after:
crash> vtop 2000000
VIRTUAL PHYSICAL
2000000 (not mapped)
PAGE DIRECTORY: ffffff8106356000
PGD: ffffff8106356000 => 800000186355003
PMD: ffffff8106355080 => 8000001476f5003
PTE: ffffff80c76f5000 => 101a62004
PTE SWAP OFFSET
101a62004 /first_stage_ramdisk/dev/block/zram0 1055330
VMA START END FLAGS FILE
ffffff81a06e8b00 2000000 22000000 100073
SWAP: /first_stage_ramdisk/dev/block/zram0 OFFSET: 1055330
Guanyou Chen <[email protected]> 于2025年12月4日周四 18:33写道：
> Hi Lianbo
>
> Kernel commit 55564814a838 ("arm64/mm: Move PTE_PRESENT_INVALID
> to overlay PTE_NG"), which is contained in Linux 6.10 and
> later kernels, changed the format of swap entries on arm64.
> Without the patch, the "vtop" command cannot display swap information
>
> before:
> crash> vtop 2000000
> VIRTUAL PHYSICAL
> 2000000 (not mapped)
>
> PAGE DIRECTORY: ffffff8106356000
> PGD: ffffff8106356000 => 800000186355003
> PMD: ffffff8106355080 => 8000001476f5003
> PTE: ffffff80c76f5000 => 101a62004
>
> PTE OFFSET: 1055330
> vtop: cannot determine swap location
>
> without the patch:
> crash> vtop 2000000
> VIRTUAL PHYSICAL
> 2000000 (not mapped)
>
> PAGE DIRECTORY: ffffff8106356000
> PGD: ffffff8106356000 => 800000186355003
> PMD: ffffff8106355080 => 8000001476f5003
> PTE: ffffff80c76f5000 => 101a62004
>
> PTE SWAP OFFSET
> 101a62004 /first_stage_ramdisk/dev/block/zram0 1055330
>
> VMA START END FLAGS FILE
> ffffff81a06e8b00 2000000 22000000 100073
>
> SWAP: /first_stage_ramdisk/dev/block/zram0 OFFSET: 1055330
>
> Link:
> https://lore.kernel.org/r/[email protected]
> Signed-off-by: Guanyou.Chen <[email protected]>
> ---
> arm64.c | 11 ++++++++++-
> memory.c | 5 ++++-
> 2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/arm64.c b/arm64.c
> index 1723595..c125655 100644
> --- a/arm64.c
> +++ b/arm64.c
> @@ -712,7 +712,16 @@ arm64_init(int when)
> }
> }
>
> - if (THIS_KERNEL_VERSION >= LINUX(5,19,0)) {
> + if (THIS_KERNEL_VERSION >= LINUX(6,10,0)) {
> + ms->__SWP_TYPE_BITS = 5;
> + ms->__SWP_TYPE_SHIFT = 6;
> + ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1);
> + ms->__SWP_OFFSET_SHIFT = 12;
> + ms->__SWP_OFFSET_BITS = 50;
> + ms->__SWP_OFFSET_MASK = ((1UL << ms->__SWP_OFFSET_BITS) - 1);
> + ms->PTE_PROT_NONE = 0; /* unused */
> + ms->PTE_FILE = 0; /* unused */
> + } else if (THIS_KERNEL_VERSION >= LINUX(5,19,0)) {
> ms->__SWP_TYPE_BITS = 5;
> ms->__SWP_TYPE_SHIFT = 3;
> ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1);
> diff --git a/memory.c b/memory.c
> index 400d31a..cbc8d2f 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -16415,6 +16415,8 @@ get_swapdev(ulong type, char *buf)
> ulong vfsmnt;
> char *devname;
> char buf1[BUFSIZE];
> + int swap_file_is_file =
> + STREQ(MEMBER_TYPE_NAME("swap_info_struct", "swap_file"), "file");
>
> swap_info_init();
>
> @@ -16474,7 +16476,8 @@ get_swapdev(ulong type, char *buf)
> vfsmnt = ULONG(vt->swap_info_struct +
> OFFSET(swap_info_struct_swap_vfsmnt));
> get_pathname(swap_file, buf, BUFSIZE, 1, vfsmnt);
> - } else if (VALID_MEMBER
> (swap_info_struct_old_block_size)) {
> + } else if (VALID_MEMBER (swap_info_struct_old_block_size)
> + || swap_file_is_file) {
> devname = vfsmount_devname(file_to_vfsmnt(swap_file),
> buf1, BUFSIZE);
> get_pathname(file_to_dentry(swap_file),
> --
> 2.34.1
>
> Thanks.
> Guanyou
>
--
Crash-utility mailing list -- [email protected]
To unsubscribe send an email to [email protected]
https://${domain_name}/admin/lists/devel.lists.crash-utility.osci.io/
Contribution Guidelines: https://github.com/crash-utility/crash/wiki
