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| author | Oleg Nesterov <[email protected]> | 2024-10-01 14:24:59 +0000 |
|---|---|---|
| committer | Peter Zijlstra <[email protected]> | 2024-10-07 07:28:45 +0000 |
| commit | 7a166094bd2b1c084fd215747f9cd05a853d66c9 (patch) | |
| tree | 01da11ab3a925931f2ba3ebd3a7eed3498903853 /tools/testing/selftests/bpf/prog_tests/tcp_custom_syncookie.c | |
| parent | uprobes: deny mremap(xol_vma) (diff) | |
| download | kernel-7a166094bd2b1c084fd215747f9cd05a853d66c9.tar.gz kernel-7a166094bd2b1c084fd215747f9cd05a853d66c9.zip | |
uprobes: kill xol_area->slot_count
Add the new helper, xol_get_slot_nr() which does
find_first_zero_bit() + test_and_set_bit().
xol_take_insn_slot() can wait for the "xol_get_slot_nr() < UINSNS_PER_PAGE"
event instead of "area->slot_count < UINSNS_PER_PAGE".
So we can kill area->slot_count and avoid atomic_inc() + atomic_dec(), this
simplifies the code and can slightly improve the performance.
Signed-off-by: Oleg Nesterov <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/tcp_custom_syncookie.c')
0 files changed, 0 insertions, 0 deletions