Hello Masayoshi, I moved the new offset_table entries to the end of the structure to prevent any pre-existing extension modules from breaking, and I added their offsets to the dump_offset_table() function for "help -o".

Queued for crash-7.1.6: https://github.com/crash-utility/crash/commit/df08978f31ba39e94b3096804f4... Thanks, Dave ----- Original Message ----- > Improvement -d option of dev command to display I/O statics > for the disk which the device driver uses blk-mq interface. > > Current dev -d displays always 0 in the all fields for the > blk-mq disk because blk-mq does not increment/decrement to > request_list.count[2] on I/O creation and I/O completion. > > The following value is used in blk-mq on such situation. > > - I/O creation: blk_mq_ctx.rq_dispatched[2] > - I/O completion: blk_mq_ctx.rq_completed[2] > > So, we can get the counter of in progress I/Os as follows. > > in progress I/Os == rq_dispatched - rq_completed > > This patch displays the result of above calculation for the > disk. It judges as the device driver uses blk-mq if the > request_queue.mq_ops is not NULL. > > "DRV" field is displayed as "N/A(MQ)" because the value for in-flight > in the device driver is not exists for blk-mq... > > Signed-off-by: Masayoshi Mizuma <m.mizuma(a)jp.fujitsu.com&gt; > --- > defs.h | 4 +++ > dev.c | 98 > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------ > help.c | 4 ++- > 3 files changed, 96 insertions(+), 10 deletions(-) > > diff --git a/defs.h b/defs.h > index a09fa9a..55c28c5 100755 > --- a/defs.h > +++ b/defs.h > @@ -1822,6 +1822,10 @@ struct offset_table { /* stash of > commonly-used offsets */ > long request_list_count; > long request_queue_in_flight; > long request_queue_rq; > + long request_queue_mq_ops; > + long request_queue_queue_ctx; > + long blk_mq_ctx_rq_dispatched; > + long blk_mq_ctx_rq_completed; > long subsys_private_klist_devices; > long subsystem_kset; > long mount_mnt_parent; > diff --git a/dev.c b/dev.c > index c18f40e..e46081e 100644 > --- a/dev.c > +++ b/dev.c > @@ -3800,18 +3800,84 @@ again: > return i->get_gendisk(klist_node_address); > } > > +static int > +use_mq_interface(unsigned long q) > +{ > + unsigned long mq_ops; > + > + if (!VALID_MEMBER(request_queue_mq_ops)) > + return 0; > + > + readmem(q + OFFSET(request_queue_mq_ops), KVADDR, &mq_ops, > + sizeof(ulong), "request_queue.mq_ops", FAULT_ON_ERROR); > + > + if (mq_ops == 0) > + return 0; > + else > + return 1; > +} > + > +static void > +get_one_mctx_diskio(unsigned long mctx, struct diskio *io) > +{ > + unsigned long dispatch[2]; > + unsigned long comp[2]; > + > + readmem(mctx + OFFSET(blk_mq_ctx_rq_dispatched), > + KVADDR, dispatch, sizeof(ulong) * 2, "blk_mq_ctx.rq_dispatched", > + FAULT_ON_ERROR); > + > + readmem(mctx + OFFSET(blk_mq_ctx_rq_completed), > + KVADDR, comp, sizeof(ulong) * 2, "blk_mq_ctx.rq_completed", > + FAULT_ON_ERROR); > + > + io->read = (dispatch[0] - comp[0]); > + io->write = (dispatch[1] - comp[1]); > +} > + > +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; > + > + memset(&tmp, 0x00, sizeof(struct diskio)); > + > + readmem(q + OFFSET(request_queue_queue_ctx), KVADDR, &queue_ctx, > + sizeof(ulong), "request_queue.queue_ctx", > + FAULT_ON_ERROR); > + > + for (cpu = 0; cpu < kt->cpus; cpu++) { > + if ((kt->flags & SMP) && (kt->flags & PER_CPU_OFF)) { > + mctx_addr = queue_ctx + kt->__per_cpu_offset[cpu]; > + get_one_mctx_diskio(mctx_addr, &tmp); > + mq_count[0] += tmp.read; > + mq_count[1] += tmp.write; > + } > + } > +} > + > /* read request_queue.rq.count[2] */ > static void > get_diskio_1(unsigned long rq, struct diskio *io) > { > int count[2]; > + unsigned long mq_count[2] = { 0 }; > > - readmem(rq + OFFSET(request_queue_rq) + OFFSET(request_list_count), > - KVADDR, count, sizeof(int) * 2, "request_list.count", > - FAULT_ON_ERROR); > + if (!use_mq_interface(rq)) { > + readmem(rq + OFFSET(request_queue_rq) + > + OFFSET(request_list_count), KVADDR, count, > + sizeof(int) * 2, "request_list.count", FAULT_ON_ERROR); > > - io->read = count[0]; > - io->write = count[1]; > + io->read = count[0]; > + io->write = count[1]; > + } else { > + get_mq_diskio(rq, mq_count); > + io->read = mq_count[0]; > + io->write = mq_count[1]; > + } > } > > /* request_queue.in_flight contains total requests */ > @@ -3961,9 +4027,8 @@ display_one_diskio(struct iter *i, unsigned long > gendisk) > readmem(gendisk + OFFSET(gendisk_major), KVADDR, &major, sizeof(int), > "gen_disk.major", FAULT_ON_ERROR); > i->get_diskio(queue_addr, &io); > - in_flight = i->get_in_flight(queue_addr); > > - fprintf(fp, "%s%s%s %s%s%s%s %s%5d%s%s%s%s%s%5u\n", > + 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), > @@ -3980,8 +4045,13 @@ display_one_diskio(struct iter *i, unsigned long > gendisk) > space(MINSPACE), > mkstring(buf5, 5, RJUST|INT_DEC, > (char *)(unsigned long)io.write), > - space(MINSPACE), > - in_flight); > + space(MINSPACE)); > + > + if (!use_mq_interface(queue_addr)) { > + in_flight = i->get_in_flight(queue_addr); > + fprintf(fp, "%5u\n", in_flight); > + } else > + fprintf(fp, "%s\n", "N/A(MQ)"); > } > > static void > @@ -4056,6 +4126,16 @@ void diskio_init(void) > MEMBER_OFFSET_INIT(request_queue_rq, "request_queue", "rq"); > else > MEMBER_OFFSET_INIT(request_queue_rq, "request_queue", "root_rl"); > + if (MEMBER_EXISTS("request_queue", "mq_ops")) { > + MEMBER_OFFSET_INIT(request_queue_mq_ops, "request_queue", > + "mq_ops"); > + ANON_MEMBER_OFFSET_INIT(request_queue_queue_ctx, > + "request_queue", "queue_ctx"); > + 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(subsys_private_klist_devices, "subsys_private", > "klist_devices"); > MEMBER_OFFSET_INIT(subsystem_kset, "subsystem", "kset"); > diff --git a/help.c b/help.c > index 938251f..cfa0516 100644 > --- a/help.c > +++ b/help.c > @@ -2684,7 +2684,9 @@ char *help_dev[] = { > " ASYNC: I/O requests that are asynchronous", > " READ: I/O requests that are reads (older kernels)", > " WRITE: I/O requests that are writes (older kernels)", > -" DRV: I/O requests that are in-flight in the device driver", > +" DRV: I/O requests that are in-flight in the device driver.", > +" If the device driver uses blk-mq interface, this field", > +" shows N/A(MQ).", > "\nEXAMPLES", > " Display character and block device data:\n", > " %s> dev", > -- > 1.8.3.1 > > -- > Crash-utility mailing list > Crash-utility(a)redhat.com > https://www.redhat.com/mailman/listinfo/crash-utility > -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility