Re: [PATCH v3 1/2] Support for "dev -d|-D" options by parsing bitmap in blk-mq layer

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On 2022/06/02 12:35, lijiang wrote:
> On Wed, Jun 1, 2022 at 4:51 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab@xxxxxxx <mailto:k-hagio-ab@xxxxxxx>> wrote:
> 
>     Hi Lianbo,
> 
>     Thank you for the update, much better structure :)
> 
>     Let's go into detail...
> 
> 
> Thank you for helping the review, it seems that we are getting closer to this goal.

yes, thanks to your hard work :)

> 
>     On 2022/05/30 18:15, Lianbo Jiang wrote:
>      > Currently, crash doesn't support to display disk I/O statistics
>      > for blk-mq devices. For more details, please refer to the following
>      > commit: <98b417fc6346> ("Handle blk_mq_ctx member changes for kernels
>      > 5.16-rc1 and later").
>      >
>      > Lets parse the bitmap in blk-mq layer to achieve it.
>      >
>      > Signed-off-by: Lianbo Jiang <lijiang@xxxxxxxxxx <mailto:lijiang@xxxxxxxxxx>>
>      > ---
>      >   defs.h    |  11 +++
>      >   dev.c     | 261 ++++++++++++++++++++++++++++++++++++++++++++++--------
>      >   symbols.c |  22 +++++
>      >   3 files changed, 255 insertions(+), 39 deletions(-)
>      >
>      > diff --git a/defs.h b/defs.h
>      > index c8444b4e54eb..2681586a33dc 100644
>      > --- a/defs.h
>      > +++ b/defs.h
>      > @@ -2170,6 +2170,16 @@ struct offset_table {                    /* stash of commonly-used offsets */
>      >       long sbq_wait_state_wait;
>      >       long sbitmap_alloc_hint;
>      >       long sbitmap_round_robin;
>      > +     long request_cmd_flags;
>      > +     long request_q;
>      > +     long request_state;
>      > +     long request_queue_queue_hw_ctx;
>      > +     long request_queue_nr_hw_queues;
>      > +     long blk_mq_hw_ctx_tags;
>      > +     long blk_mq_tags_bitmap_tags;
>      > +     long blk_mq_tags_breserved_tags;
>      > +     long blk_mq_tags_nr_reserved_tags;
>      > +     long blk_mq_tags_rqs;
>      >   };
>      >
>      >   struct size_table {         /* stash of commonly-used sizes */
>      > @@ -2339,6 +2349,7 @@ struct size_table {         /* stash of commonly-used sizes */
>      >       long sbitmap;
>      >       long sbitmap_queue;
>      >       long sbq_wait_state;
>      > +     long blk_mq_tags;
>      >   };
>      >
>      >   struct array_table {
>      > diff --git a/dev.c b/dev.c
>      > index a493e51ac95c..c0240f7b889b 100644
>      > --- a/dev.c
>      > +++ b/dev.c
>      > @@ -4238,19 +4238,193 @@ get_one_mctx_diskio(unsigned long mctx, struct diskio *io)
>      >       io->write = (dispatch[1] - comp[1]);
>      >   }
>      >
>      > +typedef bool (busy_tag_iter_fn)(ulong rq, void *data);
>      > +
>      > +struct bt_iter_data {
> 
>     I think that some names are confusing and not synced with the kernel.
>     How about renaming to "mq_inflight"?
> 
>      > +     ulong q;
>      > +     struct diskio *dio;
>      > +};
>      > +
>      > +struct bt_tags_iter_data {
> 
>     And please rename this to "bt_iter_data".
> 
>      > +     ulong tags;
>      > +     uint flags;
> 
>     rename to "reserved".
> 
> 
> OK, I will rename the above three variables.
> 
>      > +     uint nr_reserved_tags;
>      > +     busy_tag_iter_fn *fn;
>      > +     void *data;
>      > +};
>      > +
>      > +/*
>      > + * See the include/linux/blk_types.h and include/linux/blk-mq.h
>      > + */
>      > +#define MQ_RQ_IN_FLIGHT 1
>      > +#define REQ_OP_BITS     8
>      > +#define REQ_OP_MASK     ((1 << REQ_OP_BITS) - 1)
>      > +
>      > +static uint op_is_write(uint op)
>      > +{
>      > +     return (op & REQ_OP_MASK) & 1;
>      > +}
>      > +
>      > +static bool mq_check_inflight(ulong rq, void *data)
>      > +{
>      > +     uint cmd_flags = 0, state = 0;
>      > +     ulong addr = 0, queue = 0;
>      > +     struct bt_iter_data *iter = data;
>      > +
>      > +     if (!IS_KVADDR(rq))
>      > +             return TRUE;
> 
>     Why return TRUE?
>     Does this mean that rq can be invalid with bit on?
> 
> The intent is to filter out the zero address of rq, and crash cannot completely believe that the address
> of rq is always valid. To be on the safe side, it should be good to do this check.
> In addition, the kernel has the similar logic of code, for example:
> static bool bt_tags_iter(...)
> {
> ...
> if (!rq)
>                  return true;
>                            ^^^^
> ...
> }

Got it, thanks.  I missed this comment:

         /*
          * We can hit rq == NULL here, because the tagging functions
          * test and set the bit before assigning ->rqs[].
          */

> 
>      > +
>      > +     addr = rq + OFFSET(request_q);
>      > +     if (!readmem(addr, KVADDR, &queue, sizeof(ulong), "request.q", RETURN_ON_ERROR))
>      > +             return FALSE;
>      > +
>      > +     addr = rq + OFFSET(request_cmd_flags);
>      > +     if (!readmem(addr, KVADDR, &cmd_flags, sizeof(uint), "request.cmd_flags", RETURN_ON_ERROR))
>      > +             return FALSE;
>      > +
>      > +     addr = rq + OFFSET(request_state);
>      > +     if (!readmem(addr, KVADDR, &state, sizeof(uint), "request.state", RETURN_ON_ERROR))
>      > +             return FALSE;
> 
>     Rethinking these, RETURN_ON_ERROR leads to stop counting (i.e. wrong results)
>     with error messages.  I think it would be better to use FAULT_ON_ERROR unless
>     we can ignore or handle an error correctly.  What do you think?
> 
>     (And for the RETURN_ON_ERRORs below, same as above.)
> 
> At first, I had the same opinion as yours. But eventually, called the readmem() with the "RETURN_ON_ERROR",
> the reason is that crash can help to output the statistics as much as possible, which is helpful to user, and once the
> readmem() failed, it will print an appropriate error, and it can explicitly tell users that the statistics may be unreliable.

Agree.  I tested and got this:

crash> dev -d
MAJOR GENDISK            NAME       REQUEST_QUEUE      TOTAL ASYNC  SYNC
dev: invalid kernel virtual address: 0  type: "request.q"
   252 ffff88ee0188c800   vda        ffff88ee11588ff0       0     0     0
   253 ffff88ee109fa200   dm-0       ffff88ee01a7aa80       0     0     0
   253 ffff88ee109fb000   dm-1       ffff88ee01a7da50      12    12     0

It would be better to print the remains as much as possible, let's go with
RETURN_ON_ERROR.

> 
> If this is really confusing to the user, let's replace it with the "FAULT_ON_ERROR".
> 
>      > +
>      > +     if (queue == iter->q && state == MQ_RQ_IN_FLIGHT) {
>      > +             if (op_is_write(cmd_flags))
>      > +                     iter->dio->write++;
>      > +             else
>      > +                     iter->dio->read++;
>      > +     }
>      > +
>      > +     return TRUE;
>      > +}
>      > +
>      > +static bool bt_tags_iter(uint bitnr, void *data)

I missed this, please rename also this to bt_iter, according to the kernel
path that we follow.

Thanks,
Kazu

>      > +{
>      > +     ulong addr = 0, rqs_addr = 0, rq = 0;
>      > +     struct bt_tags_iter_data *tag_iter = data;
>      > +     ulong tag = tag_iter->tags;
>      > +
>      > +     if (!tag_iter->flags)
>      > +             bitnr += tag_iter->nr_reserved_tags;
>      > +
>      > +     /* rqs */
>      > +     addr = tag + OFFSET(blk_mq_tags_rqs);
>      > +     if (!readmem(addr, KVADDR, &rqs_addr, sizeof(void *), "blk_mq_tags.rqs", RETURN_ON_ERROR))
>      > +             return FALSE;
>      > +
>      > +     addr = rqs_addr + bitnr * sizeof(ulong); /* rqs[bitnr] */
>      > +     if (!readmem(addr, KVADDR, &rq, sizeof(ulong), "blk_mq_tags.rqs[]", RETURN_ON_ERROR))
>      > +             return FALSE;
>      > +
>      > +     return tag_iter->fn(rq, tag_iter->data);
>      > +}
>      > +
>      > +static void bt_tags_for_each(ulong q, ulong tags, ulong sbq, uint flags, uint nr_resvd_tags, struct diskio *dio)
> 
>     Please rename this to bt_for_each.
> 
> No problem.
> 
>      > +{
>      > +     struct sbitmap_context sc = {0};
> 
>      > +     struct diskio tmp = {0};
> 
>     This tmp can be removed?
> 
>     (The dio->{read,write} are incremented in mq_check_inflight(), so
>     we don't need the local tmps for each function, I think)
> 
> Let me double check.
> 
>      > +     struct bt_iter_data iter_data = {
>      > +             .q = q,
>      > +             .dio = &tmp,
>      > +     };
>      > +     struct bt_tags_iter_data tags_iter_data = {
>      > +             .tags = tags,
>      > +             .flags = flags,
>      > +             .nr_reserved_tags = nr_resvd_tags,
>      > +             .fn = mq_check_inflight,
>      > +             .data = &iter_data,
>      > +     };
>      > +
>      > +     sbitmap_context_load(sbq + OFFSET(sbitmap_queue_sb), &sc);
>      > +     sbitmap_for_each_set(&sc, bt_tags_iter, &tags_iter_data);
>      > +
>      > +     dio->read = tmp.read;
>      > +     dio->write = tmp.write;
>      > +}
>      > +
>      > +static void queue_for_each_hw_ctx(ulong q, ulong *hctx, uint cnt, struct diskio *dio)
>      > +{
>      > +     uint i;
> 
>      > +     struct diskio tmp = {0};
> 
>     This also can be removed.
> 
>      > +
>      > +     if (!hctx || !dio)
>      > +             error(FATAL, "%s: Invalid parameter.\n", __func__);
> 
>     This can be used?
> 
> Will remove it.
> 
>      > +
>      > +     for (i = 0; i < cnt; i++) {
>      > +             ulong addr = 0, tags = 0;
>      > +             uint nr_reserved_tags = 0;
>      > +
> 
>      > +             if (!IS_KVADDR(hctx[i]))
>      > +                     continue;
> 
>     Is this the remain of the v1 patch?
> 
> 
> Yes, this can be removed from the 'for loop'.
> 
>      > +
>      > +             /* Tags owned by the block driver */
>      > +             addr = hctx[i] + OFFSET(blk_mq_hw_ctx_tags);
>      > +             if (!readmem(addr, KVADDR, &tags, sizeof(ulong),
>      > +                             "blk_mq_hw_ctx.tags", RETURN_ON_ERROR))
>      > +                     break;
>      > +
>      > +             addr = tags + OFFSET(blk_mq_tags_nr_reserved_tags);
>      > +             if (!readmem(addr, KVADDR, &nr_reserved_tags, sizeof(uint),
>      > +                             "blk_mq_tags_nr_reserved_tags", RETURN_ON_ERROR))
>      > +                     break;
>      > +
>      > +             if (nr_reserved_tags) {
>      > +                     addr = tags + OFFSET(blk_mq_tags_breserved_tags);
>      > +                     bt_tags_for_each(q, tags, addr, 1, nr_reserved_tags, &tmp);
>      > +             }
>      > +             addr = tags + OFFSET(blk_mq_tags_bitmap_tags);
>      > +             bt_tags_for_each(q, tags, addr, 0, nr_reserved_tags, &tmp);
> 
>     (the local tmp set by the nr_reserved_tags case is overwritten here.)
> 
> Thanks for pointing out this issue.  It should be accumulated in the bt_tags_for_each() as below:
> +       dio->read += tmp.read;
> +       dio->write += tmp.write;
> 
> But anyway, I will rethink the variable 'tmp' and see what is the good way.
> 
> Thanks.
> Lianbo
> 
>      > +     }
>      > +
>      > +     dio->read = tmp.read;
>      > +     dio->write = tmp.write;
>      > +}
>      > +
>      > +static void get_mq_diskio_from_hw_queues(ulong q, struct diskio *dio)
>      > +{
>      > +     uint cnt = 0;
>      > +     ulong addr = 0, hctx_addr = 0;
>      > +     ulong *hctx_array = NULL;
> 
>      > +     struct diskio tmp = {0};
> 
>     This also can be removed.
> 
> Ditto.
> 
>      > +
>      > +     addr = q + OFFSET(request_queue_nr_hw_queues);
>      > +     readmem(addr, KVADDR, &cnt, sizeof(uint),
>      > +             "request_queue.nr_hw_queues", FAULT_ON_ERROR);
>      > +
>      > +     addr = q + OFFSET(request_queue_queue_hw_ctx);
>      > +     readmem(addr, KVADDR, &hctx_addr, sizeof(void *),
>      > +             "request_queue.queue_hw_ctx", FAULT_ON_ERROR);
>      > +
>      > +     hctx_array = (ulong *)GETBUF(sizeof(void *) * cnt);
>      > +     if (!hctx_array)
>      > +             error(FATAL, "fail to get memory for the hctx_array\n");
>      > +
>      > +     if (!readmem(hctx_addr, KVADDR, hctx_array, sizeof(void *) * cnt,
>      > +                     "request_queue.queue_hw_ctx[]", RETURN_ON_ERROR)) {
>      > +             FREEBUF(hctx_array);
>      > +             return;
>      > +     }
>      > +
>      > +     queue_for_each_hw_ctx(q, hctx_array, cnt, &tmp);
>      > +     dio->read = tmp.read;
>      > +     dio->write = tmp.write;
>      > +
>      > +     FREEBUF(hctx_array);
>      > +}
>      > +
>      >   static void
>      >   get_mq_diskio(unsigned long q, unsigned long *mq_count)
>      >   {
>      >       int cpu;
>      >       unsigned long queue_ctx;
>      >       unsigned long mctx_addr;
>      > -     struct diskio tmp;
>      > +     struct diskio tmp = {0};
>      >
>      >       if (INVALID_MEMBER(blk_mq_ctx_rq_dispatched) ||
>      > -         INVALID_MEMBER(blk_mq_ctx_rq_completed))
>      > +         INVALID_MEMBER(blk_mq_ctx_rq_completed)) {
>      > +             get_mq_diskio_from_hw_queues(q, &tmp);
>      > +             mq_count[0] = tmp.read;
>      > +             mq_count[1] = tmp.write;
>      >               return;
>      > -
>      > -     memset(&tmp, 0x00, sizeof(struct diskio));
>      > +     }
>      >
>      >       readmem(q + OFFSET(request_queue_queue_ctx), KVADDR, &queue_ctx,
>      >               sizeof(ulong), "request_queue.queue_ctx",
>      > @@ -4479,41 +4653,24 @@ display_one_diskio(struct iter *i, unsigned long gendisk, ulong flags)
>      >               && (io.read + io.write == 0))
>      >               return;
>      >
>      > -     if (use_mq_interface(queue_addr) &&
>      > -         (INVALID_MEMBER(blk_mq_ctx_rq_dispatched) ||
>      > -          INVALID_MEMBER(blk_mq_ctx_rq_completed)))
>      > -             fprintf(fp, "%s%s%s  %s%s%s%s  %s%s%s",
>      > -                     mkstring(buf0, 5, RJUST|INT_DEC, (char *)(unsigned long)major),
>      > -                     space(MINSPACE),
>      > -                     mkstring(buf1, VADDR_PRLEN, LJUST|LONG_HEX, (char *)gendisk),
>      > -                     space(MINSPACE),
>      > -                     mkstring(buf2, 10, LJUST, disk_name),
>      > -                     space(MINSPACE),
>      > -                     mkstring(buf3, VADDR_PRLEN <= 11 ? 11 : VADDR_PRLEN,
>      > -                              LJUST|LONG_HEX, (char *)queue_addr),
>      > -                     space(MINSPACE),
>      > -                     mkstring(buf4, 17, RJUST, "(not supported)"),
>      > -                     space(MINSPACE));
>      > -
>      > -     else
>      > -             fprintf(fp, "%s%s%s  %s%s%s%s  %s%5d%s%s%s%s%s",
>      > -                     mkstring(buf0, 5, RJUST|INT_DEC, (char *)(unsigned long)major),
>      > -                     space(MINSPACE),
>      > -                     mkstring(buf1, VADDR_PRLEN, LJUST|LONG_HEX, (char *)gendisk),
>      > -                     space(MINSPACE),
>      > -                     mkstring(buf2, 10, LJUST, disk_name),
>      > -                     space(MINSPACE),
>      > -                     mkstring(buf3, VADDR_PRLEN <= 11 ? 11 : VADDR_PRLEN,
>      > -                              LJUST|LONG_HEX, (char *)queue_addr),
>      > -                     space(MINSPACE),
>      > -                     io.read + io.write,
>      > -                     space(MINSPACE),
>      > -                     mkstring(buf4, 5, RJUST|INT_DEC,
>      > -                             (char *)(unsigned long)io.read),
>      > -                     space(MINSPACE),
>      > -                     mkstring(buf5, 5, RJUST|INT_DEC,
>      > -                             (char *)(unsigned long)io.write),
>      > -                     space(MINSPACE));
>      > +     fprintf(fp, "%s%s%s  %s%s%s%s  %s%5d%s%s%s%s%s",
>      > +             mkstring(buf0, 5, RJUST|INT_DEC, (char *)(unsigned long)major),
>      > +             space(MINSPACE),
>      > +             mkstring(buf1, VADDR_PRLEN, LJUST|LONG_HEX, (char *)gendisk),
>      > +             space(MINSPACE),
>      > +             mkstring(buf2, 10, LJUST, disk_name),
>      > +             space(MINSPACE),
>      > +             mkstring(buf3, VADDR_PRLEN <= 11 ? 11 : VADDR_PRLEN,
>      > +                      LJUST|LONG_HEX, (char *)queue_addr),
>      > +             space(MINSPACE),
>      > +             io.read + io.write,
>      > +             space(MINSPACE),
>      > +             mkstring(buf4, 5, RJUST|INT_DEC,
>      > +                     (char *)(unsigned long)io.read),
>      > +             space(MINSPACE),
>      > +             mkstring(buf5, 5, RJUST|INT_DEC,
>      > +                     (char *)(unsigned long)io.write),
>      > +             space(MINSPACE));
>      >
>      >       if (VALID_MEMBER(request_queue_in_flight)) {
>      >               if (!use_mq_interface(queue_addr)) {
>      > @@ -4597,6 +4754,9 @@ void diskio_init(void)
>      >       MEMBER_OFFSET_INIT(kobject_entry, "kobject", "entry");
>      >       MEMBER_OFFSET_INIT(kset_list, "kset", "list");
>      >       MEMBER_OFFSET_INIT(request_list_count, "request_list", "count");
>      > +     MEMBER_OFFSET_INIT(request_cmd_flags, "request", "cmd_flags");
>      > +     MEMBER_OFFSET_INIT(request_q, "request", "q");
>      > +     MEMBER_OFFSET_INIT(request_state, "request", "state");
>      >       MEMBER_OFFSET_INIT(request_queue_in_flight, "request_queue",
>      >               "in_flight");
>      >       if (MEMBER_EXISTS("request_queue", "rq"))
>      > @@ -4608,10 +4768,33 @@ void diskio_init(void)
>      >                       "mq_ops");
>      >               ANON_MEMBER_OFFSET_INIT(request_queue_queue_ctx,
>      >                       "request_queue", "queue_ctx");
>      > +             MEMBER_OFFSET_INIT(request_queue_queue_hw_ctx,
>      > +                     "request_queue", "queue_hw_ctx");
>      > +             MEMBER_OFFSET_INIT(request_queue_nr_hw_queues,
>      > +                     "request_queue", "nr_hw_queues");
>      >               MEMBER_OFFSET_INIT(blk_mq_ctx_rq_dispatched, "blk_mq_ctx",
>      >                       "rq_dispatched");
>      >               MEMBER_OFFSET_INIT(blk_mq_ctx_rq_completed, "blk_mq_ctx",
>      >                       "rq_completed");
>      > +             MEMBER_OFFSET_INIT(blk_mq_hw_ctx_tags, "blk_mq_hw_ctx", "tags");
>      > +             MEMBER_OFFSET_INIT(blk_mq_tags_bitmap_tags, "blk_mq_tags",
>      > +                     "bitmap_tags");
>      > +             MEMBER_OFFSET_INIT(blk_mq_tags_breserved_tags, "blk_mq_tags",
>      > +                     "breserved_tags");
>      > +             MEMBER_OFFSET_INIT(blk_mq_tags_nr_reserved_tags, "blk_mq_tags",
>      > +                     "nr_reserved_tags");
>      > +             MEMBER_OFFSET_INIT(blk_mq_tags_rqs, "blk_mq_tags", "rqs");
>      > +             STRUCT_SIZE_INIT(blk_mq_tags, "blk_mq_tags");
>      > +             STRUCT_SIZE_INIT(sbitmap, "sbitmap");
>      > +             STRUCT_SIZE_INIT(sbitmap_word, "sbitmap_word");
>      > +             MEMBER_OFFSET_INIT(sbitmap_word_word, "sbitmap_word", "word");
>      > +             MEMBER_OFFSET_INIT(sbitmap_word_cleared, "sbitmap_word", "cleared");
>      > +             MEMBER_OFFSET_INIT(sbitmap_depth, "sbitmap", "depth");
>      > +             MEMBER_OFFSET_INIT(sbitmap_shift, "sbitmap", "shift");
>      > +             MEMBER_OFFSET_INIT(sbitmap_map_nr, "sbitmap", "map_nr");
>      > +             MEMBER_OFFSET_INIT(sbitmap_map, "sbitmap", "map");
>      > +             MEMBER_OFFSET_INIT(sbitmap_queue_sb, "sbitmap_queue", "sb");
>      > +
>      >       }
>      >       MEMBER_OFFSET_INIT(subsys_private_klist_devices, "subsys_private",
>      >               "klist_devices");
>      > diff --git a/symbols.c b/symbols.c
>      > index 5d12a021c769..c1f09556d710 100644
>      > --- a/symbols.c
>      > +++ b/symbols.c
>      > @@ -10385,6 +10385,12 @@ dump_offset_table(char *spec, ulong makestruct)
>      >               OFFSET(kset_list));
>      >       fprintf(fp, "            request_list_count: %ld\n",
>      >               OFFSET(request_list_count));
>      > +     fprintf(fp, "             request_cmd_flags: %ld\n",
>      > +             OFFSET(request_cmd_flags));
>      > +     fprintf(fp, "                     request_q: %ld\n",
>      > +             OFFSET(request_q));
>      > +     fprintf(fp, "                 request_state: %ld\n",
>      > +             OFFSET(request_state));
>      >       fprintf(fp, "       request_queue_in_flight: %ld\n",
>      >               OFFSET(request_queue_in_flight));
>      >       fprintf(fp, "              request_queue_rq: %ld\n",
>      > @@ -10393,10 +10399,25 @@ dump_offset_table(char *spec, ulong makestruct)
>      >               OFFSET(request_queue_mq_ops));
>      >       fprintf(fp, "       request_queue_queue_ctx: %ld\n",
>      >               OFFSET(request_queue_queue_ctx));
>      > +     fprintf(fp, "    request_queue_queue_hw_ctx: %ld\n",
>      > +             OFFSET(request_queue_queue_hw_ctx));
>      > +     fprintf(fp, "    request_queue_nr_hw_queues: %ld\n",
>      > +             OFFSET(request_queue_nr_hw_queues));
>      >       fprintf(fp, "      blk_mq_ctx_rq_dispatched: %ld\n",
>      >               OFFSET(blk_mq_ctx_rq_dispatched));
>      >       fprintf(fp, "       blk_mq_ctx_rq_completed: %ld\n",
>      >               OFFSET(blk_mq_ctx_rq_completed));
>      > +     fprintf(fp, "            blk_mq_hw_ctx_tags: %ld\n",
>      > +             OFFSET(blk_mq_hw_ctx_tags));
>      > +     fprintf(fp, "       blk_mq_tags_bitmap_tags: %ld\n",
>      > +             OFFSET(blk_mq_tags_bitmap_tags));
>      > +     fprintf(fp, "    blk_mq_tags_breserved_tags: %ld\n",
>      > +             OFFSET(blk_mq_tags_breserved_tags));
>      > +     fprintf(fp, "  blk_mq_tags_nr_reserved_tags: %ld\n",
>      > +             OFFSET(blk_mq_tags_nr_reserved_tags));
>      > +     fprintf(fp, "               blk_mq_tags_rqs: %ld\n",
>      > +             OFFSET(blk_mq_tags_rqs));
> 
>     Good, thanks for adjusting these indents.
> 
>     Thanks,
>     Kazu
> 
>      > +
>      >       fprintf(fp, "  subsys_private_klist_devices: %ld\n",
>      >               OFFSET(subsys_private_klist_devices));
>      >       fprintf(fp, "                subsystem_kset: %ld\n",
>      > @@ -11003,6 +11024,7 @@ dump_offset_table(char *spec, ulong makestruct)
>      >       fprintf(fp, "                       sbitmap: %ld\n", SIZE(sbitmap));
>      >       fprintf(fp, "                 sbitmap_queue: %ld\n", SIZE(sbitmap_queue));
>      >       fprintf(fp, "                sbq_wait_state: %ld\n", SIZE(sbq_wait_state));
>      > +     fprintf(fp, "                   blk_mq_tags: %ld\n", SIZE(blk_mq_tags));
>      >
>      >           fprintf(fp, "\n                   array_table:\n");
>      >       /*
> 
--
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