From: Nick Alcock <nick.alcock@oracle.com>
To: Kris Van Hees <kris.van.hees@oracle.com>
Cc: dtrace@lists.linux.dev, dtrace-devel@oss.oracle.com
Subject: Re: [PATCH] Free the DIFO for a probe once it is loaded
Date: Fri, 25 Jul 2025 19:39:51 +0100 [thread overview]
Message-ID: <87o6t83yiw.fsf@esperi.org.uk> (raw)
In-Reply-To: <SJ0PR10MB5672176142BF978BF54B249AC259A@SJ0PR10MB5672.namprd10.prod.outlook.com> (Kris Van Hees's message of "Fri, 25 Jul 2025 00:01:56 -0400")
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.
> +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?
next prev parent reply other threads:[~2025-07-25 18:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-25 4:01 [PATCH] Free the DIFO for a probe once it is loaded Kris Van Hees
2025-07-25 18:39 ` Nick Alcock [this message]
2025-07-25 18:55 ` Kris Van Hees
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