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block: add accounting for merged requests 

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Peter Lieven 2015-02-02 14:52:18 +01:00 committed by Kevin Wolf
parent 35f5a49374
commit f4564d53c6
7 changed files with 45 additions and 6 deletions
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2
block.c
View File

@ -4559,6 +4559,8 @@ static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
}
}
block_acct_merge_done(&bs->stats, BLOCK_ACCT_WRITE, num_reqs - outidx - 1);
return outidx + 1;
}

7
block/accounting.c
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@ -54,3 +54,10 @@ void block_acct_highest_sector(BlockAcctStats *stats, int64_t sector_num,
stats->wr_highest_sector = sector_num + nb_sectors - 1;
}
}
void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
int num_requests)
{
assert(type < BLOCK_MAX_IOTYPE);
stats->merged[type] += num_requests;
}

2
block/qapi.c
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@ -335,6 +335,8 @@ static BlockStats *bdrv_query_stats(const BlockDriverState *bs,
s->stats->wr_bytes = bs->stats.nr_bytes[BLOCK_ACCT_WRITE];
s->stats->rd_operations = bs->stats.nr_ops[BLOCK_ACCT_READ];
s->stats->wr_operations = bs->stats.nr_ops[BLOCK_ACCT_WRITE];
s->stats->rd_merged = bs->stats.merged[BLOCK_ACCT_READ];
s->stats->wr_merged = bs->stats.merged[BLOCK_ACCT_WRITE];
s->stats->wr_highest_offset =
bs->stats.wr_highest_sector * BDRV_SECTOR_SIZE;
s->stats->flush_operations = bs->stats.nr_ops[BLOCK_ACCT_FLUSH];

6
hmp.c
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@ -474,6 +474,8 @@ void hmp_info_blockstats(Monitor *mon, const QDict *qdict)
" wr_total_time_ns=%" PRId64
" rd_total_time_ns=%" PRId64
" flush_total_time_ns=%" PRId64
" rd_merged=%" PRId64
" wr_merged=%" PRId64
"\n",
stats->value->stats->rd_bytes,
stats->value->stats->wr_bytes,
@ -482,7 +484,9 @@ void hmp_info_blockstats(Monitor *mon, const QDict *qdict)
stats->value->stats->flush_operations,
stats->value->stats->wr_total_time_ns,
stats->value->stats->rd_total_time_ns,
stats->value->stats->flush_total_time_ns);
stats->value->stats->flush_total_time_ns,
stats->value->stats->rd_merged,
stats->value->stats->wr_merged);
}
qapi_free_BlockStatsList(stats_list);

3
include/block/accounting.h
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@ -39,6 +39,7 @@ typedef struct BlockAcctStats {
uint64_t nr_bytes[BLOCK_MAX_IOTYPE];
uint64_t nr_ops[BLOCK_MAX_IOTYPE];
uint64_t total_time_ns[BLOCK_MAX_IOTYPE];
uint64_t merged[BLOCK_MAX_IOTYPE];
uint64_t wr_highest_sector;
} BlockAcctStats;
@ -53,5 +54,7 @@ void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie);
void block_acct_highest_sector(BlockAcctStats *stats, int64_t sector_num,
unsigned int nb_sectors);
void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
int num_requests);
#endif

9
qapi/block-core.json
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@ -407,13 +407,20 @@
# growable sparse files (like qcow2) that are used on top
# of a physical device.
#
# @rd_merged: Number of read requests that have been merged into another
# request (Since 2.3).
#
# @wr_merged: Number of write requests that have been merged into another
# request (Since 2.3).
#
# Since: 0.14.0
##
{ 'type': 'BlockDeviceStats',
'data': {'rd_bytes': 'int', 'wr_bytes': 'int', 'rd_operations': 'int',
'wr_operations': 'int', 'flush_operations': 'int',
'flush_total_time_ns': 'int', 'wr_total_time_ns': 'int',
'rd_total_time_ns': 'int', 'wr_highest_offset': 'int' } }
'rd_total_time_ns': 'int', 'wr_highest_offset': 'int',
'rd_merged': 'int', 'wr_merged': 'int' } }
##
# @BlockStats:

22
qmp-commands.hx
View File

@ -2303,6 +2303,10 @@ Each json-object contain the following:
- "flush_total_time_ns": total time spend on cache flushes in nano-seconds (json-int)
- "wr_highest_offset": Highest offset of a sector written since the
BlockDriverState has been opened (json-int)
- "rd_merged": number of read requests that have been merged into
another request (json-int)
- "wr_merged": number of write requests that have been merged into
another request (json-int)
- "parent": Contains recursively the statistics of the underlying
protocol (e.g. the host file for a qcow2 image). If there is
no underlying protocol, this field is omitted
@ -2326,6 +2330,8 @@ Example:
"rd_total_times_ns":3465673657
"flush_total_times_ns":49653
"flush_operations":61,
"rd_merged":0,
"wr_merged":0
}
},
"stats":{
@ -2337,7 +2343,9 @@ Example:
"flush_operations":51,
"wr_total_times_ns":313253456
"rd_total_times_ns":3465673657
"flush_total_times_ns":49653
"flush_total_times_ns":49653,
"rd_merged":0,
"wr_merged":0
}
},
{
@ -2351,7 +2359,9 @@ Example:
"flush_operations":0,
"wr_total_times_ns":0
"rd_total_times_ns":0
"flush_total_times_ns":0
"flush_total_times_ns":0,
"rd_merged":0,
"wr_merged":0
}
},
{
@ -2365,7 +2375,9 @@ Example:
"flush_operations":0,
"wr_total_times_ns":0
"rd_total_times_ns":0
"flush_total_times_ns":0
"flush_total_times_ns":0,
"rd_merged":0,
"wr_merged":0
}
},
{
@ -2379,7 +2391,9 @@ Example:
"flush_operations":0,
"wr_total_times_ns":0
"rd_total_times_ns":0
"flush_total_times_ns":0
"flush_total_times_ns":0,
"rd_merged":0,
"wr_merged":0
}
}
]