On 2023/01/03 21:05, Tao Liu wrote:
> Maple tree is a new data structure for crash, so cmd_tree support is
> needed for users to dump and view the content of maple tree. This patch
> achieves this by porting mt_dump() and its related functions from kernel,
> and adapting them with tree cmd.
>
> We introduced a new -v arg specifically for dumping the complete
> content of maple tree:
>
> crash> tree -t maple 0xffff9034c006aec0 -v
>
> maple_tree(ffff9034c006aec0) flags 309, height 2 root 0xffff9034de70041e
>
> 0-18446744073709551615: node 0xffff9034de700400 depth 0 type 3 parent 0xffff9034c006aec1 contents:...
> 0-140112331583487: node 0xffff9034c01e8800 depth 1 type 1 parent 0xffff9034de700406 contents:...
> 0-94643156942847: (nil)
> 94643156942848-94643158024191: 0xffff9035131754c0
> 94643158024192-94643160117247: (nil)
> ...
>
> The old tree args can work as well:
>
> crash> tree -t maple -r mm_struct.mm_mt 0xffff9034c006aec0 -p
> ffff9035131754c0
> index: 0 position: root/0/1
> ffff9035131751c8
> index: 1 position: root/0/3
> ffff9035131757b8
> index: 2 position: root/0/4
> ...
Any reason for zero-based index?
The index is almost the number of valid entries in this implementation,
I think one-based index would be better.
>
> crash> tree -t maple 0xffff9034c006aec0 -p -x -s vm_area_struct.vm_start,vm_end
> ffff9035131754c0
> index: 0 position: root/0/1
> vm_start = 0x5613d3c00000,
> vm_end = 0x5613d3d08000,
> ffff9035131751c8
> index: 1 position: root/0/3
> vm_start = 0x5613d3f07000,
> vm_end = 0x5613d3f0b000,
> ffff9035131757b8
> index: 2 position: root/0/4
> vm_start = 0x5613d3f0b000,
> vm_end = 0x5613d3f14000,
> ....
>
> Signed-off-by: Tao Liu <ltao@xxxxxxxxxx>
> ---
> defs.h | 1 +
> maple_tree.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++
> tools.c | 67 +++++++++++++++++++++++++++++++++++++++-------------
> 3 files changed, 112 insertions(+), 17 deletions(-)
>
> diff --git a/defs.h b/defs.h
> index 46bfd4a..f98e189 100644
> --- a/defs.h
> +++ b/defs.h
> @@ -2713,6 +2713,7 @@ struct tree_data {
> #define TREE_PARSE_MEMBER (VERBOSE << 7)
> #define TREE_READ_MEMBER (VERBOSE << 8)
> #define TREE_LINEAR_ORDER (VERBOSE << 9)
> +#define TREE_STRUCT_VERBOSE (VERBOSE << 10)
>
> #define ALIAS_RUNTIME (1)
> #define ALIAS_RCLOCAL (2)
> diff --git a/maple_tree.c b/maple_tree.c
> index 0575db8..9de3f31 100644
> --- a/maple_tree.c
> +++ b/maple_tree.c
> @@ -176,6 +176,10 @@ static void do_mt_range64(ulong entry, ulong min, ulong max,
>
> maple_range_64_node = tmp_node + OFFSET(maple_node_mr64);
>
> + if (td && td->flags & TREE_STRUCT_VERBOSE) {
> + dump_mt_range64(maple_range_64_node);
> + }
> +
> for (i = 0; i < mt_slots[maple_range_64]; i++) {
> last = max;
>
> @@ -232,6 +236,10 @@ static void do_mt_arange64(ulong entry, ulong min, ulong max,
>
> maple_arange_64_node = tmp_node + OFFSET(maple_node_ma64);
>
> + if (td && td->flags & TREE_STRUCT_VERBOSE) {
> + dump_mt_arange64(maple_arange_64_node);
> + }
> +
> for (i = 0; i < mt_slots[maple_arange_64]; i++) {
> last = max;
>
> @@ -277,6 +285,49 @@ static void do_mt_entry(ulong entry, ulong min, ulong max, uint depth,
>
> if (!td)
> return;
> +
> + if (!td->count && td->structname_args) {
> + /*
> + * Retrieve all members' info only once (count == 0)
> + * After last iteration all memory will be freed up
> + */
> + e = (struct req_entry **)GETBUF(sizeof(*e) * td->structname_args);
> + for (i = 0; i < td->structname_args; i++)
> + e[i] = fill_member_offsets(td->structname[i]);
> + }
> +
> + td->count++;
> +
> + if (td->flags & TREE_STRUCT_VERBOSE) {
> + dump_mt_entry(entry, min, max, depth);
> + } else if (td->flags & VERBOSE && entry)
> + fprintf(fp, "%lx\n", entry);
> + if (td->flags & TREE_POSITION_DISPLAY && entry)
> + fprintf(fp, " index: %ld position: %s/%u\n",
> + (*global_index)++, path, index);
If one-based index is better, ++(*global_index).
Thanks,
Kazu
> +
> + if (td->structname) {
> + if (td->flags & TREE_STRUCT_RADIX_10)
> + print_radix = 10;
> + else if (td->flags & TREE_STRUCT_RADIX_16)
> + print_radix = 16;
> + else
> + print_radix = 0;
> +
> + for (i = 0; i < td->structname_args; i++) {
> + switch (count_chars(td->structname[i], '.')) {
> + case 0:
> + dump_struct(td->structname[i],
> + entry, print_radix);
> + break;
> + default:
> + if (td->flags & TREE_PARSE_MEMBER)
> + dump_struct_members_for_tree(td, i, entry);
> + else if (td->flags & TREE_READ_MEMBER)
> + dump_struct_members_fast(e[i], print_radix, entry);
> + }
> + }
> + }
> }
>
> static void do_mt_node(ulong entry, ulong min, ulong max,
> @@ -295,6 +346,10 @@ static void do_mt_node(ulong entry, ulong min, ulong max,
> readmem(maple_node, KVADDR, tmp_node, SIZE(maple_node),
> "mt_dump_node read maple_node", FAULT_ON_ERROR);
>
> + if (td && td->flags & TREE_STRUCT_VERBOSE) {
> + dump_mt_node(maple_node, tmp_node, type, min, max, depth);
> + }
> +
> switch (type) {
> case maple_dense:
> for (i = 0; i < mt_slots[maple_dense]; i++) {
> @@ -337,6 +392,12 @@ static int do_maple_tree_traverse(ulong ptr, int is_root,
> "mt_dump read maple_tree", FAULT_ON_ERROR);
> entry = ULONG(tmp_tree + OFFSET(maple_tree_ma_root));
>
> + if (td && td->flags & TREE_STRUCT_VERBOSE) {
> + fprintf(fp, "maple_tree(%lx) flags %X, height %u root 0x%lx\n\n",
> + ptr, UINT(tmp_tree + OFFSET(maple_tree_ma_flags)),
> + mt_height(tmp_tree), entry);
> + }
> +
> if (!xa_is_node(entry))
> do_mt_entry(entry, 0, 0, 0, 0, path, &global_index, ops);
> else if (entry) {
> diff --git a/tools.c b/tools.c
> index 5f86771..c2cfa7e 100644
> --- a/tools.c
> +++ b/tools.c
> @@ -30,7 +30,7 @@ static void dealloc_hq_entry(struct hq_entry *);
> static void show_options(void);
> static void dump_struct_members(struct list_data *, int, ulong);
> static void rbtree_iteration(ulong, struct tree_data *, char *);
> -static void dump_struct_members_for_tree(struct tree_data *, int, ulong);
> +void dump_struct_members_for_tree(struct tree_data *, int, ulong);
>
> struct req_entry {
> char *arg, *name, **member;
> @@ -40,8 +40,8 @@ struct req_entry {
> };
>
> static void print_value(struct req_entry *, unsigned int, ulong, unsigned int);
> -static struct req_entry *fill_member_offsets(char *);
> -static void dump_struct_members_fast(struct req_entry *, int, ulong);
> +struct req_entry *fill_member_offsets(char *);
> +void dump_struct_members_fast(struct req_entry *, int, ulong);
>
> FILE *
> set_error(char *target)
> @@ -3666,7 +3666,7 @@ dump_struct_members_fast(struct req_entry *e, int radix, ulong p)
> }
> }
>
> -static struct req_entry *
> +struct req_entry *
> fill_member_offsets(char *arg)
> {
> int j;
> @@ -4307,6 +4307,7 @@ dump_struct_members(struct list_data *ld, int idx, ulong next)
> #define RADIXTREE_REQUEST (0x1)
> #define RBTREE_REQUEST (0x2)
> #define XARRAY_REQUEST (0x4)
> +#define MAPLE_REQUEST (0x8)
>
> void
> cmd_tree()
> @@ -4317,6 +4318,7 @@ cmd_tree()
> struct datatype_member struct_member, *sm;
> struct syment *sp;
> ulong value;
> + char *type_name = NULL;
>
> type_flag = 0;
> root_offset = 0;
> @@ -4324,25 +4326,33 @@ cmd_tree()
> td = &tree_data;
> BZERO(td, sizeof(struct tree_data));
>
> - while ((c = getopt(argcnt, args, "xdt:r:o:s:S:plN")) != EOF) {
> + while ((c = getopt(argcnt, args, "xdt:r:o:s:S:plNv")) != EOF) {
> switch (c)
> {
> case 't':
> - if (type_flag & (RADIXTREE_REQUEST|RBTREE_REQUEST|XARRAY_REQUEST)) {
> + if (type_flag & (RADIXTREE_REQUEST|RBTREE_REQUEST|XARRAY_REQUEST|MAPLE_REQUEST)) {
> error(INFO, "multiple tree types may not be entered\n");
> cmd_usage(pc->curcmd, SYNOPSIS);
> }
>
> if (STRNEQ(optarg, "ra"))
> - if (MEMBER_EXISTS("radix_tree_root", "xa_head"))
> + if (MEMBER_EXISTS("radix_tree_root", "xa_head")) {
> type_flag = XARRAY_REQUEST;
> - else
> + type_name = "Xarrays";
> + } else {
> type_flag = RADIXTREE_REQUEST;
> - else if (STRNEQ(optarg, "rb"))
> + type_name = "radix trees";
> + }
> + else if (STRNEQ(optarg, "rb")) {
> type_flag = RBTREE_REQUEST;
> - else if (STRNEQ(optarg, "x"))
> + type_name = "rbtrees";
> + } else if (STRNEQ(optarg, "x")) {
> type_flag = XARRAY_REQUEST;
> - else {
> + type_name = "Xarrays";
> + } else if (STRNEQ(optarg, "m")) {
> + type_flag = MAPLE_REQUEST;
> + type_name = "maple trees";
> + } else {
> error(INFO, "invalid tree type: %s\n", optarg);
> cmd_usage(pc->curcmd, SYNOPSIS);
> }
> @@ -4417,6 +4427,9 @@ cmd_tree()
> "-d and -x are mutually exclusive\n");
> td->flags |= TREE_STRUCT_RADIX_10;
> break;
> + case 'v':
> + td->flags |= TREE_STRUCT_VERBOSE;
> + break;
> default:
> argerrs++;
> break;
> @@ -4426,13 +4439,17 @@ cmd_tree()
> if (argerrs)
> cmd_usage(pc->curcmd, SYNOPSIS);
>
> - if ((type_flag & (XARRAY_REQUEST|RADIXTREE_REQUEST)) && (td->flags & TREE_LINEAR_ORDER))
> - error(FATAL, "-l option is not applicable to %s\n",
> - type_flag & RADIXTREE_REQUEST ? "radix trees" : "Xarrays");
> + if ((type_flag & (XARRAY_REQUEST|RADIXTREE_REQUEST|MAPLE_REQUEST)) &&
> + (td->flags & TREE_LINEAR_ORDER))
> + error(FATAL, "-l option is not applicable to %s\n", type_name);
>
> - if ((type_flag & (XARRAY_REQUEST|RADIXTREE_REQUEST)) && (td->flags & TREE_NODE_OFFSET_ENTERED))
> - error(FATAL, "-o option is not applicable to %s\n",
> - type_flag & RADIXTREE_REQUEST ? "radix trees" : "Xarrays");
> + if ((type_flag & (XARRAY_REQUEST|RADIXTREE_REQUEST|MAPLE_REQUEST)) &&
> + (td->flags & TREE_NODE_OFFSET_ENTERED))
> + error(FATAL, "-o option is not applicable to %s\n", type_name);
> +
> + if ((type_flag & (RBTREE_REQUEST|XARRAY_REQUEST|RADIXTREE_REQUEST)) &&
> + (td->flags & TREE_STRUCT_VERBOSE))
> + error(FATAL, "-v option is not applicable to %s\n", type_name);
>
> if ((td->flags & TREE_ROOT_OFFSET_ENTERED) &&
> (td->flags & TREE_NODE_POINTER))
> @@ -4506,12 +4523,26 @@ next_arg:
> if (td->flags & TREE_STRUCT_RADIX_16)
> fprintf(fp, "%sTREE_STRUCT_RADIX_16",
> others++ ? "|" : "");
> + if (td->flags & TREE_PARSE_MEMBER)
> + fprintf(fp, "%sTREE_PARSE_MEMBER",
> + others++ ? "|" : "");
> + if (td->flags & TREE_READ_MEMBER)
> + fprintf(fp, "%sTREE_READ_MEMBER",
> + others++ ? "|" : "");
> + if (td->flags & TREE_LINEAR_ORDER)
> + fprintf(fp, "%sTREE_LINEAR_ORDER",
> + others++ ? "|" : "");
> + if (td->flags & TREE_STRUCT_VERBOSE)
> + fprintf(fp, "%sTREE_STRUCT_VERBOSE",
> + others++ ? "|" : "");
> fprintf(fp, ")\n");
> fprintf(fp, " type: ");
> if (type_flag & RADIXTREE_REQUEST)
> fprintf(fp, "radix\n");
> else if (type_flag & XARRAY_REQUEST)
> fprintf(fp, "xarray\n");
> + else if (type_flag & MAPLE_REQUEST)
> + fprintf(fp, "maple\n");
> else
> fprintf(fp, "red-black%s",
> type_flag & RBTREE_REQUEST ?
> @@ -4532,6 +4563,8 @@ next_arg:
> do_rdtree(td);
> else if (type_flag & XARRAY_REQUEST)
> do_xatree(td);
> + else if (type_flag & MAPLE_REQUEST)
> + do_mptree(td);
> else
> do_rbtree(td);
> hq_close();
--
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