Latency threshold is set to 10 seconds following guest request timeout on legacy storage controller.
Signed-off-by: Denis V. Lunev <d...@openvz.org> CC: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> CC: Stefan Hajnoczi <stefa...@redhat.com> CC: Kevin Wolf <kw...@redhat.com> CC: Max Reitz <mre...@redhat.com> --- blockdev.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/blockdev.c b/blockdev.c index 66158d1292..733fdd36da 100644 --- a/blockdev.c +++ b/blockdev.c @@ -622,8 +622,13 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, bs->detect_zeroes = detect_zeroes; + /* + * Set log threshold to 10 seconds. Timeout choosen by observation + * of the guest behavior with legacy storage controllers. Linux + * could remount FS read-only if journal write takes this time. + */ block_acct_setup(blk_get_stats(blk), account_invalid, account_failed, - qemu_opt_get_number(opts, "latency-log-threshold", 0)); + qemu_opt_get_number(opts, "latency-log-threshold", 10000)); if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { blk_unref(blk); -- 2.17.1