[Crash-utility] [PATCH v2 2/4] add folio_order function

Add the folio_order() which keeps the same logic as kernel code, and it will be used in the later patches. Signed-off-by: Huang Shijie <huangsj(a)hygon.cn&gt; --- defs.h | 4 ++++ memory.c | 22 ++++++++++++++++++++++ symbols.c | 2 ++ 3 files changed, 28 insertions(+) diff --git a/defs.h b/defs.h index d50f010..0f06d34 100644 --- a/defs.h +++ b/defs.h @@ -1425,6 +1425,7 @@ struct offset_table { /* stash of commonly-used offsets */ long page_buffers; long page_lru; long page_pte; + long folio__flags_1; long swap_info_struct_swap_file; long swap_info_struct_swap_vfsmnt; long swap_info_struct_flags; @@ -2399,6 +2400,7 @@ struct size_table { /* stash of commonly-used sizes */ long probe; long kobj_map; long page_flags; + long folio__flags_1; long module_sect_attr; long task_struct_utime; long task_struct_stime; @@ -6008,6 +6010,8 @@ ulong do_xarray(ulong, int, struct list_pair *, int); #define XARRAY_TAG_MASK (3UL) #define XARRAY_TAG_INTERNAL (2UL) +int folio_order(ulong folio); + int file_dump(ulong, ulong, ulong, int, int); #define DUMP_FULL_NAME 0x1 #define DUMP_INODE_ONLY 0x2 diff --git a/memory.c b/memory.c index cbc8d2f..9080332 100644 --- a/memory.c +++ b/memory.c @@ -547,6 +547,9 @@ vm_init(void) MEMBER_OFFSET_INIT(page_freelist, "page", "freelist"); MEMBER_OFFSET_INIT(page_page_type, "page", "page_type"); + MEMBER_OFFSET_INIT(folio__flags_1, "folio", "_flags_1"); + MEMBER_SIZE_INIT(folio__flags_1, "folio", "_flags_1"); + MEMBER_OFFSET_INIT(mm_struct_pgd, "mm_struct", "pgd"); MEMBER_OFFSET_INIT(swap_info_struct_swap_file, @@ -5690,6 +5693,7 @@ PG_slab_flag_init(void) #define v26_PG_private 12 +#define PG_head 6 #define PGMM_CACHED (512) static void @@ -20423,6 +20427,24 @@ static unsigned int oo_objects(ulong oo) return (oo & ((1 << 16) - 1)); } +int +folio_order(ulong folio) +{ + ulong v = 0; + + /* 1.) Check PG_head bit in the first page's flags. */ + readmem(folio + OFFSET(page_flags), KVADDR, &v, sizeof(ulong), + "folio.page.flags", FAULT_ON_ERROR); + if (!(v & (1 << PG_head))) + return 0; + + /* 2.) Get folio->_flags_1 in the second page */ + readmem(folio + OFFSET(folio__flags_1), KVADDR, &v, sizeof(ulong), + "folio->_flags_1", FAULT_ON_ERROR); + + return v & 0xff; +} + #ifdef NOT_USED ulong slab_to_kmem_cache_node(struct meminfo *si, ulong slab_page) diff --git a/symbols.c b/symbols.c index e6865ca..19fcc03 100644 --- a/symbols.c +++ b/symbols.c @@ -10451,6 +10451,7 @@ dump_offset_table(char *spec, ulong makestruct) fprintf(fp, " page_private: %ld\n", OFFSET(page_private)); fprintf(fp, " page_page_type: %ld\n", OFFSET(page_page_type)); + fprintf(fp, " folio__flags_1: %ld\n", OFFSET(folio__flags_1)); fprintf(fp, " trace_print_flags_mask: %ld\n", OFFSET(trace_print_flags_mask)); @@ -11961,6 +11962,7 @@ dump_offset_table(char *spec, ulong makestruct) fprintf(fp, "\n size_table:\n"); fprintf(fp, " page: %ld\n", SIZE(page)); fprintf(fp, " page_flags: %ld\n", SIZE(page_flags)); + fprintf(fp, " folio__flags_1: %ld\n", SIZE(folio__flags_1)); fprintf(fp, " trace_print_flags: %ld\n", SIZE(trace_print_flags)); fprintf(fp, " free_area_struct: %ld\n", SIZE(free_area_struct)); -- 2.43.0