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| author | Peter Zijlstra <peterz@infradead.org> | 2023-09-26 14:29:50 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-10-03 12:32:29 +0200 |
| commit | 650cad561cce04b62a8c8e0446b685ef171bc3bb (patch) | |
| tree | 421042af043a1dbb19bf534076439ebe958f86b0 /tools/testing/selftests/bpf/prog_tests/sockmap_basic.c | |
| parent | 2f2fc17bab0011430ceb6f2dc1959e7d1f981444 (diff) | |
sched/eevdf: Fix avg_vruntime()
The expectation is that placing a task at avg_vruntime() makes it
eligible. Turns out there is a corner case where this is not the case.
Specifically, avg_vruntime() relies on the fact that integer division
is a flooring function (eg. it discards the remainder). By this
property the value returned is slightly left of the true average.
However! when the average is a negative (relative to min_vruntime) the
effect is flipped and it becomes a ceil, with the result that the
returned value is just right of the average and thus not eligible.
Fixes: af4cf40470c2 ("sched/fair: Add cfs_rq::avg_vruntime")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/sockmap_basic.c')
0 files changed, 0 insertions, 0 deletions