diff options
| author |   Amit Chaudhary <achaudhary@purestorage.com> | 2025-09-26 12:08:22 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-10-23 16:24:32 +0200 |
| commit | 86328f3d9bd4477bd6bf1d52ba92821aaf862291 (patch) | |
| tree | 7b60fd669e21fd9289ca4ede0e85cbf0e396f63e /tools/perf/scripts/python/bin/ssh:/git@git.zx2c4.com | |
| parent | drm/panthor: Ensure MCU is disabled on suspend (diff) | |
nvme-multipath: Skip nr_active increments in RETRY disposition
[ Upstream commit bb642e2d300ee27dcede65cda7ffc47a7047bd69 ]
For queue-depth I/O policy, this patch fixes unbalanced I/Os across
nvme multipaths.
Issue Description:
The RETRY disposition incorrectly increments ns->ctrl->nr_active
counter and reinitializes iostat start-time. In such cases nr_active
counter never goes back to zero until that path disconnects and
reconnects.
Such a path is not chosen for new I/Os if multiple RETRY cases on a given
a path cause its queue-depth counter to be artificially higher compared
to other paths. This leads to unbalanced I/Os across paths.
The patch skips incrementing nr_active if NVME_MPATH_CNT_ACTIVE is already
set. And it skips restarting io stats if NVME_MPATH_IO_STATS is already set.
base-commit: e989a3da2d371a4b6597ee8dee5c72e407b4db7a
Fixes: d4d957b53d91eeb ("nvme-multipath: support io stats on the mpath device")
Signed-off-by: Amit Chaudhary <achaudhary@purestorage.com>
Reviewed-by: Randy Jennings <randyj@purestorage.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/bin/ssh:/git@git.zx2c4.com')
0 files changed, 0 insertions, 0 deletions