Hello Kumar,
On 25. 2. 13. 18:05, Kumar Kartikeya Dwivedi wrote:
On Thu, 13 Feb 2025 at 09:42, Changwoo Min <changwoo@xxxxxxxxxx> wrote:
Hello Song,
Thank you for the review!
On 25. 2. 13. 03:33, Song Liu wrote:
On Wed, Feb 12, 2025 at 12:49 AM Changwoo Min <changwoo@xxxxxxxxxx> wrote:
When there is no entry in the free list (c->free_llist), unit_alloc()
fails even when there is available memory in the system, causing allocation
failure in various BPF calls -- such as bpf_mem_alloc() and
bpf_cpumask_create().
Such allocation failure can happen, especially when a BPF program tries many
allocations -- more than a delta between high and low watermarks -- in an
IRQ-disabled context.
Can we add a selftests for this scenario?
It would be a bit tricky to create an IRQ-disabled case in a BPF
program. However, I think it will be possible to reproduce the
allocation failure issue when allocating sufficiently enough
small allocations.
You can also make use of recently introduced
bpf_local_irq_{save,restore} in the selftest.
Thank you for the suggestion. I will try it out.
Regards,
Changwoo Min
