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block: New option to define the intervals for collecting I/O statistics

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The BlockAcctStats structure contains a list of BlockAcctTimedStats.
Each one of these collects statistics about the minimum, maximum and
average latencies of all I/O operations in a certain interval of time.

This patch adds a new "stats-intervals" option that allows defining
these intervals.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 41cbcd334a61c6157f0f495cdfd21eff6c156f2a.1446044837.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2015-10-28 17:33:07 +02:00 committed by Kevin Wolf
parent 96e4dedaff
commit 2be5506fc8
2 changed files with 41 additions and 0 deletions
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37
blockdev.c
View file

@ -442,6 +442,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
int bdrv_flags = 0;
int on_read_error, on_write_error;
bool account_invalid, account_failed;
const char *stats_intervals;
BlockBackend *blk;
BlockDriverState *bs;
ThrottleConfig cfg;
@ -481,6 +482,8 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
stats_intervals = qemu_opt_get(opts, "stats-intervals");
extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
&detect_zeroes, &error);
if (error) {
@ -579,6 +582,35 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
}
block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
if (stats_intervals) {
char **intervals = g_strsplit(stats_intervals, ":", 0);
unsigned i;
if (*stats_intervals == '\0') {
error_setg(&error, "stats-intervals can't have an empty value");
}
for (i = 0; !error && intervals[i] != NULL; i++) {
unsigned long long val;
if (parse_uint_full(intervals[i], &val, 10) == 0 &&
val > 0 && val <= UINT_MAX) {
block_acct_add_interval(blk_get_stats(blk), val);
} else {
error_setg(&error, "Invalid interval length: '%s'",
intervals[i]);
}
}
g_strfreev(intervals);
if (error) {
error_propagate(errp, error);
blk_unref(blk);
blk = NULL;
goto err_no_bs_opts;
}
}
}
blk_set_on_error(blk, on_read_error, on_write_error);
@ -3916,6 +3948,11 @@ QemuOptsList qemu_common_drive_opts = {
.type = QEMU_OPT_BOOL,
.help = "whether to account for failed I/O operations "
"in the statistics",
},{
.name = "stats-intervals",
.type = QEMU_OPT_STRING,
.help = "colon-separated list of intervals "
"for collecting I/O statistics, in seconds",
},
{ /* end of list */ }
},

4
qapi/block-core.json
View file

@ -1531,6 +1531,9 @@
# @stats-account-failed: #optional whether to include failed
# operations when computing latency and last
# access statistics (default: true) (Since 2.5)
# @stats-intervals: #optional colon-separated list of intervals for
# collecting I/O statistics, in seconds (default: none)
# (Since 2.5)
# @detect-zeroes: #optional detect and optimize zero writes (Since 2.1)
# (default: off)
#
@ -1548,6 +1551,7 @@
'*read-only': 'bool',
'*stats-account-invalid': 'bool',
'*stats-account-failed': 'bool',
'*stats-intervals': 'str',
'*detect-zeroes': 'BlockdevDetectZeroesOptions' } }
##