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block/nvme: Add driver statistics for access alignment and hw errors 

Keep statistics of some hardware errors, and number of
aligned/unaligned I/O accesses.

QMP example booting a full RHEL 8.3 aarch64 guest:

{ "execute": "query-blockstats" }
{
    "return": [
        {
            "device": "",
            "node-name": "drive0",
            "stats": {
                "flush_total_time_ns": 6026948,
                "wr_highest_offset": 3383991230464,
                "wr_total_time_ns": 807450995,
                "failed_wr_operations": 0,
                "failed_rd_operations": 0,
                "wr_merged": 3,
                "wr_bytes": 50133504,
                "failed_unmap_operations": 0,
                "failed_flush_operations": 0,
                "account_invalid": false,
                "rd_total_time_ns": 1846979900,
                "flush_operations": 130,
                "wr_operations": 659,
                "rd_merged": 1192,
                "rd_bytes": 218244096,
                "account_failed": false,
                "idle_time_ns": 2678641497,
                "rd_operations": 7406,
            },
            "driver-specific": {
                "driver": "nvme",
                "completion-errors": 0,
                "unaligned-accesses": 2959,
                "aligned-accesses": 4477
            },
            "qdev": "/machine/peripheral-anon/device[0]/virtio-backend"
        }
    ]
}

Suggested-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-id: 20201001162939.1567915-1-philmd@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
master
Philippe Mathieu-Daudé 2020-10-01 18:29:39 +02:00 committed by Stefan Hajnoczi
parent 4c5b97bfd0
commit f25e7ab2b0
2 changed files with 50 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
block/nvme.c
View File

@ -128,6 +128,12 @@ struct BDRVNVMeState {
/* PCI address (required for nvme_refresh_filename()) */
char *device;
struct {
uint64_t completion_errors;
uint64_t aligned_accesses;
uint64_t unaligned_accesses;
} stats;
};
#define NVME_BLOCK_OPT_DEVICE "device"
@ -384,6 +390,9 @@ static bool nvme_process_completion(NVMeQueuePair *q)
break;
}
ret = nvme_translate_error(c);
if (ret) {
s->stats.completion_errors++;
}
q->cq.head = (q->cq.head + 1) % NVME_QUEUE_SIZE;
if (!q->cq.head) {
q->cq_phase = !q->cq_phase;
@ -1155,8 +1164,10 @@ static int nvme_co_prw(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
assert(QEMU_IS_ALIGNED(bytes, s->page_size));
assert(bytes <= s->max_transfer);
if (nvme_qiov_aligned(bs, qiov)) {
s->stats.aligned_accesses++;
return nvme_co_prw_aligned(bs, offset, bytes, qiov, is_write, flags);
}
s->stats.unaligned_accesses++;
trace_nvme_prw_buffered(s, offset, bytes, qiov->niov, is_write);
buf = qemu_try_memalign(s->page_size, bytes);
@ -1452,6 +1463,21 @@ static void nvme_unregister_buf(BlockDriverState *bs, void *host)
qemu_vfio_dma_unmap(s->vfio, host);
}
static BlockStatsSpecific *nvme_get_specific_stats(BlockDriverState *bs)
{
BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1);
BDRVNVMeState *s = bs->opaque;
stats->driver = BLOCKDEV_DRIVER_NVME;
stats->u.nvme = (BlockStatsSpecificNvme) {
.completion_errors = s->stats.completion_errors,
.aligned_accesses = s->stats.aligned_accesses,
.unaligned_accesses = s->stats.unaligned_accesses,
};
return stats;
}
static const char *const nvme_strong_runtime_opts[] = {
NVME_BLOCK_OPT_DEVICE,
NVME_BLOCK_OPT_NAMESPACE,
@ -1485,6 +1511,7 @@ static BlockDriver bdrv_nvme = {
.bdrv_refresh_filename = nvme_refresh_filename,
.bdrv_refresh_limits = nvme_refresh_limits,
.strong_runtime_opts = nvme_strong_runtime_opts,
.bdrv_get_specific_stats = nvme_get_specific_stats,
.bdrv_detach_aio_context = nvme_detach_aio_context,
.bdrv_attach_aio_context = nvme_attach_aio_context,

24
qapi/block-core.json
View File

@ -947,6 +947,27 @@
'discard-nb-failed': 'uint64',
'discard-bytes-ok': 'uint64' } }
##
# @BlockStatsSpecificNvme:
#
# NVMe driver statistics
#
# @completion-errors: The number of completion errors.
#
# @aligned-accesses: The number of aligned accesses performed by
# the driver.
#
# @unaligned-accesses: The number of unaligned accesses performed by
# the driver.
#
# Since: 5.2
##
{ 'struct': 'BlockStatsSpecificNvme',
'data': {
'completion-errors': 'uint64',
'aligned-accesses': 'uint64',
'unaligned-accesses': 'uint64' } }
##
# @BlockStatsSpecific:
#
@ -959,7 +980,8 @@
'discriminator': 'driver',
'data': {
'file': 'BlockStatsSpecificFile',
'host_device': 'BlockStatsSpecificFile' } }
'host_device': 'BlockStatsSpecificFile',
'nvme': 'BlockStatsSpecificNvme' } }
##
# @BlockStats: