Re: [RFC/PATCH bpf-next 1/3] bpf: Add kmem_cache iterator

[Alexei Starovoitov]

On Fri, Sep 27, 2024 at 11:41 AM Namhyung Kim <namhyung@xxxxxxxxxx> wrote:
> +static void *kmem_cache_iter_seq_start(struct seq_file *seq, loff_t *pos)
> +{
> +       loff_t cnt = 0;
> +       struct kmem_cache *s = NULL;
> +
> +       mutex_lock(&slab_mutex);

It would be better to find a way to iterate slabs without holding
the mutex for the duration of the loop.
Maybe use refcnt to hold the kmem_cache while bpf prog is looking at it?