SIZE	2021-02-22 18:38:49 -08:00
kasan_init.c	riscv: Improve kasan population by using hugepages when possible	2021-02-22 18:54:17 -08:00
Makefile	riscv: Fixup patch_text panic in ftrace	2021-01-14 15:09:04 -08:00
pageattr.c	RISC-V Patches for the 5.11 Merge Window, Part 1	2020-12-18 10:43:07 -08:00
physaddr.c	riscv: mm: add support for CONFIG_DEBUG_VIRTUAL	2020-01-23 10:40:06 -08:00
ptdump.c	RISC-V: Add page table dump support for uefi	2020-10-02 14:31:33 -07:00
tlbflush.c	RISC-V: Issue a tlb page flush if possible	2019-10-29 11:32:18 -07:00