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Fix zpool iostat bandwidth/ops calculation 

print_vdev_stats() subtracts the old bandwidth/ops stats from the new stats
to calculate the bandwidth/ops numbers in "zpool iostat".  However when the
TXG numbers change between stats, zpool_refresh_stats() will incorrectly assign
a NULL to the old stats. This causes print_vdev_stats() to use zeroes for
the old bandwidth/ops numbers, resulting in an inaccurate calculation.

This fix allows the calculation to happen even when TXGs change.

Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4387
This commit is contained in:
Tony Hutter 2016-03-02 12:57:06 -08:00 committed by Brian Behlendorf
parent c53fb0113c
commit 272be6834c
1 changed files with 1 additions and 13 deletions
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14
lib/libzfs/libzfs_config.c
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@ -311,22 +311,10 @@ zpool_refresh_stats(zpool_handle_t *zhp, boolean_t *missing)
zhp->zpool_config_size = zc.zc_nvlist_dst_size;
if (zhp->zpool_config != NULL) {
uint64_t oldtxg, newtxg;
verify(nvlist_lookup_uint64(zhp->zpool_config,
ZPOOL_CONFIG_POOL_TXG, &oldtxg) == 0);
verify(nvlist_lookup_uint64(config,
ZPOOL_CONFIG_POOL_TXG, &newtxg) == 0);
if (zhp->zpool_old_config != NULL)
nvlist_free(zhp->zpool_old_config);
if (oldtxg != newtxg) {
nvlist_free(zhp->zpool_config);
zhp->zpool_old_config = NULL;
} else {
zhp->zpool_old_config = zhp->zpool_config;
}
zhp->zpool_old_config = zhp->zpool_config;
}
zhp->zpool_config = config;