Date: Fri, 24 Dec 2021 13:34:28 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: freebsd-dtrace@freebsd.org Subject: dtrace: two buffers for ring and fill policies? Message-ID: <a7d2bdd6-15de-7d1a-b7e5-3fd7491cc907@FreeBSD.org>
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I've just noticed that DTrace allocates two per-CPU principal buffers even when
a bufpolicy of ring or fill is used.
I believe that the second buffer is never used in those cases.
This is the code:
if (flags & DTRACEBUF_NOSWITCH)
continue;
if ((buf->dtb_xamot = kmem_zalloc(size,
KM_NOSLEEP | KM_NORMALPRI)) == NULL)
goto err;
As far as I can see, DTRACEBUF_NOSWITCH is not implied by DTRACEBUF_RING or
DTRACEBUF_FILL.
Maybe it should be?
--
Andriy Gapon
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