答复: [PATCH] Fix "vtop" command to display the swapinfo for arm64 kernel 6.1+

[陈冠有 <chenguanyou@xxxxxxxxxx>]

arm64/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE

Let's use one of the type bits: core-mm only supports 5, so there is no

need to consume 6.

Note that we might be able to reuse bit 1, but reusing bit 1 turned out

problematic in the past for PROT_NONE handling; so let's play safe and use

another bit.

Link: https://lkml.kernel.org/r/20220329164329.208407-5-david@xxxxxxxxxx

---

发件人: 陈冠有
发送时间: 2023年9月14日 15:51:31
收件人: crash-utility@xxxxxxxxxx
抄送: lijiang@xxxxxxxxxx; k-hagio-ab@xxxxxxx
主题: [PATCH] Fix "vtop" command to display the swapinfo for arm64 kernel 6.1+

 

#define __SWP_TYPE_SHIFT    3

#define __SWP_TYPE_BITS     5

Before:

crash> vtop 70504000

VIRTUAL     PHYSICAL

70504000    (not mapped)

PAGE DIRECTORY: ffffff80f265c000

   PGD: ffffff80f265c008 => 800000141537003

   PMD: ffffff8101537c10 => 800000141538003

   PTE: ffffff8101538820 => 12bc3e04

  PTE     vtop: cannot determine swap location

After:

crash> vtop 70504000

VIRTUAL     PHYSICAL

70504000    (not mapped)

PAGE DIRECTORY: ffffff80f265c000

   PGD: ffffff80f265c008 => 800000141537003

   PMD: ffffff8101537c10 => 800000141538003

   PTE: ffffff8101538820 => 12bc3e04

  PTE                     SWAP                  OFFSET

12bc3e04  /first_stage_ramdisk/dev/block/zram0  1227838

      VMA           START       END     FLAGS FILE

ffffff80dfe7b578   70504000   707bd000 100073

SWAP: /first_stage_ramdisk/dev/block/zram0  OFFSET: 1227838

Signed-off-by: chenguanyou <chenguanyou@xxxxxxxxxx>

---

 arm64.c | 12 ++++++++++--

 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arm64.c b/arm64.c

index 39d5f04..ea1b51b 100644

--- a/arm64.c

+++ b/arm64.c

@@ -468,8 +468,16 @@ arm64_init(int when)

            }

        }

-

-       if (THIS_KERNEL_VERSION >= LINUX(4,0,0)) {

+       if (THIS_KERNEL_VERSION >= LINUX(6,1,0)) {

+           ms->__SWP_TYPE_BITS = 5;

+           ms->__SWP_TYPE_SHIFT = 3;

+           ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1);

+           ms->__SWP_OFFSET_SHIFT = (ms->__SWP_TYPE_BITS + ms->__SWP_TYPE_SHIFT);

+           ms->__SWP_OFFSET_BITS = 50;

+           ms->__SWP_OFFSET_MASK = ((1UL << ms->__SWP_OFFSET_BITS) - 1);

+           ms->PTE_PROT_NONE = (1UL << 58);

+           ms->PTE_FILE = 0;  /* unused */

+       } else if (THIS_KERNEL_VERSION >= LINUX(4,0,0)) {

            ms->__SWP_TYPE_BITS = 6;

            ms->__SWP_TYPE_SHIFT = 2;

            ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1);

-- 

2.39.0

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