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* [Qemu-devel] [PATCH v6 0/9] discard blockstats
@ 2018-11-30 14:47 Anton Nefedov
  2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 1/9] qapi: group BlockDeviceStats fields Anton Nefedov
                   ` (9 more replies)
  0 siblings, 10 replies; 17+ messages in thread
From: Anton Nefedov @ 2018-11-30 14:47 UTC (permalink / raw)
  To: qemu-devel
  Cc: qemu-block, kwolf, mreitz, armbru, jsnow, pbonzini, famz, eblake,
	Denis Lunev, berto, Vladimir Sementsov-Ogievskiy, Anton Nefedov

new in v6:
    - since clauses -> 4.0
    - patch 9: qapi json cosmetic changes as suggested by Vladimir
    - patch 9: proper "driver" field setting for host_device driver

v5: http://lists.nongnu.org/archive/html/qemu-devel/2018-10/msg06828.html
v4: http://lists.nongnu.org/archive/html/qemu-devel/2018-08/msg04308.html
v3: http://lists.nongnu.org/archive/html/qemu-devel/2018-06/msg03688.html

----

qmp query-blockstats provides stats info for write/read/flush ops.

Patches 1-7 implement the similar for discard (unmap) command for scsi
and ide disks.
Discard stat "unmap_ops / unmap_bytes" is supposed to account the ops that
have completed without an error.

However, discard operation is advisory. Specifically,
 - common block layer ignores ENOTSUP error code.
   That might be returned if the block driver does not support discard,
   or discard has been configured to be ignored.
 - format drivers such as qcow2 may ignore discard if they were configured
   to ignore that, or if the corresponding area is already marked unused
   (unallocated / zero clusters).

And what is actually useful is the number of bytes actually discarded
down on the host filesystem.
To achieve that, driver-specific statistics has been added to blockstats
(patch 9).
With patch 8, file-posix driver accounts discard operations on its level too.

query-blockstat result:

(note the difference between blockdevice unmap and file discard stats. qcow2
sends fewer ops down to the file as the clusters are actually unallocated
on qcow2 level)

    {
      "device": "drive-scsi0-0-0-0",
      "node-name": "#block159",
      "stats": {
>       "invalid_unmap_operations": 0,
>       "failed_unmap_operations": 0,
        "wr_highest_offset": 13411688448,
        "rd_total_time_ns": 2859566315,
        "rd_bytes": 103182336,
        "rd_merged": 0,
        "flush_operations": 19,
        "invalid_wr_operations": 0,
        "flush_total_time_ns": 23111608,
        "failed_rd_operations": 0,
        "failed_flush_operations": 0,
        "invalid_flush_operations": 0,
        "timed_stats": [
          
        ],
        "wr_merged": 0,
        "wr_bytes": 1702912,
>       "unmap_bytes": 11954954240,
>       "unmap_operations": 865,
        "idle_time_ns": 2669508623,
        "account_invalid": true,
>       "unmap_total_time_ns": 19698002,
        "wr_operations": 143,
        "failed_wr_operations": 0,
        "rd_operations": 4816,
        "account_failed": true,
>       "unmap_merged": 0,
        "wr_total_time_ns": 1262686124,
        "invalid_rd_operations": 0
      },
      "parent": {
>       "driver-specific": {
>         "discard-nb-failed": 0,
>         "discard-bytes-ok": 720896,
>         "driver": "file",
>         "discard-nb-ok": 8
>       },
        "node-name": "#block009",
        "stats": {
        [..]
        }
      }
    },
    {
      "device": "floppy0",

Anton Nefedov (9):
  qapi: group BlockDeviceStats fields
  qapi: add unmap to BlockDeviceStats
  block: add empty account cookie type
  ide: account UNMAP (TRIM) operations
  scsi: store unmap offset and nb_sectors in request struct
  scsi: move unmap error checking to the complete callback
  scsi: account unmap operations
  file-posix: account discard operations
  qapi: query-blockstat: add driver specific file-posix stats

 qapi/block-core.json       | 81 ++++++++++++++++++++++++++++++++------
 include/block/accounting.h |  2 +
 include/block/block.h      |  1 +
 include/block/block_int.h  |  1 +
 block.c                    |  9 +++++
 block/accounting.c         |  6 +++
 block/file-posix.c         | 60 ++++++++++++++++++++++++++--
 block/qapi.c               | 11 ++++++
 hw/ide/core.c              | 12 ++++++
 hw/scsi/scsi-disk.c        | 32 +++++++++------
 tests/qemu-iotests/227.out | 18 +++++++++
 11 files changed, 208 insertions(+), 25 deletions(-)

-- 
2.17.1

^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2019-02-21 12:41 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-11-30 14:47 [Qemu-devel] [PATCH v6 0/9] discard blockstats Anton Nefedov
2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 1/9] qapi: group BlockDeviceStats fields Anton Nefedov
2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 2/9] qapi: add unmap to BlockDeviceStats Anton Nefedov
2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 3/9] block: add empty account cookie type Anton Nefedov
2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 4/9] ide: account UNMAP (TRIM) operations Anton Nefedov
2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 5/9] scsi: store unmap offset and nb_sectors in request struct Anton Nefedov
2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 6/9] scsi: move unmap error checking to the complete callback Anton Nefedov
2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 7/9] scsi: account unmap operations Anton Nefedov
2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 8/9] file-posix: account discard operations Anton Nefedov
2018-11-30 14:47 ` [Qemu-devel] [PATCH v6 9/9] qapi: query-blockstat: add driver specific file-posix stats Anton Nefedov
2018-12-03 14:24   ` Vladimir Sementsov-Ogievskiy
2018-12-13 12:20   ` Markus Armbruster
2018-12-13 15:20     ` Anton Nefedov
2018-12-13 16:05       ` Markus Armbruster
2019-02-21 12:36       ` Markus Armbruster
2019-01-14 13:16 ` [Qemu-devel] [PATCH v6 0/9] discard blockstats Anton Nefedov
2019-02-21  8:02   ` Anton Nefedov

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