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| author | Kemeng Shi <[email protected]> | 2022-12-05 19:57:02 +0800 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2022-12-05 13:44:27 -0700 |
| commit | 84aca0a7e039c8735abc0f89f3f48e9006c0dfc7 (patch) | |
| tree | 2c558db44b8ff430c08d41a8f92f3789e7eb99d6 /tools/perf/scripts/python/event_analyzing_sample.py | |
| parent | f56019aef353576f43f945fdd065858145090582 (diff) | |
blk-throttle: Fix that bps of child could exceed bps limited in parent
Consider situation as following (on the default hierarchy):
HDD
|
root (bps limit: 4k)
|
child (bps limit :8k)
|
fio bs=8k
Rate of fio is supposed to be 4k, but result is 8k. Reason is as
following:
Size of single IO from fio is larger than bytes allowed in one
throtl_slice in child, so IOs are always queued in child group first.
When queued IOs in child are dispatched to parent group, BIO_BPS_THROTTLED
is set and these IOs will not be limited by tg_within_bps_limit anymore.
Fix this by only set BIO_BPS_THROTTLED when the bio traversed the entire
tree.
There patch has no influence on situation which is not on the default
hierarchy as each group is a single root group without parent.
Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Kemeng Shi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/event_analyzing_sample.py')
0 files changed, 0 insertions, 0 deletions