[DTrace-devel] [PATCH] Free the DIFO for a probe once it is loaded
Kris Van Hees
kris.van.hees at oracle.com
Fri Jul 25 18:55:45 UTC 2025
On Fri, Jul 25, 2025 at 07:39:51PM +0100, Nick Alcock wrote:
> On 25 Jul 2025, Kris Van Hees verbalised:
>
> > When a lot of probes are being probed, keeping all DIFO around consumes
> > a lot of memory. Once the BPF program is loaded, the DIFO can be freed.
>
> DIFO? BPFO, surely :)
>
> ... the attached patch only seems to free anything new on failure, not
> on after-loading.
Oops, yes, will fix and send out a new one.
> > +fail:
> > + dt_difo_free(dtp, prp->difo);
> > + prp->difo = NULL;
> > + return -1;
> [...]
> > +fail:
> > + dt_difo_free(dtp, prp->difo);
> > + prp->difo = NULL;
> > + return 0; // FIXME in dt_bpf_make_progs() this is a fatal error; should we do the same here?
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