diff options
| author | Alberto Garcia <berto@igalia.com> | 2015-10-28 17:33:07 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-11-12 16:22:46 +0100 |
| commit | 2be5506fc85d5fef1abdb2128d446cb0b14b12bc (patch) | |
| tree | ee078635b9ad2b7eabc67cb8a0f9d53a75fb9709 /blockdev.c | |
| parent | 96e4dedaff9922f87e4ec351d51d3f093198382a (diff) | |
block: New option to define the intervals for collecting I/O statistics
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>
Diffstat (limited to 'blockdev.c')
| -rw-r--r-- | blockdev.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/blockdev.c b/blockdev.c index 17029fd6c0..fc85128e94 100644 --- a/blockdev.c +++ b/blockdev.c @@ -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 */ } }, |